4 NOAA TR NWS 14

AIUNITED STATES PADEPARTMENTOF

COMMERCE ANOAA Technical Report NWS 14PUBLIT CATo - deg US DEPARTMENT OFZOMMERCE

National Oceanic and Atmospheric Administration National Weather Service

-tAJtt 0

Weekly Synoptic Analyses5-2- and 04-Millibar

Surfaces for 1968

STAFF UPPER AIR BRANCH National Meteorological Center

degq(4 co (ACCESSION NUMBER) (THRU

0 (PAGES) X (OE I9-

U (NASA CR OR TMX OR AD NUMBER) (CATEGORY)

SILVER SPRING MD

May 1971

httpsntrsnasagovsearchjspR=19710027495 2020-06-21T213021+0000Z

NOAA TECHNICAL REPORTS National Weather Service Series

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WB I Monthly Mean 100- 50- 30- and 10-Millibar Charts January 1964 through December 1965 of the IQSY Peshyriod Staff Upper Air Branch National Meteorological Center February 1967 (AD 651 101)

WB 2 Weekly Synoptic Analyses 5- 2- and 04-Mb Surfaces for 1964 (based on observations of the Meteorological Rocket Network during the IQSY) Staff Upper Air Branch National Meteorological Center April 1967 (AD 652 696)

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WB 10 Hemispheric Teleconnections of Mean Circulation Anomalies at 700 Millibars James F OConnor National Meteorological Center February 1969 Price $100

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WB 12 Weekly Synoptic Analyses 5- 2- and 04-MilIibar Surfaces for 1967 (Based on meteorological rooketsonde and high-level rawinsonde observations) Staff Upper Air Branch National Meteorological Center January 1970 Price $150

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NOAA Technical Report NWS 14

Weekly Synoptic Analyses 5- 2- and 04-Millibar Surfaces for 1968 (Based on meteorological rocketsonde and high-level rawinsonde observations)

STAFF UPPER AIR BRANCH National Meteorological Center

SILVER SPRING MD

MAY 101

This repor was repared with suprt t of the National Aeronauticsand-Space Administration under contract P-44664(G)

UDC 55L509215515067551507362 1551508 822 (7) 1968-53 5515 Meteorology

509 Synoptic meteorology 21 Synoptic eharts

506 Periodical observational data 7 Upper air data

507 Instrument carrier 3621 Rockets

-508 Meteorological instruments 822 Radiosondes - Rawinsondes

(7) North America 1968-53 Weekly during 1968

UNITED STATES GOVERNMENT PRINTING OFFICE

WASHINGTON 1971

For sale by the Superintendent of Documnents US Government Printing Office Washington DC 20402 - Price $150

Stock Number 0318-0017

II

Contents PAGE

Introduction --------- ----------------- ------ -------- ----------------- ------ ------ 1

Processing of rawinsonde data ---------------------------------------------------- 1

Processing of rocketsonde data ----------------------------------------------------

Station Model and Reporting Rocket Stations ---------------------------------------- 13

2

Analysis procedure ------------------------------------------------------------- 3

Discussion of the 1968 charts ----------------------------------------------------- 4

Acknowledgments --------------------------------------------------------------- 6

References -------------------------------------------------------------------- 6

Weekly 5- 2- and 04-mb synoptic charts ------------------------------------------- 14169

LIST OF ILLUSTRATIONS

rIGURE

1 Analyzed values from weekly charts at Fort Greely ---------------------------------- 7

2 Analyzed values from weekly charts at Fort Churchill ------------------------------- 8

3 Analyzed values from weekly charts at Wallops Island ------------------------------ 9

4 Analyzed values from weekly charts at White Sands -------------------------------- 10

5 Analyzed values from weekly charts at Antigua ------------------------------------ 11

iii

Weekly Synoptic Analyses 5- 2- and 04-Millibar Surfaces for 1968

(Based on meteorological rocketsonde and high-level rawinsonde observations)

STAFF UPPER AIR BRANCH

National Meteorological Center NOAA Hillcrest Heights Md

ABSTRACT Data from meteorological rocketsonde and rawinsonde observations have been employed to analyze a series of high-altitude synoptic charts Methods employed for processhysing the various types of data and the analysis procedure used are described

Broad-scale analyses of the 5- 2- and 04 mb surfaces primarily covering North America and adjacent ocean areas are presented at weekly intervals for 1968 A brief discussion of the height and temperature fields is also given Circulation and temperature changes associated with a major stratospheric warming during January are among the discussion items

INTRODUCTION

This volume represents the fifth in a series of con-stant-pressure charts for the upper stratosphere based on rocketsonde and very high level rawinsonde data obtained over North America and adjacent ocean areas These charts have been analyzed by the Upper Air Branch of the National Weather Services National Meteorological Center (Staff 1967a 1967b 1969 1970)

At 5 mb both rawinsonde and rocketsonde data were used to derive the height and temperature fields Above 5 mb rawinsonde data were seldom available and rocket observations constituted the basic data source The Station Model and Reporting Rocket Stations chart (p 13) shows the locations of 20 meteorological rocket launch sites within the map analysis area for which data were available -in 1968

The present series of analyses at weekly intervals includes charts for the 5- 2- and 04-mb surfaces (approximately 36 42 and 55 kin respectively) nominally representing broad-scale synoptic conditions

on each Wednesday of the analysis period In addition to a description of the techniques employed in obtainshying these charts a brief discussion of large-scale features is also included

PROCESSING OF RAWINSONDE DATA

The preparation of high-level data for analysis presents many problems Some of the difficulties enshycountered in the use of rawinsonde information such as achieving compatibility between daytime and nightshytime observations extrapolation and interpolation of data and identification of erroneous reports have been summarized previously (Finger et al 1965 1966)

Temperature and height adjustments designed to compensate for instrumental radiation errors were apshyplied to all 5-mb rawinsonde reports Initially an adshyjustment was made which reduced values from daytime observations to the level of those values reported from nighttime observations Magnitudes of these day-night adjustments which are intended to account for the

1

effects of solar heating on the rod thermitor were 2- and 04-mb surfaces was as follows determined with the aid of a computer program that calculated monthly mean differences between reported daylight and darkness values Input to this program consisted of all available 5-mb data for 1964 and 1967 from stations in North America and adjacent ocean areas that employ US outrigger-type radiosonde in-struments (for details of the adjustment and further references see Mclnturff and Finger 1968)

Theoretical and laboratory studies of the rod thermistor used in present-day radiosondes indicated that a significant error may be induced by infrared cooling at stratospheric levels above about 10 mb Therefore a second adjustment (Barr 1966) was added to all reported 5-mb data including observa-tions made actually in darkness and daytime data that had been adjusted for solar-radiation error The magnitude of the temperature correction is a function of reported temperature while the height adjustment varies linearly with the temperature correction

Rawinsonde data utilized for the 5-mb charts were processed by computer methods Inputs to the com-puter program consisted of observations from North America and adjacent oceanareas for 7- 5- 4- and 3-mb levels in the form of punched cards obtained from the National Weather Records Center Output listings included all observations for 1 week at each station Data for levels other than 5 mb were also listed to supply the analyst with as much suppleshymentary information as possible Thermal winds and

corresponding horizontal temperature gradients were computed for the layers from 7 to 5 7 to 4 and 5 to 4 nib

After processing the rawinsonde-derived tempera-ture height wind and thermal wind were plotted on work charts For charts presented in this publication the rawinsonde data have been omitted for the sake of legibility

PROCESSING OF ROCKETSONDE DATA

Winds and termperatures measured by rocketsonde systems comprised the basic data sample for analyses at the 2- and 04-mb levels and were also used in combination with rawinsonde data for the 5-mb charts Rocketsonde information was obtained for this proj-ect in the form of magnetic tape identical in format to published information contained in the Meteorolog-ical Rocket Network (MRN) Firings (World Data Center A 1969)

The procedure for extraction of rocketsonde in-formation and for computation of heights of the 5

a Wind and temperature profiles were processed by a computer program designed to reduce the amplitude of rapid oscillations in the vertical by using a simple (1-2-1) smoothing technique This processing was done because analyses are intended to portray only the broad-scale stratoshyspheric features

b Temperatures were modified above 40 km in accordance with Drews (1966) publication one of several theoretical studies (see the review article by Ballard 1967) For the Areasonde IA the instrument most widely employed during 1968 the correction applied to the temperature profiles increased from PdegC at 42 km to about 9degC at 58 km

cAn initial estimate of the geopotential height for each station at the respective pressure levels (5 2 and 04 mb) had to be made before the temperature for that particular level could be

selected This estimate was obtained by deriving the temporal trend of the geopotential height for the station from the lower level analyzed charts and by applying this trend to the geopotential height for the station as shown by the previously analyzed chart The temperature at this estishymated height was then extracted from the ternshyperature profile

d The true geopotential height of the pressure surface at each station was then hydrostatically computed for each available temperature profile This height was obtained by deriving a layershymean temperature between the extracted tershyperature of the upper level and the temperature obtained from the previously completed lower

level analysis Computer-analyzed 10-ob charts (Environmental Science Services Administration 1968) based exclusively on rawinsonde data were used as foundation for hydrostatic compushytation of the height of the 5-mb surface For the 5- and 2-mb levels a constant lapse rate was considered representative However because a temperature maximum (associated with the stratashypause) usually exists between 2 and 04 nib mean temperatures were derived by usifig values exshytracted at each whole kilometer between these two pressure levels

e Wind components were extracted from the smoothed profiles at the height of the constantshypressure surface and a resultant wind was cornshyputed

2

f Thermal winds were determined for 6-kn layers surrounding each pressure surface at the report-ing station

The rooketsonde data (temperature height wind direction and speed and thermal wind) were plotted on work charts On the charts presented for publica-tion three observations are shown when available for each station Heights and thermal winds have been omitted for the sake of legibility The Station Model and Reporting Rocket Stations chart illustrates the symbols used to distinguish the data obtained on Wednesdays from off-time data

ANALYSIS PROCEDURE

Conventional techniques including differential a tnalysistechs construct t -2-m wdnierenused ilanalysis methods were used to construct the 5- 2-

and 04-mb charts H~owever because of the sparsity

of observations data acquired for the entire week were

examined to dtriethe synoptic changes that took petaingplace during the week Thus conditions pertaining

to Wednesday the analysis day were deduced The analysis system consisted of the following

steps

a Isotherms were derived using both processed rocketsonde and rawinsonde temperatures where available In spite of the corrections applied to the 5-mb rawinsonde temperature data large differences could sometimes be seen when corn-paring rocketsonde data that were close in time and distance (Muench 1971) Generally the problem could be resolved by giving greater weight to rawinsonde stations employing hyp-someters In a few cases the difficulty even oc-curred with hypsometer radiosondes therefore some compromise value had to be chosen usu-ally closer to the rocketsonde-reported temper-ature Computed thermal winds were especially useful in determining horizontal temperature gradients and the relative location of warm and cold areas Where possible time-height sections of temperature were plotted as a further aid in deriving the isotherms

bA mean temperature field representative of the layer between the previously analyzed lower sur-face and the selected surface was derived graph-ically This mean field represents a geopotential thi6kness which when added to the lower level height field yields a smooth conservative first approximation to the contour pattern at th6 upper surface

c Reported winds and computed heights for indishyvidual stations were then used to adjust the first approximation of the contour field using the assumption of geostrophic flow Winds were acshycorded the highest priority for this adjustment When large adjustments were made to the conshytour field the temperature field was then adshyjusted to maintain hydrostatic consistency

d The analysis was reviewed for vertical and temshyporal consistency For example circulation censhyters ridges and troughs were examined with the aid of all available data to verify vertical slope and movement with time Time-height secshytions and height-change charts were especially useful for these purposes

The above procedures appear to produce excellent results at 5 mb and were successfully applied to ohshytain the 2- and 04-mb charts Generally only slightadjustments of the first-approximation height fields

were necessa at the 5- and 2-mb levels However

wrtierncsaya h -ad -blvlHwvr rather formidable analysis problems were evident atthe 04-mb level One problem arises from the apparshyent intersection of the stratopause with the 04-mb level Because the normal stratospheric temperature inversion ceases at the stratopause level the graphical method for obtaining mean temperature which deshypends on the existence of a linear profile is no longer valid Large adjustments must be made especially at lower latitudes in the graphically derived height field to conform with the computed height-at each station (as discussed in the previous section)

Another difficulty was the apparent occurrence of large day-to-day temperature changes at times exceedshying 10C (Miller 1969) and persistent oscillations in many wind profiles In most cases deviations of reported temperatures and winds from one another could be accounted for by identifiable rapid largeshyscale synoptic changes Sometimes reports within a few hours of each other at a single station exhibited temperature changes of 5 to 70 C over a limited height interval near the stratopause It has been shown that such small-scale subsynoptie changes are possible at these levels (Miller and Schmidlin 1971) Thus some intermediate value was chosen for analyshy

sis to represent the value on the analysis day Ocshycasionally it was impossible to make a reasonable reconciliation of reported station values

An additional problem is encountered in the sumshymer charts During that season circulation at the upper surfaces (2 and 0 mb) would be expected to follow the pattern established for lower levels that is a rather uniform easterly flow about an anticyclone

3

centered at or very near the North Pole However on- a typical summertime 04-mb chart most reported rocketsonde winds exhibit significant southerly corn-ponents If these winds- were to be given full weight in the analysis the resulting pattern would consist of contours oriented from- southeast to northwest spiraling toward a high center located apparently over northern Europe

The prevalence of positive meridional components in summertime rocketsonde winds has been noted previously (Miers and Beyers 1964) Studies (Reed et al 1966) based on MRN data for several summers have demonstrated that the meridional wind corn-ponent resulting from the diurnal tide reaches maxi-mum southerly strength at about noon local time Because most MRN firings occur near local noon

the measured winds naturally contain this component Although no adjustments were made in individual reports the analysis procedure includes suitable compensation Differences in the reported winds and orientation of the contours may be quite pronounced especially on the summertime charts Strong westerly winds of winter usually mask the weak diurnal com-ponent but there is a possibility that this component may contribute to some bias in analysis during periods of weak circulation

Although careful consideration of high-level data allows a broad-scale depiction of circulation patterns up to 04 rb the -sparsity of reports requires an increasing amount of subjectivity as the analysis pro-ceeds to this high level As yet the analyst has little in the way of synoptic models for guidance with respect to the probable contour and isotherm patterns and the phase relation between these patterns in areas of sparse data The geographical area of analy-sis for the charts has thus been reduced in accordance with the available data The justification for some analyses depends on the interpretation of the limited am6unt of data in such a way as to portray a co-herent sequence of synoptic events In spite of these factors surprisingly little alteration in the principal features of the circulation and temperature distribu-tion shown in the final analysis can be made without inordinately violating spine of the data In general the contours and isotherms -depicted are felt to be good approximations to the flow and temperature patterns at these levels Even so the same degree of accuracy that is found customarily in the analysis of charts at lower levels should not be expected

A contour interval of 320-geopotential meters (gpm) was used throughout- the year In addition

intermediate dashed contours were -used to outline

areas of relatively weak gradient especially during the spring and fall changeover periods Isotherms were drawn and labeled at 5C intervals

DISCUSSION OF THE 1968 CHARTS

The temperature and circulation anomalies assoshyciated with the major stratospheric warming that began in December 1967 (Johnson 1969 Staff 1970) persisted into the beginning of 1968 Maximum temperatures bad been observed at the end of Deshycember with a reversal of the normal wintertime temperature gradient between the North Pole and middle latitudes occurring first at the highest levels then proceeding downward to lower levels Thus at 5 mb on January 3 a wave-two pattern in the isoshytherms and contours was clearly seen with the warm air stretching over the Pole associated with -the two cyclones and with the cold air in the Bering Sea and the Atlantic Ocean associated with the two antishycyclones At 2 nib cold air had returned to the polar area with a warm aiea apparent over western Canada Hydrostatically consistent with this situation was a weakening of the circulation at 2 mb and a disapshypearance of the North Atlantic anticyclone at the 04-mb level with a strong anticyclone apparent in the eastern Pacific The major effects of the stratoshyspheric warming had thus diminished at the upper levels but were propagating downward with time and were still evident at lower altitudes By January 10 anticyclonic circulation dominated the polar reshygion at 5 and 2 mb but at 04 mb the polar cyclone had become reestablished During the next week the transition back to a relatively undisturbed westerly circulation could -be noted at 2 mb and by January 24 this became the pattern at the 5-mb level

During February the polar cyclone intensified at all levels but did not attain the depth reached before the warming The cold air at 5 and 2 mb was someshywhat displaced from the Pole toward northern Canada

- whereas at 04 mb warm air extending from northern Siberia dominated the polar area Although perturbashytions in the temperature fields at high latitudes were noted throughout February and March no significant departures from the basic westerly circulation of the polar vortex were observed The final springtime change from winter to sumshymer conditions could be seen at the end of March at 5 and 2 mrb A warm area was first seen north of Alaska and moved over the polar region In associashytion with the warm area anticyclonic circulation developed in mid-April over the Kamchatka-Alaska

4

region The anticyclonic circulation was displaced northward and an easterly circulation dominated the polar region by the end of April The cyclonic circulation with its associated cold westerlies was displaced southward during May as the polar anti-cyclone intensified and expanded By the end of May the middle and upper stratosphere over the entire Northern Hemisphere was under the influence of sum-mer easterly circulation with the warm air centered at the Pole

The summertime polar anticyclone warmed further during June and gradually intensified Peak tempera-ture and height at the Pole were reached toward the beginning of July with maximum wind reported near subtropical latitudes Thereafter the anticyclone de-cayed slowly as the duration of sunshine decreased in Arctic latitudes Cyclonic circulation formed in the polar area at the end of August and spread as the high latitudes cooled The easterly circulation was displaced southward in the form of cellular ridges reaching low latitudes at the end of September and merging into the subtropical circulation Thus by October westerly circulation predominated over mid-dIe and high latitudes of the Northern Hemisphere stratosphere in low latitudes a variable easterly circulation was associated with fluctuations of the position of the subtropical ridge

During October November and December the polar cyclone deepened accompanied by increasing westerly winds over most of the area However several eastward pulsations of the Aleutian anticy-clone resulted in disturbances of the westerly flow over Alaska and northwestern Canada The anti-cyclone first appeared on November 6 as a weak disturbance at 5 mb over the eastern Pacific By November 20 the anticyclone was found over Alaska at all analysis levels Rapid intensification as well as an eastward movement occurred during the next week affecting the circulation as far east as Fort Churchill Canada After the initial pulse the anti-cyclone retrograded but it persisted although less intense during the rest of December High tempera-

tures were seen during thisperiod in a warm ridge stretching from the Caribbean to southern Europe and across Asia to eastern Siberia This subtropical system sloped northward with height in hydrostatic response to the warm air at higher levels By Decemshyher 18 the warm air at 2 mb over southern Europe exhibited measured temperatures higher than OC At the same time the axis of cold air elongated and split with one center visible ov6r central Canada At the 04-mb level the data indicated a cbnsidershyably disturbed temperature field during the last week of the year with warm air-apparent over the polar region and cold air displaced southward

The principal features of the circulation during 1968 at five representative rocket launch sites may be seen in the time sections (figs 1-5) of analyzed height and temperature values extracted from the weekly charts The annual trend of the height and temperature values is most pronounced at the middleshyand higllatitude stations (figs 1-3) with the largest range of values occurring in the more northerly statiois (Johnson and Gelman 1968) Superimposed on this annual trend characterized by maximum values in summer and minimum values in winter are various perturbations The largest of these perturbashytions was in January and was associated with the major stratospheric warming mentioned above Smaller scale disturbances associated with movements of the Aleutian anticyclone were seen in November and December At the tropical station of Antigua West Indies Associated State (WIAS) the range of values is very small with only very minor perturbashytions affecting the station (fig 5) There is a sugshygestion however of a double maximum at the time of the equinoxes associated with the semiannual variashytion in temperature and wind and related to the seasonal migration of the subtropical anticyclone as seen in the charts At the subtropical station of White Sands N Me (fig 4) a combination of the major annual variation and the semiannual variation is apparent (This discussion prepared by Melvyn E Gelman)

5

ACKNOWLEDGMENTS

Funds for the analysis of the 1968 chart series were provided by the National Aeronautics and Space Administration under contract P 44664 (G)

Personnel actively engaged in the analysis projectwere Project Manager F G Finger Project Analyst

M E Gelman Research Consultant A 1 Miller Data Processing D L Griffith and J A Booth and Computer Operations K W Johnson

Ballard H N A Review of Seven Papers Concern-ing the Measurement of Temperature in the Stratosphere and Mesosphere ECOM 5125 US Army Electronics Command Fort Mon-mouth NJ May 1967 67 pp

Barr W Correctionsof RadiationalError of Radio-sonde Temperature Measurements in the Stratos-pher US Army Electronics Command Fort Monmouth NJ 1966 (personal communication)

Drews W A A Thermistor Arrangement to Im-prove Temperature Measurement at High Alti-tude NASA Contract Report 533 Aug 1966 29 pp

Environmental Science Services Administration Weather Bureau Constant Pressure Charts MF-494 National Weather Records Center Ashe-ville NC 1968

Finger F G Woolf H M and Anderson C E A Method for Objective Analysis of Stratos-pheric Constant-Pressure Charts Monthly Weather Review Vol 93 No 10 Oct 1965 pp 619-638

Finger F_ G Woolf H M and Anderson C E Synoptic Analyses of the 5- 2- and 04-Milli-bar Surfaces for the IQSY Period Monthly Weather Review Vol 94 No 11 Nov 1966 pp 651-661

Johnson K W A Preliminary Study of the Strato-spheric Warming of December 1967- January 1968 Monthly Weather Review Vol 97 No 8 Aug 1969 pp 553-564

Johnson K W and Gelman M E Temperature and Height Variability in the Middle and Upper Stratosphere During 1964-1966 as Determined From Constant Pressure Charts Monthly Weather Review Vol 96 No 6 June 1968 pp 371-382

Mclnturff R M and Finger F G The Compati-bility of Radiosonde Data at Stratospheric Levels

6

Over the Northern Hemisphere ESSA Techshynical Memorandum WBTM DATAC 2 Silver Spring Md Dec 1968 61 pp

Miers B T and Beyers N J Rocketsonde Wind and Temperature Measurements Between 30 and 70 Km for Selected Stations Journalof Applied Meteorolgy Vol 3 No 1 Feb 1964 pp 16-26

Miller A J A Note on the Variability of Ternshyperature as Indicated by Rocletsonde Thermisshytors Journal of Applied Meteorology Vol 8

No 1 Feb 1969 pp 172-174

Miller A J and Schmidlin F J Rocketsonde Repeatability and Stratospheric Variability Journal of Applied Meteorology Vol 10 No 2 April 1971 pp 320-327

Muench H S Temperature Measurements in the 30- to 40-Kilometer Region Monthly Weather Review Vol 99 No 2 Feb 1971 pp 158-160

Reed R J McKenzie D J and Vyverberg J C Diurnal Tidal Motions Between 30 and 60 Kilometers in Summer Journal of the Atmxrsshypheric Sciences Vol 23 No 4 July 1966 pp 416-423

Staff Upper Air Branch National Meteorological Center Weekly Synoptic Analyses 5- 2- and 04-Mb Surfaces for 1964 (Based on Observations of the Meteorological Rocket Network During the IQSY ESSA Technical Report WB 2 Silver Spring Md Apr 1967a 176 pp

Staff Upper Air Branch National Meteorological Center Weekly Synoptic Analyses 5- 2- and 04-Mb Surfaces for 1965 (Based on Observa tions of the Meteorological Rocket Network During the IQSY ESSA Technical Report WB 3 Silver Spring Md Aug 1967b 173 pp

Staff Upper Air Branch National Meteorological Center Weekly Synoptic Analyses 5- 2- and 04-Mb Surfaces for 1966 [Based on Mete orological Rocketsonde and High-Level Rawinshysonde Observations] ESSA Technical Report WB 9 Silver Spring Md Jan 1969 169 pp

Staff Upper Air Branch National Meteorological Center Weekly Synoptic Analyses 5- 2- and 04-Millibar Surfaces for 1967 (Based on Meteshyorological Rocketsonde and High-Level Rawinshysonde Observations) ESSA Technical Report WB 12 Silver Spring Md Jan 1970 169 pp

World Data Center A Meteorology Data Report Meteorological Rocket Network Firings 1968 Vol V National Weather Records Center Asheshyville NC 1969

58

57 H --TEMP X-x

56

55

54

53

52 x-1

51 X X-Xx 04M8BX 3

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3 17 31 14 28 13 27 07 94 8 22 5 19 3 T 31 14 28 11 25 9 23 6 20 4 18 7

JAN 1968 FEB MAR APR 10AY MN JUL AUG SEPT OCT NOV DEC 1968

FIGURE 1-Fort Greely Alaska (64000N 145044W) analyzed values extracted from weekly 5- 2- and 04-mb charts

TEMP x57

56

55

- _S3~~ X--ex- X-x-xxX-x-x-x- -0--^ X-x-xx-x-X x k X- X-XXx

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FEB MAR MAY 1I AVG SEPT OCT NOV DEC 1968

35 17 1142 8MAV 19 2

JAN 1968 _APR_ N

FIGURE 2--ort Churchill Canada (W4deg4N 9349W) analyzed values extracted fromn weekly 5- 2-and 04-rob charts

TEMP x-x

57

54 0

X-X~ 1 X-XXX---- -Xe X X--X -x----NX -20 04MB

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36-1035 -0 -fX--Xx-x-X--X- - Xx-x-X-X-X XXx x shyx- X -x- xx IIIIx- ~x yy X- 30 x-X - Xx x-X-X -x -X x-x-U

IxIIF 1 1T1 1 1 1l I 1 1 l I 1 1 1 1 1 1 I Io X I 1 1 1 1 1 1 I I-fU I 3 1731 4 28 1327 0 24 8 22 19 3 17 31 4 28 125 9 23 6 20 4 8 - dAN 1968 FEB MAR APR MAY JUN JUL AUG SEPT OCT NOV DEC 1968

I FIGURE 3-Walops Island Va (370 50N75 029W) analyzed values extracted from weekly 5 2- and 04-mb charts

NOAA TECHNICAL REPORTS National Weather Service Series

The National Weather Service (NWS) makes observations and measurements of atmospheric

phenomena develops and distributes forecasts of weather conditions and warnings of adverse

weather and collects and dissiminates weather information to meet the needs of the public and specialized users The NIWS develops the national meteorological service system and the improved procedures and techniques for weather and hydrologic measurements and forecasts and for their dissemination

NWS series of NOAA Technical Reports is a continuation of the former series ESSA Techshy

nical Report Weather Bureau (WB)

Reports 1 to 3 are available from the National Technical Information Service US Departshy

ment of Commerce Sills Bldg 5285 Port Royal Road Springfield Va 22151 Price $300 paper copy $095 microfiche Order by accession number when given at end of each entry Beginning

with 4 Reports are available from the Superintendent of Documents US Government Printing

Office Washington DC 20402

ESSA Technical Reports

WB I Monthly Mean 100- 50- 30- and 10-Millibar Charts January 1964 through December 1965 of the IQSY Peshyriod Staff Upper Air Branch National Meteorological Center February 1967 (AD 651 101)

WB 2 Weekly Synoptic Analyses 5- 2- and 04-Mb Surfaces for 1964 (based on observations of the Meteorological Rocket Network during the IQSY) Staff Upper Air Branch National Meteorological Center April 1967 (AD 652 696)

WB 3 Weekly Synoptic Analyses 5- 2- and 04-Mb Surfaces for 1965 (based on observations of the Meteorological Rocket Network during the IQSY) Staff Upper Air Branch National Meteorological Center August 1967 (AD 662 053)

WB 4 The March-May 1965 Floods in the Upper Mississippi Missouri and Red River of the North Basins J L H Paulhus and E R Nelson Office of Hydrology August 1967 Price $060

WB 5 Climatological Probabilities of Precipitation for the Conterminous United States Donald L Jorgensen Techniques Development Laboratory December 1967 Price $040

WB 6 Climatology of Atlantic Tropical Storms and Hurricanes M A Alaka Techniques Development Laboratory May 1968 Price $020

WB 7 Frequency and Areal Distributions of Tropical Storm Rainfall in the United States Coastal Region on the Gulf of Mexico Hugo V Goodyear Office of Hydrology July 1968 Price $035

WB 8 Critical Fire Weather Patterns in the Conterminous United States Mark J Schroeder Office of Meteorshyological Operations January 1969- Price $140

WB 9 Weekly Synoptic Analyses 5- 2- and 04-mb Surfaces for 1966 [Based on meteorological rocketsonde and high-level rawinsonde observations] Staff Upper Air Branch National Meteorological Center January 1969 Price $150

WB 10 Hemispheric Teleconnections of Mean Circulation Anomalies at 700 Millibars James F OConnor National Meteorological Center February 1969 Price $100

WB 11 Monthly Mean 100- 50- 30- and 10-Millibar Charts and Standard Deviation Maps 1966-1967 Staff Upper Air Branch National Meteorological Center April 1969 Price $125

WB 12 Weekly Synoptic Analyses 5- 2- and 04-MilIibar Surfaces for 1967 (Based on meteorological rooketsonde and high-level rawinsonde observations) Staff Upper Air Branch National Meteorological Center January 1970 Price $150

NGAA Technical Reports

NWS 13 The March-April 1969 Snowmelt Floods in the Red River of the North Upper Mississippi and Missouri Basins Joseph L H Paulhus Office of Hydrology October 1970 Price $125

ATMOSPamp US DEPARTMENT OF COMMERCE

__ g Maurice H Stans Secretary NATIONAL OCEANIC AND ATMOSPHERIC ADMINISTRATION

___ _- _ Robert M White Administrator

____

c0 NATIONAL WEATHER SERVICE George P Cressman Director

NOAA Technical Report NWS 14

Weekly Synoptic Analyses 5- 2- and 04-Millibar Surfaces for 1968 (Based on meteorological rocketsonde and high-level rawinsonde observations)

STAFF UPPER AIR BRANCH National Meteorological Center

SILVER SPRING MD

MAY 101

This repor was repared with suprt t of the National Aeronauticsand-Space Administration under contract P-44664(G)

UDC 55L509215515067551507362 1551508 822 (7) 1968-53 5515 Meteorology

509 Synoptic meteorology 21 Synoptic eharts

506 Periodical observational data 7 Upper air data

507 Instrument carrier 3621 Rockets

-508 Meteorological instruments 822 Radiosondes - Rawinsondes

(7) North America 1968-53 Weekly during 1968

UNITED STATES GOVERNMENT PRINTING OFFICE

WASHINGTON 1971

For sale by the Superintendent of Documnents US Government Printing Office Washington DC 20402 - Price $150

Stock Number 0318-0017

II

Contents PAGE

Introduction --------- ----------------- ------ -------- ----------------- ------ ------ 1

Processing of rawinsonde data ---------------------------------------------------- 1

Processing of rocketsonde data ----------------------------------------------------

Station Model and Reporting Rocket Stations ---------------------------------------- 13

2

Analysis procedure ------------------------------------------------------------- 3

Discussion of the 1968 charts ----------------------------------------------------- 4

Acknowledgments --------------------------------------------------------------- 6

References -------------------------------------------------------------------- 6

Weekly 5- 2- and 04-mb synoptic charts ------------------------------------------- 14169

LIST OF ILLUSTRATIONS

rIGURE

1 Analyzed values from weekly charts at Fort Greely ---------------------------------- 7

2 Analyzed values from weekly charts at Fort Churchill ------------------------------- 8

3 Analyzed values from weekly charts at Wallops Island ------------------------------ 9

4 Analyzed values from weekly charts at White Sands -------------------------------- 10

5 Analyzed values from weekly charts at Antigua ------------------------------------ 11

iii

Weekly Synoptic Analyses 5- 2- and 04-Millibar Surfaces for 1968

(Based on meteorological rocketsonde and high-level rawinsonde observations)

STAFF UPPER AIR BRANCH

National Meteorological Center NOAA Hillcrest Heights Md

ABSTRACT Data from meteorological rocketsonde and rawinsonde observations have been employed to analyze a series of high-altitude synoptic charts Methods employed for processhysing the various types of data and the analysis procedure used are described

Broad-scale analyses of the 5- 2- and 04 mb surfaces primarily covering North America and adjacent ocean areas are presented at weekly intervals for 1968 A brief discussion of the height and temperature fields is also given Circulation and temperature changes associated with a major stratospheric warming during January are among the discussion items

INTRODUCTION

This volume represents the fifth in a series of con-stant-pressure charts for the upper stratosphere based on rocketsonde and very high level rawinsonde data obtained over North America and adjacent ocean areas These charts have been analyzed by the Upper Air Branch of the National Weather Services National Meteorological Center (Staff 1967a 1967b 1969 1970)

At 5 mb both rawinsonde and rocketsonde data were used to derive the height and temperature fields Above 5 mb rawinsonde data were seldom available and rocket observations constituted the basic data source The Station Model and Reporting Rocket Stations chart (p 13) shows the locations of 20 meteorological rocket launch sites within the map analysis area for which data were available -in 1968

The present series of analyses at weekly intervals includes charts for the 5- 2- and 04-mb surfaces (approximately 36 42 and 55 kin respectively) nominally representing broad-scale synoptic conditions

on each Wednesday of the analysis period In addition to a description of the techniques employed in obtainshying these charts a brief discussion of large-scale features is also included

PROCESSING OF RAWINSONDE DATA

The preparation of high-level data for analysis presents many problems Some of the difficulties enshycountered in the use of rawinsonde information such as achieving compatibility between daytime and nightshytime observations extrapolation and interpolation of data and identification of erroneous reports have been summarized previously (Finger et al 1965 1966)

Temperature and height adjustments designed to compensate for instrumental radiation errors were apshyplied to all 5-mb rawinsonde reports Initially an adshyjustment was made which reduced values from daytime observations to the level of those values reported from nighttime observations Magnitudes of these day-night adjustments which are intended to account for the

1

effects of solar heating on the rod thermitor were 2- and 04-mb surfaces was as follows determined with the aid of a computer program that calculated monthly mean differences between reported daylight and darkness values Input to this program consisted of all available 5-mb data for 1964 and 1967 from stations in North America and adjacent ocean areas that employ US outrigger-type radiosonde in-struments (for details of the adjustment and further references see Mclnturff and Finger 1968)

Theoretical and laboratory studies of the rod thermistor used in present-day radiosondes indicated that a significant error may be induced by infrared cooling at stratospheric levels above about 10 mb Therefore a second adjustment (Barr 1966) was added to all reported 5-mb data including observa-tions made actually in darkness and daytime data that had been adjusted for solar-radiation error The magnitude of the temperature correction is a function of reported temperature while the height adjustment varies linearly with the temperature correction

Rawinsonde data utilized for the 5-mb charts were processed by computer methods Inputs to the com-puter program consisted of observations from North America and adjacent oceanareas for 7- 5- 4- and 3-mb levels in the form of punched cards obtained from the National Weather Records Center Output listings included all observations for 1 week at each station Data for levels other than 5 mb were also listed to supply the analyst with as much suppleshymentary information as possible Thermal winds and

corresponding horizontal temperature gradients were computed for the layers from 7 to 5 7 to 4 and 5 to 4 nib

After processing the rawinsonde-derived tempera-ture height wind and thermal wind were plotted on work charts For charts presented in this publication the rawinsonde data have been omitted for the sake of legibility

PROCESSING OF ROCKETSONDE DATA

Winds and termperatures measured by rocketsonde systems comprised the basic data sample for analyses at the 2- and 04-mb levels and were also used in combination with rawinsonde data for the 5-mb charts Rocketsonde information was obtained for this proj-ect in the form of magnetic tape identical in format to published information contained in the Meteorolog-ical Rocket Network (MRN) Firings (World Data Center A 1969)

The procedure for extraction of rocketsonde in-formation and for computation of heights of the 5

a Wind and temperature profiles were processed by a computer program designed to reduce the amplitude of rapid oscillations in the vertical by using a simple (1-2-1) smoothing technique This processing was done because analyses are intended to portray only the broad-scale stratoshyspheric features

b Temperatures were modified above 40 km in accordance with Drews (1966) publication one of several theoretical studies (see the review article by Ballard 1967) For the Areasonde IA the instrument most widely employed during 1968 the correction applied to the temperature profiles increased from PdegC at 42 km to about 9degC at 58 km

cAn initial estimate of the geopotential height for each station at the respective pressure levels (5 2 and 04 mb) had to be made before the temperature for that particular level could be

selected This estimate was obtained by deriving the temporal trend of the geopotential height for the station from the lower level analyzed charts and by applying this trend to the geopotential height for the station as shown by the previously analyzed chart The temperature at this estishymated height was then extracted from the ternshyperature profile

d The true geopotential height of the pressure surface at each station was then hydrostatically computed for each available temperature profile This height was obtained by deriving a layershymean temperature between the extracted tershyperature of the upper level and the temperature obtained from the previously completed lower

level analysis Computer-analyzed 10-ob charts (Environmental Science Services Administration 1968) based exclusively on rawinsonde data were used as foundation for hydrostatic compushytation of the height of the 5-mb surface For the 5- and 2-mb levels a constant lapse rate was considered representative However because a temperature maximum (associated with the stratashypause) usually exists between 2 and 04 nib mean temperatures were derived by usifig values exshytracted at each whole kilometer between these two pressure levels

e Wind components were extracted from the smoothed profiles at the height of the constantshypressure surface and a resultant wind was cornshyputed

2

f Thermal winds were determined for 6-kn layers surrounding each pressure surface at the report-ing station

The rooketsonde data (temperature height wind direction and speed and thermal wind) were plotted on work charts On the charts presented for publica-tion three observations are shown when available for each station Heights and thermal winds have been omitted for the sake of legibility The Station Model and Reporting Rocket Stations chart illustrates the symbols used to distinguish the data obtained on Wednesdays from off-time data

ANALYSIS PROCEDURE

Conventional techniques including differential a tnalysistechs construct t -2-m wdnierenused ilanalysis methods were used to construct the 5- 2-

and 04-mb charts H~owever because of the sparsity

of observations data acquired for the entire week were

examined to dtriethe synoptic changes that took petaingplace during the week Thus conditions pertaining

to Wednesday the analysis day were deduced The analysis system consisted of the following

steps

a Isotherms were derived using both processed rocketsonde and rawinsonde temperatures where available In spite of the corrections applied to the 5-mb rawinsonde temperature data large differences could sometimes be seen when corn-paring rocketsonde data that were close in time and distance (Muench 1971) Generally the problem could be resolved by giving greater weight to rawinsonde stations employing hyp-someters In a few cases the difficulty even oc-curred with hypsometer radiosondes therefore some compromise value had to be chosen usu-ally closer to the rocketsonde-reported temper-ature Computed thermal winds were especially useful in determining horizontal temperature gradients and the relative location of warm and cold areas Where possible time-height sections of temperature were plotted as a further aid in deriving the isotherms

bA mean temperature field representative of the layer between the previously analyzed lower sur-face and the selected surface was derived graph-ically This mean field represents a geopotential thi6kness which when added to the lower level height field yields a smooth conservative first approximation to the contour pattern at th6 upper surface

c Reported winds and computed heights for indishyvidual stations were then used to adjust the first approximation of the contour field using the assumption of geostrophic flow Winds were acshycorded the highest priority for this adjustment When large adjustments were made to the conshytour field the temperature field was then adshyjusted to maintain hydrostatic consistency

d The analysis was reviewed for vertical and temshyporal consistency For example circulation censhyters ridges and troughs were examined with the aid of all available data to verify vertical slope and movement with time Time-height secshytions and height-change charts were especially useful for these purposes

The above procedures appear to produce excellent results at 5 mb and were successfully applied to ohshytain the 2- and 04-mb charts Generally only slightadjustments of the first-approximation height fields

were necessa at the 5- and 2-mb levels However

wrtierncsaya h -ad -blvlHwvr rather formidable analysis problems were evident atthe 04-mb level One problem arises from the apparshyent intersection of the stratopause with the 04-mb level Because the normal stratospheric temperature inversion ceases at the stratopause level the graphical method for obtaining mean temperature which deshypends on the existence of a linear profile is no longer valid Large adjustments must be made especially at lower latitudes in the graphically derived height field to conform with the computed height-at each station (as discussed in the previous section)

Another difficulty was the apparent occurrence of large day-to-day temperature changes at times exceedshying 10C (Miller 1969) and persistent oscillations in many wind profiles In most cases deviations of reported temperatures and winds from one another could be accounted for by identifiable rapid largeshyscale synoptic changes Sometimes reports within a few hours of each other at a single station exhibited temperature changes of 5 to 70 C over a limited height interval near the stratopause It has been shown that such small-scale subsynoptie changes are possible at these levels (Miller and Schmidlin 1971) Thus some intermediate value was chosen for analyshy

sis to represent the value on the analysis day Ocshycasionally it was impossible to make a reasonable reconciliation of reported station values

An additional problem is encountered in the sumshymer charts During that season circulation at the upper surfaces (2 and 0 mb) would be expected to follow the pattern established for lower levels that is a rather uniform easterly flow about an anticyclone

3

centered at or very near the North Pole However on- a typical summertime 04-mb chart most reported rocketsonde winds exhibit significant southerly corn-ponents If these winds- were to be given full weight in the analysis the resulting pattern would consist of contours oriented from- southeast to northwest spiraling toward a high center located apparently over northern Europe

The prevalence of positive meridional components in summertime rocketsonde winds has been noted previously (Miers and Beyers 1964) Studies (Reed et al 1966) based on MRN data for several summers have demonstrated that the meridional wind corn-ponent resulting from the diurnal tide reaches maxi-mum southerly strength at about noon local time Because most MRN firings occur near local noon

the measured winds naturally contain this component Although no adjustments were made in individual reports the analysis procedure includes suitable compensation Differences in the reported winds and orientation of the contours may be quite pronounced especially on the summertime charts Strong westerly winds of winter usually mask the weak diurnal com-ponent but there is a possibility that this component may contribute to some bias in analysis during periods of weak circulation

Although careful consideration of high-level data allows a broad-scale depiction of circulation patterns up to 04 rb the -sparsity of reports requires an increasing amount of subjectivity as the analysis pro-ceeds to this high level As yet the analyst has little in the way of synoptic models for guidance with respect to the probable contour and isotherm patterns and the phase relation between these patterns in areas of sparse data The geographical area of analy-sis for the charts has thus been reduced in accordance with the available data The justification for some analyses depends on the interpretation of the limited am6unt of data in such a way as to portray a co-herent sequence of synoptic events In spite of these factors surprisingly little alteration in the principal features of the circulation and temperature distribu-tion shown in the final analysis can be made without inordinately violating spine of the data In general the contours and isotherms -depicted are felt to be good approximations to the flow and temperature patterns at these levels Even so the same degree of accuracy that is found customarily in the analysis of charts at lower levels should not be expected

A contour interval of 320-geopotential meters (gpm) was used throughout- the year In addition

intermediate dashed contours were -used to outline

areas of relatively weak gradient especially during the spring and fall changeover periods Isotherms were drawn and labeled at 5C intervals

DISCUSSION OF THE 1968 CHARTS

The temperature and circulation anomalies assoshyciated with the major stratospheric warming that began in December 1967 (Johnson 1969 Staff 1970) persisted into the beginning of 1968 Maximum temperatures bad been observed at the end of Deshycember with a reversal of the normal wintertime temperature gradient between the North Pole and middle latitudes occurring first at the highest levels then proceeding downward to lower levels Thus at 5 mb on January 3 a wave-two pattern in the isoshytherms and contours was clearly seen with the warm air stretching over the Pole associated with -the two cyclones and with the cold air in the Bering Sea and the Atlantic Ocean associated with the two antishycyclones At 2 nib cold air had returned to the polar area with a warm aiea apparent over western Canada Hydrostatically consistent with this situation was a weakening of the circulation at 2 mb and a disapshypearance of the North Atlantic anticyclone at the 04-mb level with a strong anticyclone apparent in the eastern Pacific The major effects of the stratoshyspheric warming had thus diminished at the upper levels but were propagating downward with time and were still evident at lower altitudes By January 10 anticyclonic circulation dominated the polar reshygion at 5 and 2 mb but at 04 mb the polar cyclone had become reestablished During the next week the transition back to a relatively undisturbed westerly circulation could -be noted at 2 mb and by January 24 this became the pattern at the 5-mb level

During February the polar cyclone intensified at all levels but did not attain the depth reached before the warming The cold air at 5 and 2 mb was someshywhat displaced from the Pole toward northern Canada

- whereas at 04 mb warm air extending from northern Siberia dominated the polar area Although perturbashytions in the temperature fields at high latitudes were noted throughout February and March no significant departures from the basic westerly circulation of the polar vortex were observed The final springtime change from winter to sumshymer conditions could be seen at the end of March at 5 and 2 mrb A warm area was first seen north of Alaska and moved over the polar region In associashytion with the warm area anticyclonic circulation developed in mid-April over the Kamchatka-Alaska

4

region The anticyclonic circulation was displaced northward and an easterly circulation dominated the polar region by the end of April The cyclonic circulation with its associated cold westerlies was displaced southward during May as the polar anti-cyclone intensified and expanded By the end of May the middle and upper stratosphere over the entire Northern Hemisphere was under the influence of sum-mer easterly circulation with the warm air centered at the Pole

The summertime polar anticyclone warmed further during June and gradually intensified Peak tempera-ture and height at the Pole were reached toward the beginning of July with maximum wind reported near subtropical latitudes Thereafter the anticyclone de-cayed slowly as the duration of sunshine decreased in Arctic latitudes Cyclonic circulation formed in the polar area at the end of August and spread as the high latitudes cooled The easterly circulation was displaced southward in the form of cellular ridges reaching low latitudes at the end of September and merging into the subtropical circulation Thus by October westerly circulation predominated over mid-dIe and high latitudes of the Northern Hemisphere stratosphere in low latitudes a variable easterly circulation was associated with fluctuations of the position of the subtropical ridge

During October November and December the polar cyclone deepened accompanied by increasing westerly winds over most of the area However several eastward pulsations of the Aleutian anticy-clone resulted in disturbances of the westerly flow over Alaska and northwestern Canada The anti-cyclone first appeared on November 6 as a weak disturbance at 5 mb over the eastern Pacific By November 20 the anticyclone was found over Alaska at all analysis levels Rapid intensification as well as an eastward movement occurred during the next week affecting the circulation as far east as Fort Churchill Canada After the initial pulse the anti-cyclone retrograded but it persisted although less intense during the rest of December High tempera-

tures were seen during thisperiod in a warm ridge stretching from the Caribbean to southern Europe and across Asia to eastern Siberia This subtropical system sloped northward with height in hydrostatic response to the warm air at higher levels By Decemshyher 18 the warm air at 2 mb over southern Europe exhibited measured temperatures higher than OC At the same time the axis of cold air elongated and split with one center visible ov6r central Canada At the 04-mb level the data indicated a cbnsidershyably disturbed temperature field during the last week of the year with warm air-apparent over the polar region and cold air displaced southward

The principal features of the circulation during 1968 at five representative rocket launch sites may be seen in the time sections (figs 1-5) of analyzed height and temperature values extracted from the weekly charts The annual trend of the height and temperature values is most pronounced at the middleshyand higllatitude stations (figs 1-3) with the largest range of values occurring in the more northerly statiois (Johnson and Gelman 1968) Superimposed on this annual trend characterized by maximum values in summer and minimum values in winter are various perturbations The largest of these perturbashytions was in January and was associated with the major stratospheric warming mentioned above Smaller scale disturbances associated with movements of the Aleutian anticyclone were seen in November and December At the tropical station of Antigua West Indies Associated State (WIAS) the range of values is very small with only very minor perturbashytions affecting the station (fig 5) There is a sugshygestion however of a double maximum at the time of the equinoxes associated with the semiannual variashytion in temperature and wind and related to the seasonal migration of the subtropical anticyclone as seen in the charts At the subtropical station of White Sands N Me (fig 4) a combination of the major annual variation and the semiannual variation is apparent (This discussion prepared by Melvyn E Gelman)

5

ACKNOWLEDGMENTS

Funds for the analysis of the 1968 chart series were provided by the National Aeronautics and Space Administration under contract P 44664 (G)

Personnel actively engaged in the analysis projectwere Project Manager F G Finger Project Analyst

M E Gelman Research Consultant A 1 Miller Data Processing D L Griffith and J A Booth and Computer Operations K W Johnson

Ballard H N A Review of Seven Papers Concern-ing the Measurement of Temperature in the Stratosphere and Mesosphere ECOM 5125 US Army Electronics Command Fort Mon-mouth NJ May 1967 67 pp

Barr W Correctionsof RadiationalError of Radio-sonde Temperature Measurements in the Stratos-pher US Army Electronics Command Fort Monmouth NJ 1966 (personal communication)

Drews W A A Thermistor Arrangement to Im-prove Temperature Measurement at High Alti-tude NASA Contract Report 533 Aug 1966 29 pp

Environmental Science Services Administration Weather Bureau Constant Pressure Charts MF-494 National Weather Records Center Ashe-ville NC 1968

Finger F G Woolf H M and Anderson C E A Method for Objective Analysis of Stratos-pheric Constant-Pressure Charts Monthly Weather Review Vol 93 No 10 Oct 1965 pp 619-638

Finger F_ G Woolf H M and Anderson C E Synoptic Analyses of the 5- 2- and 04-Milli-bar Surfaces for the IQSY Period Monthly Weather Review Vol 94 No 11 Nov 1966 pp 651-661

Johnson K W A Preliminary Study of the Strato-spheric Warming of December 1967- January 1968 Monthly Weather Review Vol 97 No 8 Aug 1969 pp 553-564

Johnson K W and Gelman M E Temperature and Height Variability in the Middle and Upper Stratosphere During 1964-1966 as Determined From Constant Pressure Charts Monthly Weather Review Vol 96 No 6 June 1968 pp 371-382

Mclnturff R M and Finger F G The Compati-bility of Radiosonde Data at Stratospheric Levels

6

Over the Northern Hemisphere ESSA Techshynical Memorandum WBTM DATAC 2 Silver Spring Md Dec 1968 61 pp

Miers B T and Beyers N J Rocketsonde Wind and Temperature Measurements Between 30 and 70 Km for Selected Stations Journalof Applied Meteorolgy Vol 3 No 1 Feb 1964 pp 16-26

Miller A J A Note on the Variability of Ternshyperature as Indicated by Rocletsonde Thermisshytors Journal of Applied Meteorology Vol 8

No 1 Feb 1969 pp 172-174

Miller A J and Schmidlin F J Rocketsonde Repeatability and Stratospheric Variability Journal of Applied Meteorology Vol 10 No 2 April 1971 pp 320-327

Muench H S Temperature Measurements in the 30- to 40-Kilometer Region Monthly Weather Review Vol 99 No 2 Feb 1971 pp 158-160

Reed R J McKenzie D J and Vyverberg J C Diurnal Tidal Motions Between 30 and 60 Kilometers in Summer Journal of the Atmxrsshypheric Sciences Vol 23 No 4 July 1966 pp 416-423

Staff Upper Air Branch National Meteorological Center Weekly Synoptic Analyses 5- 2- and 04-Mb Surfaces for 1964 (Based on Observations of the Meteorological Rocket Network During the IQSY ESSA Technical Report WB 2 Silver Spring Md Apr 1967a 176 pp

Staff Upper Air Branch National Meteorological Center Weekly Synoptic Analyses 5- 2- and 04-Mb Surfaces for 1965 (Based on Observa tions of the Meteorological Rocket Network During the IQSY ESSA Technical Report WB 3 Silver Spring Md Aug 1967b 173 pp

Staff Upper Air Branch National Meteorological Center Weekly Synoptic Analyses 5- 2- and 04-Mb Surfaces for 1966 [Based on Mete orological Rocketsonde and High-Level Rawinshysonde Observations] ESSA Technical Report WB 9 Silver Spring Md Jan 1969 169 pp

Staff Upper Air Branch National Meteorological Center Weekly Synoptic Analyses 5- 2- and 04-Millibar Surfaces for 1967 (Based on Meteshyorological Rocketsonde and High-Level Rawinshysonde Observations) ESSA Technical Report WB 12 Silver Spring Md Jan 1970 169 pp

World Data Center A Meteorology Data Report Meteorological Rocket Network Firings 1968 Vol V National Weather Records Center Asheshyville NC 1969

58

57 H --TEMP X-x

56

55

54

53

52 x-1

51 X X-Xx 04M8BX 3

-5045 shy

44shy

43_ bull 42 xlXX-~ -x X--~ -xxlt--- x- ~~X-X

41 --X- _xXx -

-40 X 2M8 -JAN1396MO shy

54Wa JcV~Ax- - - - - - - - -X X X - - 50 II 37-13

36 - ~x-X-X-X-X_x_xxxx -0

534 X I -X-

3 17 31 14 28 13 27 07 94 8 22 5 19 3 T 31 14 28 11 25 9 23 6 20 4 18 7

JAN 1968 FEB MAR APR 10AY MN JUL AUG SEPT OCT NOV DEC 1968

FIGURE 1-Fort Greely Alaska (64000N 145044W) analyzed values extracted from weekly 5- 2- and 04-mb charts

TEMP x57

56

55

- _S3~~ X--ex- X-x-xxX-x-x-x- -0--^ X-x-xx-x-X x k X- X-XXx

52X N51 842MB 2x48 O -3-50

E M

Fia yda

54M

536X

37I -o

i-X-x X17-- xxX x lx 6 YX X xx X Xx -l -5040 --- 244B ILI Ix 1-Z

13 7 P I D 7

36 041 -307311327IpR X 8I

FEB MAR MAY 1I AVG SEPT OCT NOV DEC 1968

35 17 1142 8MAV 19 2

JAN 1968 _APR_ N

FIGURE 2--ort Churchill Canada (W4deg4N 9349W) analyzed values extracted fromn weekly 5- 2-and 04-rob charts

TEMP x-x

57

54 0

X-X~ 1 X-XXX---- -Xe X X--X -x----NX -20 04MB

c44

-43 -1311P

47 x-x tx A e Xx x -20

5MB

36-1035 -0 -fX--Xx-x-X--X- - Xx-x-X-X-X XXx x shyx- X -x- xx IIIIx- ~x yy X- 30 x-X - Xx x-X-X -x -X x-x-U

IxIIF 1 1T1 1 1 1l I 1 1 l I 1 1 1 1 1 1 I Io X I 1 1 1 1 1 1 I I-fU I 3 1731 4 28 1327 0 24 8 22 19 3 17 31 4 28 125 9 23 6 20 4 8 - dAN 1968 FEB MAR APR MAY JUN JUL AUG SEPT OCT NOV DEC 1968

I FIGURE 3-Walops Island Va (370 50N75 029W) analyzed values extracted from weekly 5 2- and 04-mb charts

ATMOSPamp US DEPARTMENT OF COMMERCE

__ g Maurice H Stans Secretary NATIONAL OCEANIC AND ATMOSPHERIC ADMINISTRATION

___ _- _ Robert M White Administrator

____

c0 NATIONAL WEATHER SERVICE George P Cressman Director

NOAA Technical Report NWS 14

Weekly Synoptic Analyses 5- 2- and 04-Millibar Surfaces for 1968 (Based on meteorological rocketsonde and high-level rawinsonde observations)

STAFF UPPER AIR BRANCH National Meteorological Center

SILVER SPRING MD

MAY 101

This repor was repared with suprt t of the National Aeronauticsand-Space Administration under contract P-44664(G)

UDC 55L509215515067551507362 1551508 822 (7) 1968-53 5515 Meteorology

509 Synoptic meteorology 21 Synoptic eharts

506 Periodical observational data 7 Upper air data

507 Instrument carrier 3621 Rockets

-508 Meteorological instruments 822 Radiosondes - Rawinsondes

(7) North America 1968-53 Weekly during 1968

UNITED STATES GOVERNMENT PRINTING OFFICE

WASHINGTON 1971

For sale by the Superintendent of Documnents US Government Printing Office Washington DC 20402 - Price $150

Stock Number 0318-0017

II

Contents PAGE

Introduction --------- ----------------- ------ -------- ----------------- ------ ------ 1

Processing of rawinsonde data ---------------------------------------------------- 1

Processing of rocketsonde data ----------------------------------------------------

Station Model and Reporting Rocket Stations ---------------------------------------- 13

2

Analysis procedure ------------------------------------------------------------- 3

Discussion of the 1968 charts ----------------------------------------------------- 4

Acknowledgments --------------------------------------------------------------- 6

References -------------------------------------------------------------------- 6

Weekly 5- 2- and 04-mb synoptic charts ------------------------------------------- 14169

LIST OF ILLUSTRATIONS

rIGURE

1 Analyzed values from weekly charts at Fort Greely ---------------------------------- 7

2 Analyzed values from weekly charts at Fort Churchill ------------------------------- 8

3 Analyzed values from weekly charts at Wallops Island ------------------------------ 9

4 Analyzed values from weekly charts at White Sands -------------------------------- 10

5 Analyzed values from weekly charts at Antigua ------------------------------------ 11

iii

Weekly Synoptic Analyses 5- 2- and 04-Millibar Surfaces for 1968

(Based on meteorological rocketsonde and high-level rawinsonde observations)

STAFF UPPER AIR BRANCH

National Meteorological Center NOAA Hillcrest Heights Md

ABSTRACT Data from meteorological rocketsonde and rawinsonde observations have been employed to analyze a series of high-altitude synoptic charts Methods employed for processhysing the various types of data and the analysis procedure used are described

Broad-scale analyses of the 5- 2- and 04 mb surfaces primarily covering North America and adjacent ocean areas are presented at weekly intervals for 1968 A brief discussion of the height and temperature fields is also given Circulation and temperature changes associated with a major stratospheric warming during January are among the discussion items

INTRODUCTION

This volume represents the fifth in a series of con-stant-pressure charts for the upper stratosphere based on rocketsonde and very high level rawinsonde data obtained over North America and adjacent ocean areas These charts have been analyzed by the Upper Air Branch of the National Weather Services National Meteorological Center (Staff 1967a 1967b 1969 1970)

At 5 mb both rawinsonde and rocketsonde data were used to derive the height and temperature fields Above 5 mb rawinsonde data were seldom available and rocket observations constituted the basic data source The Station Model and Reporting Rocket Stations chart (p 13) shows the locations of 20 meteorological rocket launch sites within the map analysis area for which data were available -in 1968

The present series of analyses at weekly intervals includes charts for the 5- 2- and 04-mb surfaces (approximately 36 42 and 55 kin respectively) nominally representing broad-scale synoptic conditions

on each Wednesday of the analysis period In addition to a description of the techniques employed in obtainshying these charts a brief discussion of large-scale features is also included

PROCESSING OF RAWINSONDE DATA

The preparation of high-level data for analysis presents many problems Some of the difficulties enshycountered in the use of rawinsonde information such as achieving compatibility between daytime and nightshytime observations extrapolation and interpolation of data and identification of erroneous reports have been summarized previously (Finger et al 1965 1966)

Temperature and height adjustments designed to compensate for instrumental radiation errors were apshyplied to all 5-mb rawinsonde reports Initially an adshyjustment was made which reduced values from daytime observations to the level of those values reported from nighttime observations Magnitudes of these day-night adjustments which are intended to account for the

1

effects of solar heating on the rod thermitor were 2- and 04-mb surfaces was as follows determined with the aid of a computer program that calculated monthly mean differences between reported daylight and darkness values Input to this program consisted of all available 5-mb data for 1964 and 1967 from stations in North America and adjacent ocean areas that employ US outrigger-type radiosonde in-struments (for details of the adjustment and further references see Mclnturff and Finger 1968)

Theoretical and laboratory studies of the rod thermistor used in present-day radiosondes indicated that a significant error may be induced by infrared cooling at stratospheric levels above about 10 mb Therefore a second adjustment (Barr 1966) was added to all reported 5-mb data including observa-tions made actually in darkness and daytime data that had been adjusted for solar-radiation error The magnitude of the temperature correction is a function of reported temperature while the height adjustment varies linearly with the temperature correction

Rawinsonde data utilized for the 5-mb charts were processed by computer methods Inputs to the com-puter program consisted of observations from North America and adjacent oceanareas for 7- 5- 4- and 3-mb levels in the form of punched cards obtained from the National Weather Records Center Output listings included all observations for 1 week at each station Data for levels other than 5 mb were also listed to supply the analyst with as much suppleshymentary information as possible Thermal winds and

corresponding horizontal temperature gradients were computed for the layers from 7 to 5 7 to 4 and 5 to 4 nib

After processing the rawinsonde-derived tempera-ture height wind and thermal wind were plotted on work charts For charts presented in this publication the rawinsonde data have been omitted for the sake of legibility

PROCESSING OF ROCKETSONDE DATA

Winds and termperatures measured by rocketsonde systems comprised the basic data sample for analyses at the 2- and 04-mb levels and were also used in combination with rawinsonde data for the 5-mb charts Rocketsonde information was obtained for this proj-ect in the form of magnetic tape identical in format to published information contained in the Meteorolog-ical Rocket Network (MRN) Firings (World Data Center A 1969)

The procedure for extraction of rocketsonde in-formation and for computation of heights of the 5

a Wind and temperature profiles were processed by a computer program designed to reduce the amplitude of rapid oscillations in the vertical by using a simple (1-2-1) smoothing technique This processing was done because analyses are intended to portray only the broad-scale stratoshyspheric features

b Temperatures were modified above 40 km in accordance with Drews (1966) publication one of several theoretical studies (see the review article by Ballard 1967) For the Areasonde IA the instrument most widely employed during 1968 the correction applied to the temperature profiles increased from PdegC at 42 km to about 9degC at 58 km

cAn initial estimate of the geopotential height for each station at the respective pressure levels (5 2 and 04 mb) had to be made before the temperature for that particular level could be

selected This estimate was obtained by deriving the temporal trend of the geopotential height for the station from the lower level analyzed charts and by applying this trend to the geopotential height for the station as shown by the previously analyzed chart The temperature at this estishymated height was then extracted from the ternshyperature profile

d The true geopotential height of the pressure surface at each station was then hydrostatically computed for each available temperature profile This height was obtained by deriving a layershymean temperature between the extracted tershyperature of the upper level and the temperature obtained from the previously completed lower

level analysis Computer-analyzed 10-ob charts (Environmental Science Services Administration 1968) based exclusively on rawinsonde data were used as foundation for hydrostatic compushytation of the height of the 5-mb surface For the 5- and 2-mb levels a constant lapse rate was considered representative However because a temperature maximum (associated with the stratashypause) usually exists between 2 and 04 nib mean temperatures were derived by usifig values exshytracted at each whole kilometer between these two pressure levels

e Wind components were extracted from the smoothed profiles at the height of the constantshypressure surface and a resultant wind was cornshyputed

2

f Thermal winds were determined for 6-kn layers surrounding each pressure surface at the report-ing station

The rooketsonde data (temperature height wind direction and speed and thermal wind) were plotted on work charts On the charts presented for publica-tion three observations are shown when available for each station Heights and thermal winds have been omitted for the sake of legibility The Station Model and Reporting Rocket Stations chart illustrates the symbols used to distinguish the data obtained on Wednesdays from off-time data

ANALYSIS PROCEDURE

Conventional techniques including differential a tnalysistechs construct t -2-m wdnierenused ilanalysis methods were used to construct the 5- 2-

and 04-mb charts H~owever because of the sparsity

of observations data acquired for the entire week were

examined to dtriethe synoptic changes that took petaingplace during the week Thus conditions pertaining

to Wednesday the analysis day were deduced The analysis system consisted of the following

steps

a Isotherms were derived using both processed rocketsonde and rawinsonde temperatures where available In spite of the corrections applied to the 5-mb rawinsonde temperature data large differences could sometimes be seen when corn-paring rocketsonde data that were close in time and distance (Muench 1971) Generally the problem could be resolved by giving greater weight to rawinsonde stations employing hyp-someters In a few cases the difficulty even oc-curred with hypsometer radiosondes therefore some compromise value had to be chosen usu-ally closer to the rocketsonde-reported temper-ature Computed thermal winds were especially useful in determining horizontal temperature gradients and the relative location of warm and cold areas Where possible time-height sections of temperature were plotted as a further aid in deriving the isotherms

bA mean temperature field representative of the layer between the previously analyzed lower sur-face and the selected surface was derived graph-ically This mean field represents a geopotential thi6kness which when added to the lower level height field yields a smooth conservative first approximation to the contour pattern at th6 upper surface

c Reported winds and computed heights for indishyvidual stations were then used to adjust the first approximation of the contour field using the assumption of geostrophic flow Winds were acshycorded the highest priority for this adjustment When large adjustments were made to the conshytour field the temperature field was then adshyjusted to maintain hydrostatic consistency

d The analysis was reviewed for vertical and temshyporal consistency For example circulation censhyters ridges and troughs were examined with the aid of all available data to verify vertical slope and movement with time Time-height secshytions and height-change charts were especially useful for these purposes

The above procedures appear to produce excellent results at 5 mb and were successfully applied to ohshytain the 2- and 04-mb charts Generally only slightadjustments of the first-approximation height fields

were necessa at the 5- and 2-mb levels However

wrtierncsaya h -ad -blvlHwvr rather formidable analysis problems were evident atthe 04-mb level One problem arises from the apparshyent intersection of the stratopause with the 04-mb level Because the normal stratospheric temperature inversion ceases at the stratopause level the graphical method for obtaining mean temperature which deshypends on the existence of a linear profile is no longer valid Large adjustments must be made especially at lower latitudes in the graphically derived height field to conform with the computed height-at each station (as discussed in the previous section)

Another difficulty was the apparent occurrence of large day-to-day temperature changes at times exceedshying 10C (Miller 1969) and persistent oscillations in many wind profiles In most cases deviations of reported temperatures and winds from one another could be accounted for by identifiable rapid largeshyscale synoptic changes Sometimes reports within a few hours of each other at a single station exhibited temperature changes of 5 to 70 C over a limited height interval near the stratopause It has been shown that such small-scale subsynoptie changes are possible at these levels (Miller and Schmidlin 1971) Thus some intermediate value was chosen for analyshy

sis to represent the value on the analysis day Ocshycasionally it was impossible to make a reasonable reconciliation of reported station values

An additional problem is encountered in the sumshymer charts During that season circulation at the upper surfaces (2 and 0 mb) would be expected to follow the pattern established for lower levels that is a rather uniform easterly flow about an anticyclone

3

centered at or very near the North Pole However on- a typical summertime 04-mb chart most reported rocketsonde winds exhibit significant southerly corn-ponents If these winds- were to be given full weight in the analysis the resulting pattern would consist of contours oriented from- southeast to northwest spiraling toward a high center located apparently over northern Europe

The prevalence of positive meridional components in summertime rocketsonde winds has been noted previously (Miers and Beyers 1964) Studies (Reed et al 1966) based on MRN data for several summers have demonstrated that the meridional wind corn-ponent resulting from the diurnal tide reaches maxi-mum southerly strength at about noon local time Because most MRN firings occur near local noon

the measured winds naturally contain this component Although no adjustments were made in individual reports the analysis procedure includes suitable compensation Differences in the reported winds and orientation of the contours may be quite pronounced especially on the summertime charts Strong westerly winds of winter usually mask the weak diurnal com-ponent but there is a possibility that this component may contribute to some bias in analysis during periods of weak circulation

Although careful consideration of high-level data allows a broad-scale depiction of circulation patterns up to 04 rb the -sparsity of reports requires an increasing amount of subjectivity as the analysis pro-ceeds to this high level As yet the analyst has little in the way of synoptic models for guidance with respect to the probable contour and isotherm patterns and the phase relation between these patterns in areas of sparse data The geographical area of analy-sis for the charts has thus been reduced in accordance with the available data The justification for some analyses depends on the interpretation of the limited am6unt of data in such a way as to portray a co-herent sequence of synoptic events In spite of these factors surprisingly little alteration in the principal features of the circulation and temperature distribu-tion shown in the final analysis can be made without inordinately violating spine of the data In general the contours and isotherms -depicted are felt to be good approximations to the flow and temperature patterns at these levels Even so the same degree of accuracy that is found customarily in the analysis of charts at lower levels should not be expected

A contour interval of 320-geopotential meters (gpm) was used throughout- the year In addition

intermediate dashed contours were -used to outline

areas of relatively weak gradient especially during the spring and fall changeover periods Isotherms were drawn and labeled at 5C intervals

DISCUSSION OF THE 1968 CHARTS

The temperature and circulation anomalies assoshyciated with the major stratospheric warming that began in December 1967 (Johnson 1969 Staff 1970) persisted into the beginning of 1968 Maximum temperatures bad been observed at the end of Deshycember with a reversal of the normal wintertime temperature gradient between the North Pole and middle latitudes occurring first at the highest levels then proceeding downward to lower levels Thus at 5 mb on January 3 a wave-two pattern in the isoshytherms and contours was clearly seen with the warm air stretching over the Pole associated with -the two cyclones and with the cold air in the Bering Sea and the Atlantic Ocean associated with the two antishycyclones At 2 nib cold air had returned to the polar area with a warm aiea apparent over western Canada Hydrostatically consistent with this situation was a weakening of the circulation at 2 mb and a disapshypearance of the North Atlantic anticyclone at the 04-mb level with a strong anticyclone apparent in the eastern Pacific The major effects of the stratoshyspheric warming had thus diminished at the upper levels but were propagating downward with time and were still evident at lower altitudes By January 10 anticyclonic circulation dominated the polar reshygion at 5 and 2 mb but at 04 mb the polar cyclone had become reestablished During the next week the transition back to a relatively undisturbed westerly circulation could -be noted at 2 mb and by January 24 this became the pattern at the 5-mb level

During February the polar cyclone intensified at all levels but did not attain the depth reached before the warming The cold air at 5 and 2 mb was someshywhat displaced from the Pole toward northern Canada

- whereas at 04 mb warm air extending from northern Siberia dominated the polar area Although perturbashytions in the temperature fields at high latitudes were noted throughout February and March no significant departures from the basic westerly circulation of the polar vortex were observed The final springtime change from winter to sumshymer conditions could be seen at the end of March at 5 and 2 mrb A warm area was first seen north of Alaska and moved over the polar region In associashytion with the warm area anticyclonic circulation developed in mid-April over the Kamchatka-Alaska

4

region The anticyclonic circulation was displaced northward and an easterly circulation dominated the polar region by the end of April The cyclonic circulation with its associated cold westerlies was displaced southward during May as the polar anti-cyclone intensified and expanded By the end of May the middle and upper stratosphere over the entire Northern Hemisphere was under the influence of sum-mer easterly circulation with the warm air centered at the Pole

The summertime polar anticyclone warmed further during June and gradually intensified Peak tempera-ture and height at the Pole were reached toward the beginning of July with maximum wind reported near subtropical latitudes Thereafter the anticyclone de-cayed slowly as the duration of sunshine decreased in Arctic latitudes Cyclonic circulation formed in the polar area at the end of August and spread as the high latitudes cooled The easterly circulation was displaced southward in the form of cellular ridges reaching low latitudes at the end of September and merging into the subtropical circulation Thus by October westerly circulation predominated over mid-dIe and high latitudes of the Northern Hemisphere stratosphere in low latitudes a variable easterly circulation was associated with fluctuations of the position of the subtropical ridge

During October November and December the polar cyclone deepened accompanied by increasing westerly winds over most of the area However several eastward pulsations of the Aleutian anticy-clone resulted in disturbances of the westerly flow over Alaska and northwestern Canada The anti-cyclone first appeared on November 6 as a weak disturbance at 5 mb over the eastern Pacific By November 20 the anticyclone was found over Alaska at all analysis levels Rapid intensification as well as an eastward movement occurred during the next week affecting the circulation as far east as Fort Churchill Canada After the initial pulse the anti-cyclone retrograded but it persisted although less intense during the rest of December High tempera-

tures were seen during thisperiod in a warm ridge stretching from the Caribbean to southern Europe and across Asia to eastern Siberia This subtropical system sloped northward with height in hydrostatic response to the warm air at higher levels By Decemshyher 18 the warm air at 2 mb over southern Europe exhibited measured temperatures higher than OC At the same time the axis of cold air elongated and split with one center visible ov6r central Canada At the 04-mb level the data indicated a cbnsidershyably disturbed temperature field during the last week of the year with warm air-apparent over the polar region and cold air displaced southward

The principal features of the circulation during 1968 at five representative rocket launch sites may be seen in the time sections (figs 1-5) of analyzed height and temperature values extracted from the weekly charts The annual trend of the height and temperature values is most pronounced at the middleshyand higllatitude stations (figs 1-3) with the largest range of values occurring in the more northerly statiois (Johnson and Gelman 1968) Superimposed on this annual trend characterized by maximum values in summer and minimum values in winter are various perturbations The largest of these perturbashytions was in January and was associated with the major stratospheric warming mentioned above Smaller scale disturbances associated with movements of the Aleutian anticyclone were seen in November and December At the tropical station of Antigua West Indies Associated State (WIAS) the range of values is very small with only very minor perturbashytions affecting the station (fig 5) There is a sugshygestion however of a double maximum at the time of the equinoxes associated with the semiannual variashytion in temperature and wind and related to the seasonal migration of the subtropical anticyclone as seen in the charts At the subtropical station of White Sands N Me (fig 4) a combination of the major annual variation and the semiannual variation is apparent (This discussion prepared by Melvyn E Gelman)

5

ACKNOWLEDGMENTS

Funds for the analysis of the 1968 chart series were provided by the National Aeronautics and Space Administration under contract P 44664 (G)

Personnel actively engaged in the analysis projectwere Project Manager F G Finger Project Analyst

M E Gelman Research Consultant A 1 Miller Data Processing D L Griffith and J A Booth and Computer Operations K W Johnson

Ballard H N A Review of Seven Papers Concern-ing the Measurement of Temperature in the Stratosphere and Mesosphere ECOM 5125 US Army Electronics Command Fort Mon-mouth NJ May 1967 67 pp

Barr W Correctionsof RadiationalError of Radio-sonde Temperature Measurements in the Stratos-pher US Army Electronics Command Fort Monmouth NJ 1966 (personal communication)

Drews W A A Thermistor Arrangement to Im-prove Temperature Measurement at High Alti-tude NASA Contract Report 533 Aug 1966 29 pp

Environmental Science Services Administration Weather Bureau Constant Pressure Charts MF-494 National Weather Records Center Ashe-ville NC 1968

Finger F G Woolf H M and Anderson C E A Method for Objective Analysis of Stratos-pheric Constant-Pressure Charts Monthly Weather Review Vol 93 No 10 Oct 1965 pp 619-638

Finger F_ G Woolf H M and Anderson C E Synoptic Analyses of the 5- 2- and 04-Milli-bar Surfaces for the IQSY Period Monthly Weather Review Vol 94 No 11 Nov 1966 pp 651-661

Johnson K W A Preliminary Study of the Strato-spheric Warming of December 1967- January 1968 Monthly Weather Review Vol 97 No 8 Aug 1969 pp 553-564

Johnson K W and Gelman M E Temperature and Height Variability in the Middle and Upper Stratosphere During 1964-1966 as Determined From Constant Pressure Charts Monthly Weather Review Vol 96 No 6 June 1968 pp 371-382

Mclnturff R M and Finger F G The Compati-bility of Radiosonde Data at Stratospheric Levels

6

Over the Northern Hemisphere ESSA Techshynical Memorandum WBTM DATAC 2 Silver Spring Md Dec 1968 61 pp

Miers B T and Beyers N J Rocketsonde Wind and Temperature Measurements Between 30 and 70 Km for Selected Stations Journalof Applied Meteorolgy Vol 3 No 1 Feb 1964 pp 16-26

Miller A J A Note on the Variability of Ternshyperature as Indicated by Rocletsonde Thermisshytors Journal of Applied Meteorology Vol 8

No 1 Feb 1969 pp 172-174

Miller A J and Schmidlin F J Rocketsonde Repeatability and Stratospheric Variability Journal of Applied Meteorology Vol 10 No 2 April 1971 pp 320-327

Muench H S Temperature Measurements in the 30- to 40-Kilometer Region Monthly Weather Review Vol 99 No 2 Feb 1971 pp 158-160

Reed R J McKenzie D J and Vyverberg J C Diurnal Tidal Motions Between 30 and 60 Kilometers in Summer Journal of the Atmxrsshypheric Sciences Vol 23 No 4 July 1966 pp 416-423

Staff Upper Air Branch National Meteorological Center Weekly Synoptic Analyses 5- 2- and 04-Mb Surfaces for 1964 (Based on Observations of the Meteorological Rocket Network During the IQSY ESSA Technical Report WB 2 Silver Spring Md Apr 1967a 176 pp

Staff Upper Air Branch National Meteorological Center Weekly Synoptic Analyses 5- 2- and 04-Mb Surfaces for 1965 (Based on Observa tions of the Meteorological Rocket Network During the IQSY ESSA Technical Report WB 3 Silver Spring Md Aug 1967b 173 pp

Staff Upper Air Branch National Meteorological Center Weekly Synoptic Analyses 5- 2- and 04-Mb Surfaces for 1966 [Based on Mete orological Rocketsonde and High-Level Rawinshysonde Observations] ESSA Technical Report WB 9 Silver Spring Md Jan 1969 169 pp

Staff Upper Air Branch National Meteorological Center Weekly Synoptic Analyses 5- 2- and 04-Millibar Surfaces for 1967 (Based on Meteshyorological Rocketsonde and High-Level Rawinshysonde Observations) ESSA Technical Report WB 12 Silver Spring Md Jan 1970 169 pp

World Data Center A Meteorology Data Report Meteorological Rocket Network Firings 1968 Vol V National Weather Records Center Asheshyville NC 1969

58

57 H --TEMP X-x

56

55

54

53

52 x-1

51 X X-Xx 04M8BX 3

-5045 shy

44shy

43_ bull 42 xlXX-~ -x X--~ -xxlt--- x- ~~X-X

41 --X- _xXx -

-40 X 2M8 -JAN1396MO shy

54Wa JcV~Ax- - - - - - - - -X X X - - 50 II 37-13

36 - ~x-X-X-X-X_x_xxxx -0

534 X I -X-

3 17 31 14 28 13 27 07 94 8 22 5 19 3 T 31 14 28 11 25 9 23 6 20 4 18 7

JAN 1968 FEB MAR APR 10AY MN JUL AUG SEPT OCT NOV DEC 1968

FIGURE 1-Fort Greely Alaska (64000N 145044W) analyzed values extracted from weekly 5- 2- and 04-mb charts

TEMP x57

56

55

- _S3~~ X--ex- X-x-xxX-x-x-x- -0--^ X-x-xx-x-X x k X- X-XXx

52X N51 842MB 2x48 O -3-50

E M

Fia yda

54M

536X

37I -o

i-X-x X17-- xxX x lx 6 YX X xx X Xx -l -5040 --- 244B ILI Ix 1-Z

13 7 P I D 7

36 041 -307311327IpR X 8I

FEB MAR MAY 1I AVG SEPT OCT NOV DEC 1968

35 17 1142 8MAV 19 2

JAN 1968 _APR_ N

FIGURE 2--ort Churchill Canada (W4deg4N 9349W) analyzed values extracted fromn weekly 5- 2-and 04-rob charts

TEMP x-x

57

54 0

X-X~ 1 X-XXX---- -Xe X X--X -x----NX -20 04MB

c44

-43 -1311P

47 x-x tx A e Xx x -20

5MB

36-1035 -0 -fX--Xx-x-X--X- - Xx-x-X-X-X XXx x shyx- X -x- xx IIIIx- ~x yy X- 30 x-X - Xx x-X-X -x -X x-x-U

IxIIF 1 1T1 1 1 1l I 1 1 l I 1 1 1 1 1 1 I Io X I 1 1 1 1 1 1 I I-fU I 3 1731 4 28 1327 0 24 8 22 19 3 17 31 4 28 125 9 23 6 20 4 8 - dAN 1968 FEB MAR APR MAY JUN JUL AUG SEPT OCT NOV DEC 1968

I FIGURE 3-Walops Island Va (370 50N75 029W) analyzed values extracted from weekly 5 2- and 04-mb charts

UDC 55L509215515067551507362 1551508 822 (7) 1968-53 5515 Meteorology

509 Synoptic meteorology 21 Synoptic eharts

506 Periodical observational data 7 Upper air data

507 Instrument carrier 3621 Rockets

-508 Meteorological instruments 822 Radiosondes - Rawinsondes

(7) North America 1968-53 Weekly during 1968

UNITED STATES GOVERNMENT PRINTING OFFICE

WASHINGTON 1971

For sale by the Superintendent of Documnents US Government Printing Office Washington DC 20402 - Price $150

Stock Number 0318-0017

II

Contents PAGE

Introduction --------- ----------------- ------ -------- ----------------- ------ ------ 1

Processing of rawinsonde data ---------------------------------------------------- 1

Processing of rocketsonde data ----------------------------------------------------

Station Model and Reporting Rocket Stations ---------------------------------------- 13

2

Analysis procedure ------------------------------------------------------------- 3

Discussion of the 1968 charts ----------------------------------------------------- 4

Acknowledgments --------------------------------------------------------------- 6

References -------------------------------------------------------------------- 6

Weekly 5- 2- and 04-mb synoptic charts ------------------------------------------- 14169

LIST OF ILLUSTRATIONS

rIGURE

1 Analyzed values from weekly charts at Fort Greely ---------------------------------- 7

2 Analyzed values from weekly charts at Fort Churchill ------------------------------- 8

3 Analyzed values from weekly charts at Wallops Island ------------------------------ 9

4 Analyzed values from weekly charts at White Sands -------------------------------- 10

5 Analyzed values from weekly charts at Antigua ------------------------------------ 11

iii

Weekly Synoptic Analyses 5- 2- and 04-Millibar Surfaces for 1968

(Based on meteorological rocketsonde and high-level rawinsonde observations)

STAFF UPPER AIR BRANCH

National Meteorological Center NOAA Hillcrest Heights Md

ABSTRACT Data from meteorological rocketsonde and rawinsonde observations have been employed to analyze a series of high-altitude synoptic charts Methods employed for processhysing the various types of data and the analysis procedure used are described

Broad-scale analyses of the 5- 2- and 04 mb surfaces primarily covering North America and adjacent ocean areas are presented at weekly intervals for 1968 A brief discussion of the height and temperature fields is also given Circulation and temperature changes associated with a major stratospheric warming during January are among the discussion items

INTRODUCTION

This volume represents the fifth in a series of con-stant-pressure charts for the upper stratosphere based on rocketsonde and very high level rawinsonde data obtained over North America and adjacent ocean areas These charts have been analyzed by the Upper Air Branch of the National Weather Services National Meteorological Center (Staff 1967a 1967b 1969 1970)

At 5 mb both rawinsonde and rocketsonde data were used to derive the height and temperature fields Above 5 mb rawinsonde data were seldom available and rocket observations constituted the basic data source The Station Model and Reporting Rocket Stations chart (p 13) shows the locations of 20 meteorological rocket launch sites within the map analysis area for which data were available -in 1968

The present series of analyses at weekly intervals includes charts for the 5- 2- and 04-mb surfaces (approximately 36 42 and 55 kin respectively) nominally representing broad-scale synoptic conditions

on each Wednesday of the analysis period In addition to a description of the techniques employed in obtainshying these charts a brief discussion of large-scale features is also included

PROCESSING OF RAWINSONDE DATA

The preparation of high-level data for analysis presents many problems Some of the difficulties enshycountered in the use of rawinsonde information such as achieving compatibility between daytime and nightshytime observations extrapolation and interpolation of data and identification of erroneous reports have been summarized previously (Finger et al 1965 1966)

Temperature and height adjustments designed to compensate for instrumental radiation errors were apshyplied to all 5-mb rawinsonde reports Initially an adshyjustment was made which reduced values from daytime observations to the level of those values reported from nighttime observations Magnitudes of these day-night adjustments which are intended to account for the

1

effects of solar heating on the rod thermitor were 2- and 04-mb surfaces was as follows determined with the aid of a computer program that calculated monthly mean differences between reported daylight and darkness values Input to this program consisted of all available 5-mb data for 1964 and 1967 from stations in North America and adjacent ocean areas that employ US outrigger-type radiosonde in-struments (for details of the adjustment and further references see Mclnturff and Finger 1968)

Theoretical and laboratory studies of the rod thermistor used in present-day radiosondes indicated that a significant error may be induced by infrared cooling at stratospheric levels above about 10 mb Therefore a second adjustment (Barr 1966) was added to all reported 5-mb data including observa-tions made actually in darkness and daytime data that had been adjusted for solar-radiation error The magnitude of the temperature correction is a function of reported temperature while the height adjustment varies linearly with the temperature correction

Rawinsonde data utilized for the 5-mb charts were processed by computer methods Inputs to the com-puter program consisted of observations from North America and adjacent oceanareas for 7- 5- 4- and 3-mb levels in the form of punched cards obtained from the National Weather Records Center Output listings included all observations for 1 week at each station Data for levels other than 5 mb were also listed to supply the analyst with as much suppleshymentary information as possible Thermal winds and

corresponding horizontal temperature gradients were computed for the layers from 7 to 5 7 to 4 and 5 to 4 nib

After processing the rawinsonde-derived tempera-ture height wind and thermal wind were plotted on work charts For charts presented in this publication the rawinsonde data have been omitted for the sake of legibility

PROCESSING OF ROCKETSONDE DATA

Winds and termperatures measured by rocketsonde systems comprised the basic data sample for analyses at the 2- and 04-mb levels and were also used in combination with rawinsonde data for the 5-mb charts Rocketsonde information was obtained for this proj-ect in the form of magnetic tape identical in format to published information contained in the Meteorolog-ical Rocket Network (MRN) Firings (World Data Center A 1969)

The procedure for extraction of rocketsonde in-formation and for computation of heights of the 5

a Wind and temperature profiles were processed by a computer program designed to reduce the amplitude of rapid oscillations in the vertical by using a simple (1-2-1) smoothing technique This processing was done because analyses are intended to portray only the broad-scale stratoshyspheric features

b Temperatures were modified above 40 km in accordance with Drews (1966) publication one of several theoretical studies (see the review article by Ballard 1967) For the Areasonde IA the instrument most widely employed during 1968 the correction applied to the temperature profiles increased from PdegC at 42 km to about 9degC at 58 km

cAn initial estimate of the geopotential height for each station at the respective pressure levels (5 2 and 04 mb) had to be made before the temperature for that particular level could be

selected This estimate was obtained by deriving the temporal trend of the geopotential height for the station from the lower level analyzed charts and by applying this trend to the geopotential height for the station as shown by the previously analyzed chart The temperature at this estishymated height was then extracted from the ternshyperature profile

d The true geopotential height of the pressure surface at each station was then hydrostatically computed for each available temperature profile This height was obtained by deriving a layershymean temperature between the extracted tershyperature of the upper level and the temperature obtained from the previously completed lower

level analysis Computer-analyzed 10-ob charts (Environmental Science Services Administration 1968) based exclusively on rawinsonde data were used as foundation for hydrostatic compushytation of the height of the 5-mb surface For the 5- and 2-mb levels a constant lapse rate was considered representative However because a temperature maximum (associated with the stratashypause) usually exists between 2 and 04 nib mean temperatures were derived by usifig values exshytracted at each whole kilometer between these two pressure levels

e Wind components were extracted from the smoothed profiles at the height of the constantshypressure surface and a resultant wind was cornshyputed

2

f Thermal winds were determined for 6-kn layers surrounding each pressure surface at the report-ing station

The rooketsonde data (temperature height wind direction and speed and thermal wind) were plotted on work charts On the charts presented for publica-tion three observations are shown when available for each station Heights and thermal winds have been omitted for the sake of legibility The Station Model and Reporting Rocket Stations chart illustrates the symbols used to distinguish the data obtained on Wednesdays from off-time data

ANALYSIS PROCEDURE

Conventional techniques including differential a tnalysistechs construct t -2-m wdnierenused ilanalysis methods were used to construct the 5- 2-

and 04-mb charts H~owever because of the sparsity

of observations data acquired for the entire week were

examined to dtriethe synoptic changes that took petaingplace during the week Thus conditions pertaining

to Wednesday the analysis day were deduced The analysis system consisted of the following

steps

a Isotherms were derived using both processed rocketsonde and rawinsonde temperatures where available In spite of the corrections applied to the 5-mb rawinsonde temperature data large differences could sometimes be seen when corn-paring rocketsonde data that were close in time and distance (Muench 1971) Generally the problem could be resolved by giving greater weight to rawinsonde stations employing hyp-someters In a few cases the difficulty even oc-curred with hypsometer radiosondes therefore some compromise value had to be chosen usu-ally closer to the rocketsonde-reported temper-ature Computed thermal winds were especially useful in determining horizontal temperature gradients and the relative location of warm and cold areas Where possible time-height sections of temperature were plotted as a further aid in deriving the isotherms

bA mean temperature field representative of the layer between the previously analyzed lower sur-face and the selected surface was derived graph-ically This mean field represents a geopotential thi6kness which when added to the lower level height field yields a smooth conservative first approximation to the contour pattern at th6 upper surface

c Reported winds and computed heights for indishyvidual stations were then used to adjust the first approximation of the contour field using the assumption of geostrophic flow Winds were acshycorded the highest priority for this adjustment When large adjustments were made to the conshytour field the temperature field was then adshyjusted to maintain hydrostatic consistency

d The analysis was reviewed for vertical and temshyporal consistency For example circulation censhyters ridges and troughs were examined with the aid of all available data to verify vertical slope and movement with time Time-height secshytions and height-change charts were especially useful for these purposes

The above procedures appear to produce excellent results at 5 mb and were successfully applied to ohshytain the 2- and 04-mb charts Generally only slightadjustments of the first-approximation height fields

were necessa at the 5- and 2-mb levels However

wrtierncsaya h -ad -blvlHwvr rather formidable analysis problems were evident atthe 04-mb level One problem arises from the apparshyent intersection of the stratopause with the 04-mb level Because the normal stratospheric temperature inversion ceases at the stratopause level the graphical method for obtaining mean temperature which deshypends on the existence of a linear profile is no longer valid Large adjustments must be made especially at lower latitudes in the graphically derived height field to conform with the computed height-at each station (as discussed in the previous section)

Another difficulty was the apparent occurrence of large day-to-day temperature changes at times exceedshying 10C (Miller 1969) and persistent oscillations in many wind profiles In most cases deviations of reported temperatures and winds from one another could be accounted for by identifiable rapid largeshyscale synoptic changes Sometimes reports within a few hours of each other at a single station exhibited temperature changes of 5 to 70 C over a limited height interval near the stratopause It has been shown that such small-scale subsynoptie changes are possible at these levels (Miller and Schmidlin 1971) Thus some intermediate value was chosen for analyshy

sis to represent the value on the analysis day Ocshycasionally it was impossible to make a reasonable reconciliation of reported station values

An additional problem is encountered in the sumshymer charts During that season circulation at the upper surfaces (2 and 0 mb) would be expected to follow the pattern established for lower levels that is a rather uniform easterly flow about an anticyclone

3

centered at or very near the North Pole However on- a typical summertime 04-mb chart most reported rocketsonde winds exhibit significant southerly corn-ponents If these winds- were to be given full weight in the analysis the resulting pattern would consist of contours oriented from- southeast to northwest spiraling toward a high center located apparently over northern Europe

The prevalence of positive meridional components in summertime rocketsonde winds has been noted previously (Miers and Beyers 1964) Studies (Reed et al 1966) based on MRN data for several summers have demonstrated that the meridional wind corn-ponent resulting from the diurnal tide reaches maxi-mum southerly strength at about noon local time Because most MRN firings occur near local noon

the measured winds naturally contain this component Although no adjustments were made in individual reports the analysis procedure includes suitable compensation Differences in the reported winds and orientation of the contours may be quite pronounced especially on the summertime charts Strong westerly winds of winter usually mask the weak diurnal com-ponent but there is a possibility that this component may contribute to some bias in analysis during periods of weak circulation

Although careful consideration of high-level data allows a broad-scale depiction of circulation patterns up to 04 rb the -sparsity of reports requires an increasing amount of subjectivity as the analysis pro-ceeds to this high level As yet the analyst has little in the way of synoptic models for guidance with respect to the probable contour and isotherm patterns and the phase relation between these patterns in areas of sparse data The geographical area of analy-sis for the charts has thus been reduced in accordance with the available data The justification for some analyses depends on the interpretation of the limited am6unt of data in such a way as to portray a co-herent sequence of synoptic events In spite of these factors surprisingly little alteration in the principal features of the circulation and temperature distribu-tion shown in the final analysis can be made without inordinately violating spine of the data In general the contours and isotherms -depicted are felt to be good approximations to the flow and temperature patterns at these levels Even so the same degree of accuracy that is found customarily in the analysis of charts at lower levels should not be expected

A contour interval of 320-geopotential meters (gpm) was used throughout- the year In addition

intermediate dashed contours were -used to outline

areas of relatively weak gradient especially during the spring and fall changeover periods Isotherms were drawn and labeled at 5C intervals

DISCUSSION OF THE 1968 CHARTS

The temperature and circulation anomalies assoshyciated with the major stratospheric warming that began in December 1967 (Johnson 1969 Staff 1970) persisted into the beginning of 1968 Maximum temperatures bad been observed at the end of Deshycember with a reversal of the normal wintertime temperature gradient between the North Pole and middle latitudes occurring first at the highest levels then proceeding downward to lower levels Thus at 5 mb on January 3 a wave-two pattern in the isoshytherms and contours was clearly seen with the warm air stretching over the Pole associated with -the two cyclones and with the cold air in the Bering Sea and the Atlantic Ocean associated with the two antishycyclones At 2 nib cold air had returned to the polar area with a warm aiea apparent over western Canada Hydrostatically consistent with this situation was a weakening of the circulation at 2 mb and a disapshypearance of the North Atlantic anticyclone at the 04-mb level with a strong anticyclone apparent in the eastern Pacific The major effects of the stratoshyspheric warming had thus diminished at the upper levels but were propagating downward with time and were still evident at lower altitudes By January 10 anticyclonic circulation dominated the polar reshygion at 5 and 2 mb but at 04 mb the polar cyclone had become reestablished During the next week the transition back to a relatively undisturbed westerly circulation could -be noted at 2 mb and by January 24 this became the pattern at the 5-mb level

During February the polar cyclone intensified at all levels but did not attain the depth reached before the warming The cold air at 5 and 2 mb was someshywhat displaced from the Pole toward northern Canada

- whereas at 04 mb warm air extending from northern Siberia dominated the polar area Although perturbashytions in the temperature fields at high latitudes were noted throughout February and March no significant departures from the basic westerly circulation of the polar vortex were observed The final springtime change from winter to sumshymer conditions could be seen at the end of March at 5 and 2 mrb A warm area was first seen north of Alaska and moved over the polar region In associashytion with the warm area anticyclonic circulation developed in mid-April over the Kamchatka-Alaska

4

region The anticyclonic circulation was displaced northward and an easterly circulation dominated the polar region by the end of April The cyclonic circulation with its associated cold westerlies was displaced southward during May as the polar anti-cyclone intensified and expanded By the end of May the middle and upper stratosphere over the entire Northern Hemisphere was under the influence of sum-mer easterly circulation with the warm air centered at the Pole

The summertime polar anticyclone warmed further during June and gradually intensified Peak tempera-ture and height at the Pole were reached toward the beginning of July with maximum wind reported near subtropical latitudes Thereafter the anticyclone de-cayed slowly as the duration of sunshine decreased in Arctic latitudes Cyclonic circulation formed in the polar area at the end of August and spread as the high latitudes cooled The easterly circulation was displaced southward in the form of cellular ridges reaching low latitudes at the end of September and merging into the subtropical circulation Thus by October westerly circulation predominated over mid-dIe and high latitudes of the Northern Hemisphere stratosphere in low latitudes a variable easterly circulation was associated with fluctuations of the position of the subtropical ridge

During October November and December the polar cyclone deepened accompanied by increasing westerly winds over most of the area However several eastward pulsations of the Aleutian anticy-clone resulted in disturbances of the westerly flow over Alaska and northwestern Canada The anti-cyclone first appeared on November 6 as a weak disturbance at 5 mb over the eastern Pacific By November 20 the anticyclone was found over Alaska at all analysis levels Rapid intensification as well as an eastward movement occurred during the next week affecting the circulation as far east as Fort Churchill Canada After the initial pulse the anti-cyclone retrograded but it persisted although less intense during the rest of December High tempera-

tures were seen during thisperiod in a warm ridge stretching from the Caribbean to southern Europe and across Asia to eastern Siberia This subtropical system sloped northward with height in hydrostatic response to the warm air at higher levels By Decemshyher 18 the warm air at 2 mb over southern Europe exhibited measured temperatures higher than OC At the same time the axis of cold air elongated and split with one center visible ov6r central Canada At the 04-mb level the data indicated a cbnsidershyably disturbed temperature field during the last week of the year with warm air-apparent over the polar region and cold air displaced southward

The principal features of the circulation during 1968 at five representative rocket launch sites may be seen in the time sections (figs 1-5) of analyzed height and temperature values extracted from the weekly charts The annual trend of the height and temperature values is most pronounced at the middleshyand higllatitude stations (figs 1-3) with the largest range of values occurring in the more northerly statiois (Johnson and Gelman 1968) Superimposed on this annual trend characterized by maximum values in summer and minimum values in winter are various perturbations The largest of these perturbashytions was in January and was associated with the major stratospheric warming mentioned above Smaller scale disturbances associated with movements of the Aleutian anticyclone were seen in November and December At the tropical station of Antigua West Indies Associated State (WIAS) the range of values is very small with only very minor perturbashytions affecting the station (fig 5) There is a sugshygestion however of a double maximum at the time of the equinoxes associated with the semiannual variashytion in temperature and wind and related to the seasonal migration of the subtropical anticyclone as seen in the charts At the subtropical station of White Sands N Me (fig 4) a combination of the major annual variation and the semiannual variation is apparent (This discussion prepared by Melvyn E Gelman)

5

ACKNOWLEDGMENTS

Funds for the analysis of the 1968 chart series were provided by the National Aeronautics and Space Administration under contract P 44664 (G)

Personnel actively engaged in the analysis projectwere Project Manager F G Finger Project Analyst

M E Gelman Research Consultant A 1 Miller Data Processing D L Griffith and J A Booth and Computer Operations K W Johnson

Ballard H N A Review of Seven Papers Concern-ing the Measurement of Temperature in the Stratosphere and Mesosphere ECOM 5125 US Army Electronics Command Fort Mon-mouth NJ May 1967 67 pp

Barr W Correctionsof RadiationalError of Radio-sonde Temperature Measurements in the Stratos-pher US Army Electronics Command Fort Monmouth NJ 1966 (personal communication)

Drews W A A Thermistor Arrangement to Im-prove Temperature Measurement at High Alti-tude NASA Contract Report 533 Aug 1966 29 pp

Environmental Science Services Administration Weather Bureau Constant Pressure Charts MF-494 National Weather Records Center Ashe-ville NC 1968

Finger F G Woolf H M and Anderson C E A Method for Objective Analysis of Stratos-pheric Constant-Pressure Charts Monthly Weather Review Vol 93 No 10 Oct 1965 pp 619-638

Finger F_ G Woolf H M and Anderson C E Synoptic Analyses of the 5- 2- and 04-Milli-bar Surfaces for the IQSY Period Monthly Weather Review Vol 94 No 11 Nov 1966 pp 651-661

Johnson K W A Preliminary Study of the Strato-spheric Warming of December 1967- January 1968 Monthly Weather Review Vol 97 No 8 Aug 1969 pp 553-564

Johnson K W and Gelman M E Temperature and Height Variability in the Middle and Upper Stratosphere During 1964-1966 as Determined From Constant Pressure Charts Monthly Weather Review Vol 96 No 6 June 1968 pp 371-382

Mclnturff R M and Finger F G The Compati-bility of Radiosonde Data at Stratospheric Levels

6

Over the Northern Hemisphere ESSA Techshynical Memorandum WBTM DATAC 2 Silver Spring Md Dec 1968 61 pp

Miers B T and Beyers N J Rocketsonde Wind and Temperature Measurements Between 30 and 70 Km for Selected Stations Journalof Applied Meteorolgy Vol 3 No 1 Feb 1964 pp 16-26

Miller A J A Note on the Variability of Ternshyperature as Indicated by Rocletsonde Thermisshytors Journal of Applied Meteorology Vol 8

No 1 Feb 1969 pp 172-174

Miller A J and Schmidlin F J Rocketsonde Repeatability and Stratospheric Variability Journal of Applied Meteorology Vol 10 No 2 April 1971 pp 320-327

Muench H S Temperature Measurements in the 30- to 40-Kilometer Region Monthly Weather Review Vol 99 No 2 Feb 1971 pp 158-160

Reed R J McKenzie D J and Vyverberg J C Diurnal Tidal Motions Between 30 and 60 Kilometers in Summer Journal of the Atmxrsshypheric Sciences Vol 23 No 4 July 1966 pp 416-423

Staff Upper Air Branch National Meteorological Center Weekly Synoptic Analyses 5- 2- and 04-Mb Surfaces for 1964 (Based on Observations of the Meteorological Rocket Network During the IQSY ESSA Technical Report WB 2 Silver Spring Md Apr 1967a 176 pp

Staff Upper Air Branch National Meteorological Center Weekly Synoptic Analyses 5- 2- and 04-Mb Surfaces for 1965 (Based on Observa tions of the Meteorological Rocket Network During the IQSY ESSA Technical Report WB 3 Silver Spring Md Aug 1967b 173 pp

Staff Upper Air Branch National Meteorological Center Weekly Synoptic Analyses 5- 2- and 04-Mb Surfaces for 1966 [Based on Mete orological Rocketsonde and High-Level Rawinshysonde Observations] ESSA Technical Report WB 9 Silver Spring Md Jan 1969 169 pp

Staff Upper Air Branch National Meteorological Center Weekly Synoptic Analyses 5- 2- and 04-Millibar Surfaces for 1967 (Based on Meteshyorological Rocketsonde and High-Level Rawinshysonde Observations) ESSA Technical Report WB 12 Silver Spring Md Jan 1970 169 pp

World Data Center A Meteorology Data Report Meteorological Rocket Network Firings 1968 Vol V National Weather Records Center Asheshyville NC 1969

58

57 H --TEMP X-x

56

55

54

53

52 x-1

51 X X-Xx 04M8BX 3

-5045 shy

44shy

43_ bull 42 xlXX-~ -x X--~ -xxlt--- x- ~~X-X

41 --X- _xXx -

-40 X 2M8 -JAN1396MO shy

54Wa JcV~Ax- - - - - - - - -X X X - - 50 II 37-13

36 - ~x-X-X-X-X_x_xxxx -0

534 X I -X-

3 17 31 14 28 13 27 07 94 8 22 5 19 3 T 31 14 28 11 25 9 23 6 20 4 18 7

JAN 1968 FEB MAR APR 10AY MN JUL AUG SEPT OCT NOV DEC 1968

FIGURE 1-Fort Greely Alaska (64000N 145044W) analyzed values extracted from weekly 5- 2- and 04-mb charts

TEMP x57

56

55

- _S3~~ X--ex- X-x-xxX-x-x-x- -0--^ X-x-xx-x-X x k X- X-XXx

52X N51 842MB 2x48 O -3-50

E M

Fia yda

54M

536X

37I -o

i-X-x X17-- xxX x lx 6 YX X xx X Xx -l -5040 --- 244B ILI Ix 1-Z

13 7 P I D 7

36 041 -307311327IpR X 8I

FEB MAR MAY 1I AVG SEPT OCT NOV DEC 1968

35 17 1142 8MAV 19 2

JAN 1968 _APR_ N

FIGURE 2--ort Churchill Canada (W4deg4N 9349W) analyzed values extracted fromn weekly 5- 2-and 04-rob charts

TEMP x-x

57

54 0

X-X~ 1 X-XXX---- -Xe X X--X -x----NX -20 04MB

c44

-43 -1311P

47 x-x tx A e Xx x -20

5MB

36-1035 -0 -fX--Xx-x-X--X- - Xx-x-X-X-X XXx x shyx- X -x- xx IIIIx- ~x yy X- 30 x-X - Xx x-X-X -x -X x-x-U

IxIIF 1 1T1 1 1 1l I 1 1 l I 1 1 1 1 1 1 I Io X I 1 1 1 1 1 1 I I-fU I 3 1731 4 28 1327 0 24 8 22 19 3 17 31 4 28 125 9 23 6 20 4 8 - dAN 1968 FEB MAR APR MAY JUN JUL AUG SEPT OCT NOV DEC 1968

I FIGURE 3-Walops Island Va (370 50N75 029W) analyzed values extracted from weekly 5 2- and 04-mb charts

Contents PAGE

Introduction --------- ----------------- ------ -------- ----------------- ------ ------ 1

Processing of rawinsonde data ---------------------------------------------------- 1

Processing of rocketsonde data ----------------------------------------------------

Station Model and Reporting Rocket Stations ---------------------------------------- 13

2

Analysis procedure ------------------------------------------------------------- 3

Discussion of the 1968 charts ----------------------------------------------------- 4

Acknowledgments --------------------------------------------------------------- 6

References -------------------------------------------------------------------- 6

Weekly 5- 2- and 04-mb synoptic charts ------------------------------------------- 14169

LIST OF ILLUSTRATIONS

rIGURE

1 Analyzed values from weekly charts at Fort Greely ---------------------------------- 7

2 Analyzed values from weekly charts at Fort Churchill ------------------------------- 8

3 Analyzed values from weekly charts at Wallops Island ------------------------------ 9

4 Analyzed values from weekly charts at White Sands -------------------------------- 10

5 Analyzed values from weekly charts at Antigua ------------------------------------ 11

iii

Weekly Synoptic Analyses 5- 2- and 04-Millibar Surfaces for 1968

(Based on meteorological rocketsonde and high-level rawinsonde observations)

STAFF UPPER AIR BRANCH

National Meteorological Center NOAA Hillcrest Heights Md

ABSTRACT Data from meteorological rocketsonde and rawinsonde observations have been employed to analyze a series of high-altitude synoptic charts Methods employed for processhysing the various types of data and the analysis procedure used are described

Broad-scale analyses of the 5- 2- and 04 mb surfaces primarily covering North America and adjacent ocean areas are presented at weekly intervals for 1968 A brief discussion of the height and temperature fields is also given Circulation and temperature changes associated with a major stratospheric warming during January are among the discussion items

INTRODUCTION

This volume represents the fifth in a series of con-stant-pressure charts for the upper stratosphere based on rocketsonde and very high level rawinsonde data obtained over North America and adjacent ocean areas These charts have been analyzed by the Upper Air Branch of the National Weather Services National Meteorological Center (Staff 1967a 1967b 1969 1970)

At 5 mb both rawinsonde and rocketsonde data were used to derive the height and temperature fields Above 5 mb rawinsonde data were seldom available and rocket observations constituted the basic data source The Station Model and Reporting Rocket Stations chart (p 13) shows the locations of 20 meteorological rocket launch sites within the map analysis area for which data were available -in 1968

The present series of analyses at weekly intervals includes charts for the 5- 2- and 04-mb surfaces (approximately 36 42 and 55 kin respectively) nominally representing broad-scale synoptic conditions

on each Wednesday of the analysis period In addition to a description of the techniques employed in obtainshying these charts a brief discussion of large-scale features is also included

PROCESSING OF RAWINSONDE DATA

The preparation of high-level data for analysis presents many problems Some of the difficulties enshycountered in the use of rawinsonde information such as achieving compatibility between daytime and nightshytime observations extrapolation and interpolation of data and identification of erroneous reports have been summarized previously (Finger et al 1965 1966)

Temperature and height adjustments designed to compensate for instrumental radiation errors were apshyplied to all 5-mb rawinsonde reports Initially an adshyjustment was made which reduced values from daytime observations to the level of those values reported from nighttime observations Magnitudes of these day-night adjustments which are intended to account for the

1

effects of solar heating on the rod thermitor were 2- and 04-mb surfaces was as follows determined with the aid of a computer program that calculated monthly mean differences between reported daylight and darkness values Input to this program consisted of all available 5-mb data for 1964 and 1967 from stations in North America and adjacent ocean areas that employ US outrigger-type radiosonde in-struments (for details of the adjustment and further references see Mclnturff and Finger 1968)

Theoretical and laboratory studies of the rod thermistor used in present-day radiosondes indicated that a significant error may be induced by infrared cooling at stratospheric levels above about 10 mb Therefore a second adjustment (Barr 1966) was added to all reported 5-mb data including observa-tions made actually in darkness and daytime data that had been adjusted for solar-radiation error The magnitude of the temperature correction is a function of reported temperature while the height adjustment varies linearly with the temperature correction

Rawinsonde data utilized for the 5-mb charts were processed by computer methods Inputs to the com-puter program consisted of observations from North America and adjacent oceanareas for 7- 5- 4- and 3-mb levels in the form of punched cards obtained from the National Weather Records Center Output listings included all observations for 1 week at each station Data for levels other than 5 mb were also listed to supply the analyst with as much suppleshymentary information as possible Thermal winds and

corresponding horizontal temperature gradients were computed for the layers from 7 to 5 7 to 4 and 5 to 4 nib

After processing the rawinsonde-derived tempera-ture height wind and thermal wind were plotted on work charts For charts presented in this publication the rawinsonde data have been omitted for the sake of legibility

PROCESSING OF ROCKETSONDE DATA

Winds and termperatures measured by rocketsonde systems comprised the basic data sample for analyses at the 2- and 04-mb levels and were also used in combination with rawinsonde data for the 5-mb charts Rocketsonde information was obtained for this proj-ect in the form of magnetic tape identical in format to published information contained in the Meteorolog-ical Rocket Network (MRN) Firings (World Data Center A 1969)

The procedure for extraction of rocketsonde in-formation and for computation of heights of the 5

a Wind and temperature profiles were processed by a computer program designed to reduce the amplitude of rapid oscillations in the vertical by using a simple (1-2-1) smoothing technique This processing was done because analyses are intended to portray only the broad-scale stratoshyspheric features

b Temperatures were modified above 40 km in accordance with Drews (1966) publication one of several theoretical studies (see the review article by Ballard 1967) For the Areasonde IA the instrument most widely employed during 1968 the correction applied to the temperature profiles increased from PdegC at 42 km to about 9degC at 58 km

cAn initial estimate of the geopotential height for each station at the respective pressure levels (5 2 and 04 mb) had to be made before the temperature for that particular level could be

selected This estimate was obtained by deriving the temporal trend of the geopotential height for the station from the lower level analyzed charts and by applying this trend to the geopotential height for the station as shown by the previously analyzed chart The temperature at this estishymated height was then extracted from the ternshyperature profile

d The true geopotential height of the pressure surface at each station was then hydrostatically computed for each available temperature profile This height was obtained by deriving a layershymean temperature between the extracted tershyperature of the upper level and the temperature obtained from the previously completed lower

level analysis Computer-analyzed 10-ob charts (Environmental Science Services Administration 1968) based exclusively on rawinsonde data were used as foundation for hydrostatic compushytation of the height of the 5-mb surface For the 5- and 2-mb levels a constant lapse rate was considered representative However because a temperature maximum (associated with the stratashypause) usually exists between 2 and 04 nib mean temperatures were derived by usifig values exshytracted at each whole kilometer between these two pressure levels

e Wind components were extracted from the smoothed profiles at the height of the constantshypressure surface and a resultant wind was cornshyputed

2

f Thermal winds were determined for 6-kn layers surrounding each pressure surface at the report-ing station

The rooketsonde data (temperature height wind direction and speed and thermal wind) were plotted on work charts On the charts presented for publica-tion three observations are shown when available for each station Heights and thermal winds have been omitted for the sake of legibility The Station Model and Reporting Rocket Stations chart illustrates the symbols used to distinguish the data obtained on Wednesdays from off-time data

ANALYSIS PROCEDURE

Conventional techniques including differential a tnalysistechs construct t -2-m wdnierenused ilanalysis methods were used to construct the 5- 2-

and 04-mb charts H~owever because of the sparsity

of observations data acquired for the entire week were

examined to dtriethe synoptic changes that took petaingplace during the week Thus conditions pertaining

to Wednesday the analysis day were deduced The analysis system consisted of the following

steps

a Isotherms were derived using both processed rocketsonde and rawinsonde temperatures where available In spite of the corrections applied to the 5-mb rawinsonde temperature data large differences could sometimes be seen when corn-paring rocketsonde data that were close in time and distance (Muench 1971) Generally the problem could be resolved by giving greater weight to rawinsonde stations employing hyp-someters In a few cases the difficulty even oc-curred with hypsometer radiosondes therefore some compromise value had to be chosen usu-ally closer to the rocketsonde-reported temper-ature Computed thermal winds were especially useful in determining horizontal temperature gradients and the relative location of warm and cold areas Where possible time-height sections of temperature were plotted as a further aid in deriving the isotherms

bA mean temperature field representative of the layer between the previously analyzed lower sur-face and the selected surface was derived graph-ically This mean field represents a geopotential thi6kness which when added to the lower level height field yields a smooth conservative first approximation to the contour pattern at th6 upper surface

c Reported winds and computed heights for indishyvidual stations were then used to adjust the first approximation of the contour field using the assumption of geostrophic flow Winds were acshycorded the highest priority for this adjustment When large adjustments were made to the conshytour field the temperature field was then adshyjusted to maintain hydrostatic consistency

d The analysis was reviewed for vertical and temshyporal consistency For example circulation censhyters ridges and troughs were examined with the aid of all available data to verify vertical slope and movement with time Time-height secshytions and height-change charts were especially useful for these purposes

The above procedures appear to produce excellent results at 5 mb and were successfully applied to ohshytain the 2- and 04-mb charts Generally only slightadjustments of the first-approximation height fields

were necessa at the 5- and 2-mb levels However

wrtierncsaya h -ad -blvlHwvr rather formidable analysis problems were evident atthe 04-mb level One problem arises from the apparshyent intersection of the stratopause with the 04-mb level Because the normal stratospheric temperature inversion ceases at the stratopause level the graphical method for obtaining mean temperature which deshypends on the existence of a linear profile is no longer valid Large adjustments must be made especially at lower latitudes in the graphically derived height field to conform with the computed height-at each station (as discussed in the previous section)

Another difficulty was the apparent occurrence of large day-to-day temperature changes at times exceedshying 10C (Miller 1969) and persistent oscillations in many wind profiles In most cases deviations of reported temperatures and winds from one another could be accounted for by identifiable rapid largeshyscale synoptic changes Sometimes reports within a few hours of each other at a single station exhibited temperature changes of 5 to 70 C over a limited height interval near the stratopause It has been shown that such small-scale subsynoptie changes are possible at these levels (Miller and Schmidlin 1971) Thus some intermediate value was chosen for analyshy

sis to represent the value on the analysis day Ocshycasionally it was impossible to make a reasonable reconciliation of reported station values

An additional problem is encountered in the sumshymer charts During that season circulation at the upper surfaces (2 and 0 mb) would be expected to follow the pattern established for lower levels that is a rather uniform easterly flow about an anticyclone

3

centered at or very near the North Pole However on- a typical summertime 04-mb chart most reported rocketsonde winds exhibit significant southerly corn-ponents If these winds- were to be given full weight in the analysis the resulting pattern would consist of contours oriented from- southeast to northwest spiraling toward a high center located apparently over northern Europe

The prevalence of positive meridional components in summertime rocketsonde winds has been noted previously (Miers and Beyers 1964) Studies (Reed et al 1966) based on MRN data for several summers have demonstrated that the meridional wind corn-ponent resulting from the diurnal tide reaches maxi-mum southerly strength at about noon local time Because most MRN firings occur near local noon

the measured winds naturally contain this component Although no adjustments were made in individual reports the analysis procedure includes suitable compensation Differences in the reported winds and orientation of the contours may be quite pronounced especially on the summertime charts Strong westerly winds of winter usually mask the weak diurnal com-ponent but there is a possibility that this component may contribute to some bias in analysis during periods of weak circulation

Although careful consideration of high-level data allows a broad-scale depiction of circulation patterns up to 04 rb the -sparsity of reports requires an increasing amount of subjectivity as the analysis pro-ceeds to this high level As yet the analyst has little in the way of synoptic models for guidance with respect to the probable contour and isotherm patterns and the phase relation between these patterns in areas of sparse data The geographical area of analy-sis for the charts has thus been reduced in accordance with the available data The justification for some analyses depends on the interpretation of the limited am6unt of data in such a way as to portray a co-herent sequence of synoptic events In spite of these factors surprisingly little alteration in the principal features of the circulation and temperature distribu-tion shown in the final analysis can be made without inordinately violating spine of the data In general the contours and isotherms -depicted are felt to be good approximations to the flow and temperature patterns at these levels Even so the same degree of accuracy that is found customarily in the analysis of charts at lower levels should not be expected

A contour interval of 320-geopotential meters (gpm) was used throughout- the year In addition

intermediate dashed contours were -used to outline

areas of relatively weak gradient especially during the spring and fall changeover periods Isotherms were drawn and labeled at 5C intervals

DISCUSSION OF THE 1968 CHARTS

The temperature and circulation anomalies assoshyciated with the major stratospheric warming that began in December 1967 (Johnson 1969 Staff 1970) persisted into the beginning of 1968 Maximum temperatures bad been observed at the end of Deshycember with a reversal of the normal wintertime temperature gradient between the North Pole and middle latitudes occurring first at the highest levels then proceeding downward to lower levels Thus at 5 mb on January 3 a wave-two pattern in the isoshytherms and contours was clearly seen with the warm air stretching over the Pole associated with -the two cyclones and with the cold air in the Bering Sea and the Atlantic Ocean associated with the two antishycyclones At 2 nib cold air had returned to the polar area with a warm aiea apparent over western Canada Hydrostatically consistent with this situation was a weakening of the circulation at 2 mb and a disapshypearance of the North Atlantic anticyclone at the 04-mb level with a strong anticyclone apparent in the eastern Pacific The major effects of the stratoshyspheric warming had thus diminished at the upper levels but were propagating downward with time and were still evident at lower altitudes By January 10 anticyclonic circulation dominated the polar reshygion at 5 and 2 mb but at 04 mb the polar cyclone had become reestablished During the next week the transition back to a relatively undisturbed westerly circulation could -be noted at 2 mb and by January 24 this became the pattern at the 5-mb level

During February the polar cyclone intensified at all levels but did not attain the depth reached before the warming The cold air at 5 and 2 mb was someshywhat displaced from the Pole toward northern Canada

- whereas at 04 mb warm air extending from northern Siberia dominated the polar area Although perturbashytions in the temperature fields at high latitudes were noted throughout February and March no significant departures from the basic westerly circulation of the polar vortex were observed The final springtime change from winter to sumshymer conditions could be seen at the end of March at 5 and 2 mrb A warm area was first seen north of Alaska and moved over the polar region In associashytion with the warm area anticyclonic circulation developed in mid-April over the Kamchatka-Alaska

4

region The anticyclonic circulation was displaced northward and an easterly circulation dominated the polar region by the end of April The cyclonic circulation with its associated cold westerlies was displaced southward during May as the polar anti-cyclone intensified and expanded By the end of May the middle and upper stratosphere over the entire Northern Hemisphere was under the influence of sum-mer easterly circulation with the warm air centered at the Pole

The summertime polar anticyclone warmed further during June and gradually intensified Peak tempera-ture and height at the Pole were reached toward the beginning of July with maximum wind reported near subtropical latitudes Thereafter the anticyclone de-cayed slowly as the duration of sunshine decreased in Arctic latitudes Cyclonic circulation formed in the polar area at the end of August and spread as the high latitudes cooled The easterly circulation was displaced southward in the form of cellular ridges reaching low latitudes at the end of September and merging into the subtropical circulation Thus by October westerly circulation predominated over mid-dIe and high latitudes of the Northern Hemisphere stratosphere in low latitudes a variable easterly circulation was associated with fluctuations of the position of the subtropical ridge

During October November and December the polar cyclone deepened accompanied by increasing westerly winds over most of the area However several eastward pulsations of the Aleutian anticy-clone resulted in disturbances of the westerly flow over Alaska and northwestern Canada The anti-cyclone first appeared on November 6 as a weak disturbance at 5 mb over the eastern Pacific By November 20 the anticyclone was found over Alaska at all analysis levels Rapid intensification as well as an eastward movement occurred during the next week affecting the circulation as far east as Fort Churchill Canada After the initial pulse the anti-cyclone retrograded but it persisted although less intense during the rest of December High tempera-

tures were seen during thisperiod in a warm ridge stretching from the Caribbean to southern Europe and across Asia to eastern Siberia This subtropical system sloped northward with height in hydrostatic response to the warm air at higher levels By Decemshyher 18 the warm air at 2 mb over southern Europe exhibited measured temperatures higher than OC At the same time the axis of cold air elongated and split with one center visible ov6r central Canada At the 04-mb level the data indicated a cbnsidershyably disturbed temperature field during the last week of the year with warm air-apparent over the polar region and cold air displaced southward

The principal features of the circulation during 1968 at five representative rocket launch sites may be seen in the time sections (figs 1-5) of analyzed height and temperature values extracted from the weekly charts The annual trend of the height and temperature values is most pronounced at the middleshyand higllatitude stations (figs 1-3) with the largest range of values occurring in the more northerly statiois (Johnson and Gelman 1968) Superimposed on this annual trend characterized by maximum values in summer and minimum values in winter are various perturbations The largest of these perturbashytions was in January and was associated with the major stratospheric warming mentioned above Smaller scale disturbances associated with movements of the Aleutian anticyclone were seen in November and December At the tropical station of Antigua West Indies Associated State (WIAS) the range of values is very small with only very minor perturbashytions affecting the station (fig 5) There is a sugshygestion however of a double maximum at the time of the equinoxes associated with the semiannual variashytion in temperature and wind and related to the seasonal migration of the subtropical anticyclone as seen in the charts At the subtropical station of White Sands N Me (fig 4) a combination of the major annual variation and the semiannual variation is apparent (This discussion prepared by Melvyn E Gelman)

5

ACKNOWLEDGMENTS

Funds for the analysis of the 1968 chart series were provided by the National Aeronautics and Space Administration under contract P 44664 (G)

Personnel actively engaged in the analysis projectwere Project Manager F G Finger Project Analyst

M E Gelman Research Consultant A 1 Miller Data Processing D L Griffith and J A Booth and Computer Operations K W Johnson

Ballard H N A Review of Seven Papers Concern-ing the Measurement of Temperature in the Stratosphere and Mesosphere ECOM 5125 US Army Electronics Command Fort Mon-mouth NJ May 1967 67 pp

Barr W Correctionsof RadiationalError of Radio-sonde Temperature Measurements in the Stratos-pher US Army Electronics Command Fort Monmouth NJ 1966 (personal communication)

Drews W A A Thermistor Arrangement to Im-prove Temperature Measurement at High Alti-tude NASA Contract Report 533 Aug 1966 29 pp

Environmental Science Services Administration Weather Bureau Constant Pressure Charts MF-494 National Weather Records Center Ashe-ville NC 1968

Finger F G Woolf H M and Anderson C E A Method for Objective Analysis of Stratos-pheric Constant-Pressure Charts Monthly Weather Review Vol 93 No 10 Oct 1965 pp 619-638

Finger F_ G Woolf H M and Anderson C E Synoptic Analyses of the 5- 2- and 04-Milli-bar Surfaces for the IQSY Period Monthly Weather Review Vol 94 No 11 Nov 1966 pp 651-661

Johnson K W A Preliminary Study of the Strato-spheric Warming of December 1967- January 1968 Monthly Weather Review Vol 97 No 8 Aug 1969 pp 553-564

Johnson K W and Gelman M E Temperature and Height Variability in the Middle and Upper Stratosphere During 1964-1966 as Determined From Constant Pressure Charts Monthly Weather Review Vol 96 No 6 June 1968 pp 371-382

Mclnturff R M and Finger F G The Compati-bility of Radiosonde Data at Stratospheric Levels

6

Over the Northern Hemisphere ESSA Techshynical Memorandum WBTM DATAC 2 Silver Spring Md Dec 1968 61 pp

Miers B T and Beyers N J Rocketsonde Wind and Temperature Measurements Between 30 and 70 Km for Selected Stations Journalof Applied Meteorolgy Vol 3 No 1 Feb 1964 pp 16-26

Miller A J A Note on the Variability of Ternshyperature as Indicated by Rocletsonde Thermisshytors Journal of Applied Meteorology Vol 8

No 1 Feb 1969 pp 172-174

Miller A J and Schmidlin F J Rocketsonde Repeatability and Stratospheric Variability Journal of Applied Meteorology Vol 10 No 2 April 1971 pp 320-327

Muench H S Temperature Measurements in the 30- to 40-Kilometer Region Monthly Weather Review Vol 99 No 2 Feb 1971 pp 158-160

Reed R J McKenzie D J and Vyverberg J C Diurnal Tidal Motions Between 30 and 60 Kilometers in Summer Journal of the Atmxrsshypheric Sciences Vol 23 No 4 July 1966 pp 416-423

Staff Upper Air Branch National Meteorological Center Weekly Synoptic Analyses 5- 2- and 04-Mb Surfaces for 1964 (Based on Observations of the Meteorological Rocket Network During the IQSY ESSA Technical Report WB 2 Silver Spring Md Apr 1967a 176 pp

Staff Upper Air Branch National Meteorological Center Weekly Synoptic Analyses 5- 2- and 04-Mb Surfaces for 1965 (Based on Observa tions of the Meteorological Rocket Network During the IQSY ESSA Technical Report WB 3 Silver Spring Md Aug 1967b 173 pp

Staff Upper Air Branch National Meteorological Center Weekly Synoptic Analyses 5- 2- and 04-Mb Surfaces for 1966 [Based on Mete orological Rocketsonde and High-Level Rawinshysonde Observations] ESSA Technical Report WB 9 Silver Spring Md Jan 1969 169 pp

Staff Upper Air Branch National Meteorological Center Weekly Synoptic Analyses 5- 2- and 04-Millibar Surfaces for 1967 (Based on Meteshyorological Rocketsonde and High-Level Rawinshysonde Observations) ESSA Technical Report WB 12 Silver Spring Md Jan 1970 169 pp

World Data Center A Meteorology Data Report Meteorological Rocket Network Firings 1968 Vol V National Weather Records Center Asheshyville NC 1969

58

57 H --TEMP X-x

56

55

54

53

52 x-1

51 X X-Xx 04M8BX 3

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44shy

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36 - ~x-X-X-X-X_x_xxxx -0

534 X I -X-

3 17 31 14 28 13 27 07 94 8 22 5 19 3 T 31 14 28 11 25 9 23 6 20 4 18 7

JAN 1968 FEB MAR APR 10AY MN JUL AUG SEPT OCT NOV DEC 1968

FIGURE 1-Fort Greely Alaska (64000N 145044W) analyzed values extracted from weekly 5- 2- and 04-mb charts

TEMP x57

56

55

- _S3~~ X--ex- X-x-xxX-x-x-x- -0--^ X-x-xx-x-X x k X- X-XXx

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37I -o

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13 7 P I D 7

36 041 -307311327IpR X 8I

FEB MAR MAY 1I AVG SEPT OCT NOV DEC 1968

35 17 1142 8MAV 19 2

JAN 1968 _APR_ N

FIGURE 2--ort Churchill Canada (W4deg4N 9349W) analyzed values extracted fromn weekly 5- 2-and 04-rob charts

TEMP x-x

57

54 0

X-X~ 1 X-XXX---- -Xe X X--X -x----NX -20 04MB

c44

-43 -1311P

47 x-x tx A e Xx x -20

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IxIIF 1 1T1 1 1 1l I 1 1 l I 1 1 1 1 1 1 I Io X I 1 1 1 1 1 1 I I-fU I 3 1731 4 28 1327 0 24 8 22 19 3 17 31 4 28 125 9 23 6 20 4 8 - dAN 1968 FEB MAR APR MAY JUN JUL AUG SEPT OCT NOV DEC 1968

I FIGURE 3-Walops Island Va (370 50N75 029W) analyzed values extracted from weekly 5 2- and 04-mb charts

Weekly Synoptic Analyses 5- 2- and 04-Millibar Surfaces for 1968

(Based on meteorological rocketsonde and high-level rawinsonde observations)

STAFF UPPER AIR BRANCH

National Meteorological Center NOAA Hillcrest Heights Md

ABSTRACT Data from meteorological rocketsonde and rawinsonde observations have been employed to analyze a series of high-altitude synoptic charts Methods employed for processhysing the various types of data and the analysis procedure used are described

Broad-scale analyses of the 5- 2- and 04 mb surfaces primarily covering North America and adjacent ocean areas are presented at weekly intervals for 1968 A brief discussion of the height and temperature fields is also given Circulation and temperature changes associated with a major stratospheric warming during January are among the discussion items

INTRODUCTION

This volume represents the fifth in a series of con-stant-pressure charts for the upper stratosphere based on rocketsonde and very high level rawinsonde data obtained over North America and adjacent ocean areas These charts have been analyzed by the Upper Air Branch of the National Weather Services National Meteorological Center (Staff 1967a 1967b 1969 1970)

At 5 mb both rawinsonde and rocketsonde data were used to derive the height and temperature fields Above 5 mb rawinsonde data were seldom available and rocket observations constituted the basic data source The Station Model and Reporting Rocket Stations chart (p 13) shows the locations of 20 meteorological rocket launch sites within the map analysis area for which data were available -in 1968

The present series of analyses at weekly intervals includes charts for the 5- 2- and 04-mb surfaces (approximately 36 42 and 55 kin respectively) nominally representing broad-scale synoptic conditions

on each Wednesday of the analysis period In addition to a description of the techniques employed in obtainshying these charts a brief discussion of large-scale features is also included

PROCESSING OF RAWINSONDE DATA

The preparation of high-level data for analysis presents many problems Some of the difficulties enshycountered in the use of rawinsonde information such as achieving compatibility between daytime and nightshytime observations extrapolation and interpolation of data and identification of erroneous reports have been summarized previously (Finger et al 1965 1966)

Temperature and height adjustments designed to compensate for instrumental radiation errors were apshyplied to all 5-mb rawinsonde reports Initially an adshyjustment was made which reduced values from daytime observations to the level of those values reported from nighttime observations Magnitudes of these day-night adjustments which are intended to account for the

1

effects of solar heating on the rod thermitor were 2- and 04-mb surfaces was as follows determined with the aid of a computer program that calculated monthly mean differences between reported daylight and darkness values Input to this program consisted of all available 5-mb data for 1964 and 1967 from stations in North America and adjacent ocean areas that employ US outrigger-type radiosonde in-struments (for details of the adjustment and further references see Mclnturff and Finger 1968)

Theoretical and laboratory studies of the rod thermistor used in present-day radiosondes indicated that a significant error may be induced by infrared cooling at stratospheric levels above about 10 mb Therefore a second adjustment (Barr 1966) was added to all reported 5-mb data including observa-tions made actually in darkness and daytime data that had been adjusted for solar-radiation error The magnitude of the temperature correction is a function of reported temperature while the height adjustment varies linearly with the temperature correction

Rawinsonde data utilized for the 5-mb charts were processed by computer methods Inputs to the com-puter program consisted of observations from North America and adjacent oceanareas for 7- 5- 4- and 3-mb levels in the form of punched cards obtained from the National Weather Records Center Output listings included all observations for 1 week at each station Data for levels other than 5 mb were also listed to supply the analyst with as much suppleshymentary information as possible Thermal winds and

corresponding horizontal temperature gradients were computed for the layers from 7 to 5 7 to 4 and 5 to 4 nib

After processing the rawinsonde-derived tempera-ture height wind and thermal wind were plotted on work charts For charts presented in this publication the rawinsonde data have been omitted for the sake of legibility

PROCESSING OF ROCKETSONDE DATA

Winds and termperatures measured by rocketsonde systems comprised the basic data sample for analyses at the 2- and 04-mb levels and were also used in combination with rawinsonde data for the 5-mb charts Rocketsonde information was obtained for this proj-ect in the form of magnetic tape identical in format to published information contained in the Meteorolog-ical Rocket Network (MRN) Firings (World Data Center A 1969)

The procedure for extraction of rocketsonde in-formation and for computation of heights of the 5

a Wind and temperature profiles were processed by a computer program designed to reduce the amplitude of rapid oscillations in the vertical by using a simple (1-2-1) smoothing technique This processing was done because analyses are intended to portray only the broad-scale stratoshyspheric features

b Temperatures were modified above 40 km in accordance with Drews (1966) publication one of several theoretical studies (see the review article by Ballard 1967) For the Areasonde IA the instrument most widely employed during 1968 the correction applied to the temperature profiles increased from PdegC at 42 km to about 9degC at 58 km

cAn initial estimate of the geopotential height for each station at the respective pressure levels (5 2 and 04 mb) had to be made before the temperature for that particular level could be

selected This estimate was obtained by deriving the temporal trend of the geopotential height for the station from the lower level analyzed charts and by applying this trend to the geopotential height for the station as shown by the previously analyzed chart The temperature at this estishymated height was then extracted from the ternshyperature profile

d The true geopotential height of the pressure surface at each station was then hydrostatically computed for each available temperature profile This height was obtained by deriving a layershymean temperature between the extracted tershyperature of the upper level and the temperature obtained from the previously completed lower

level analysis Computer-analyzed 10-ob charts (Environmental Science Services Administration 1968) based exclusively on rawinsonde data were used as foundation for hydrostatic compushytation of the height of the 5-mb surface For the 5- and 2-mb levels a constant lapse rate was considered representative However because a temperature maximum (associated with the stratashypause) usually exists between 2 and 04 nib mean temperatures were derived by usifig values exshytracted at each whole kilometer between these two pressure levels

e Wind components were extracted from the smoothed profiles at the height of the constantshypressure surface and a resultant wind was cornshyputed

2

f Thermal winds were determined for 6-kn layers surrounding each pressure surface at the report-ing station

The rooketsonde data (temperature height wind direction and speed and thermal wind) were plotted on work charts On the charts presented for publica-tion three observations are shown when available for each station Heights and thermal winds have been omitted for the sake of legibility The Station Model and Reporting Rocket Stations chart illustrates the symbols used to distinguish the data obtained on Wednesdays from off-time data

ANALYSIS PROCEDURE

Conventional techniques including differential a tnalysistechs construct t -2-m wdnierenused ilanalysis methods were used to construct the 5- 2-

and 04-mb charts H~owever because of the sparsity

of observations data acquired for the entire week were

examined to dtriethe synoptic changes that took petaingplace during the week Thus conditions pertaining

to Wednesday the analysis day were deduced The analysis system consisted of the following

steps

a Isotherms were derived using both processed rocketsonde and rawinsonde temperatures where available In spite of the corrections applied to the 5-mb rawinsonde temperature data large differences could sometimes be seen when corn-paring rocketsonde data that were close in time and distance (Muench 1971) Generally the problem could be resolved by giving greater weight to rawinsonde stations employing hyp-someters In a few cases the difficulty even oc-curred with hypsometer radiosondes therefore some compromise value had to be chosen usu-ally closer to the rocketsonde-reported temper-ature Computed thermal winds were especially useful in determining horizontal temperature gradients and the relative location of warm and cold areas Where possible time-height sections of temperature were plotted as a further aid in deriving the isotherms

bA mean temperature field representative of the layer between the previously analyzed lower sur-face and the selected surface was derived graph-ically This mean field represents a geopotential thi6kness which when added to the lower level height field yields a smooth conservative first approximation to the contour pattern at th6 upper surface

c Reported winds and computed heights for indishyvidual stations were then used to adjust the first approximation of the contour field using the assumption of geostrophic flow Winds were acshycorded the highest priority for this adjustment When large adjustments were made to the conshytour field the temperature field was then adshyjusted to maintain hydrostatic consistency

d The analysis was reviewed for vertical and temshyporal consistency For example circulation censhyters ridges and troughs were examined with the aid of all available data to verify vertical slope and movement with time Time-height secshytions and height-change charts were especially useful for these purposes

The above procedures appear to produce excellent results at 5 mb and were successfully applied to ohshytain the 2- and 04-mb charts Generally only slightadjustments of the first-approximation height fields

were necessa at the 5- and 2-mb levels However

wrtierncsaya h -ad -blvlHwvr rather formidable analysis problems were evident atthe 04-mb level One problem arises from the apparshyent intersection of the stratopause with the 04-mb level Because the normal stratospheric temperature inversion ceases at the stratopause level the graphical method for obtaining mean temperature which deshypends on the existence of a linear profile is no longer valid Large adjustments must be made especially at lower latitudes in the graphically derived height field to conform with the computed height-at each station (as discussed in the previous section)

Another difficulty was the apparent occurrence of large day-to-day temperature changes at times exceedshying 10C (Miller 1969) and persistent oscillations in many wind profiles In most cases deviations of reported temperatures and winds from one another could be accounted for by identifiable rapid largeshyscale synoptic changes Sometimes reports within a few hours of each other at a single station exhibited temperature changes of 5 to 70 C over a limited height interval near the stratopause It has been shown that such small-scale subsynoptie changes are possible at these levels (Miller and Schmidlin 1971) Thus some intermediate value was chosen for analyshy

sis to represent the value on the analysis day Ocshycasionally it was impossible to make a reasonable reconciliation of reported station values

An additional problem is encountered in the sumshymer charts During that season circulation at the upper surfaces (2 and 0 mb) would be expected to follow the pattern established for lower levels that is a rather uniform easterly flow about an anticyclone

3

centered at or very near the North Pole However on- a typical summertime 04-mb chart most reported rocketsonde winds exhibit significant southerly corn-ponents If these winds- were to be given full weight in the analysis the resulting pattern would consist of contours oriented from- southeast to northwest spiraling toward a high center located apparently over northern Europe

The prevalence of positive meridional components in summertime rocketsonde winds has been noted previously (Miers and Beyers 1964) Studies (Reed et al 1966) based on MRN data for several summers have demonstrated that the meridional wind corn-ponent resulting from the diurnal tide reaches maxi-mum southerly strength at about noon local time Because most MRN firings occur near local noon

the measured winds naturally contain this component Although no adjustments were made in individual reports the analysis procedure includes suitable compensation Differences in the reported winds and orientation of the contours may be quite pronounced especially on the summertime charts Strong westerly winds of winter usually mask the weak diurnal com-ponent but there is a possibility that this component may contribute to some bias in analysis during periods of weak circulation

Although careful consideration of high-level data allows a broad-scale depiction of circulation patterns up to 04 rb the -sparsity of reports requires an increasing amount of subjectivity as the analysis pro-ceeds to this high level As yet the analyst has little in the way of synoptic models for guidance with respect to the probable contour and isotherm patterns and the phase relation between these patterns in areas of sparse data The geographical area of analy-sis for the charts has thus been reduced in accordance with the available data The justification for some analyses depends on the interpretation of the limited am6unt of data in such a way as to portray a co-herent sequence of synoptic events In spite of these factors surprisingly little alteration in the principal features of the circulation and temperature distribu-tion shown in the final analysis can be made without inordinately violating spine of the data In general the contours and isotherms -depicted are felt to be good approximations to the flow and temperature patterns at these levels Even so the same degree of accuracy that is found customarily in the analysis of charts at lower levels should not be expected

A contour interval of 320-geopotential meters (gpm) was used throughout- the year In addition

intermediate dashed contours were -used to outline

areas of relatively weak gradient especially during the spring and fall changeover periods Isotherms were drawn and labeled at 5C intervals

DISCUSSION OF THE 1968 CHARTS

The temperature and circulation anomalies assoshyciated with the major stratospheric warming that began in December 1967 (Johnson 1969 Staff 1970) persisted into the beginning of 1968 Maximum temperatures bad been observed at the end of Deshycember with a reversal of the normal wintertime temperature gradient between the North Pole and middle latitudes occurring first at the highest levels then proceeding downward to lower levels Thus at 5 mb on January 3 a wave-two pattern in the isoshytherms and contours was clearly seen with the warm air stretching over the Pole associated with -the two cyclones and with the cold air in the Bering Sea and the Atlantic Ocean associated with the two antishycyclones At 2 nib cold air had returned to the polar area with a warm aiea apparent over western Canada Hydrostatically consistent with this situation was a weakening of the circulation at 2 mb and a disapshypearance of the North Atlantic anticyclone at the 04-mb level with a strong anticyclone apparent in the eastern Pacific The major effects of the stratoshyspheric warming had thus diminished at the upper levels but were propagating downward with time and were still evident at lower altitudes By January 10 anticyclonic circulation dominated the polar reshygion at 5 and 2 mb but at 04 mb the polar cyclone had become reestablished During the next week the transition back to a relatively undisturbed westerly circulation could -be noted at 2 mb and by January 24 this became the pattern at the 5-mb level

During February the polar cyclone intensified at all levels but did not attain the depth reached before the warming The cold air at 5 and 2 mb was someshywhat displaced from the Pole toward northern Canada

- whereas at 04 mb warm air extending from northern Siberia dominated the polar area Although perturbashytions in the temperature fields at high latitudes were noted throughout February and March no significant departures from the basic westerly circulation of the polar vortex were observed The final springtime change from winter to sumshymer conditions could be seen at the end of March at 5 and 2 mrb A warm area was first seen north of Alaska and moved over the polar region In associashytion with the warm area anticyclonic circulation developed in mid-April over the Kamchatka-Alaska

4

region The anticyclonic circulation was displaced northward and an easterly circulation dominated the polar region by the end of April The cyclonic circulation with its associated cold westerlies was displaced southward during May as the polar anti-cyclone intensified and expanded By the end of May the middle and upper stratosphere over the entire Northern Hemisphere was under the influence of sum-mer easterly circulation with the warm air centered at the Pole

The summertime polar anticyclone warmed further during June and gradually intensified Peak tempera-ture and height at the Pole were reached toward the beginning of July with maximum wind reported near subtropical latitudes Thereafter the anticyclone de-cayed slowly as the duration of sunshine decreased in Arctic latitudes Cyclonic circulation formed in the polar area at the end of August and spread as the high latitudes cooled The easterly circulation was displaced southward in the form of cellular ridges reaching low latitudes at the end of September and merging into the subtropical circulation Thus by October westerly circulation predominated over mid-dIe and high latitudes of the Northern Hemisphere stratosphere in low latitudes a variable easterly circulation was associated with fluctuations of the position of the subtropical ridge

During October November and December the polar cyclone deepened accompanied by increasing westerly winds over most of the area However several eastward pulsations of the Aleutian anticy-clone resulted in disturbances of the westerly flow over Alaska and northwestern Canada The anti-cyclone first appeared on November 6 as a weak disturbance at 5 mb over the eastern Pacific By November 20 the anticyclone was found over Alaska at all analysis levels Rapid intensification as well as an eastward movement occurred during the next week affecting the circulation as far east as Fort Churchill Canada After the initial pulse the anti-cyclone retrograded but it persisted although less intense during the rest of December High tempera-

tures were seen during thisperiod in a warm ridge stretching from the Caribbean to southern Europe and across Asia to eastern Siberia This subtropical system sloped northward with height in hydrostatic response to the warm air at higher levels By Decemshyher 18 the warm air at 2 mb over southern Europe exhibited measured temperatures higher than OC At the same time the axis of cold air elongated and split with one center visible ov6r central Canada At the 04-mb level the data indicated a cbnsidershyably disturbed temperature field during the last week of the year with warm air-apparent over the polar region and cold air displaced southward

The principal features of the circulation during 1968 at five representative rocket launch sites may be seen in the time sections (figs 1-5) of analyzed height and temperature values extracted from the weekly charts The annual trend of the height and temperature values is most pronounced at the middleshyand higllatitude stations (figs 1-3) with the largest range of values occurring in the more northerly statiois (Johnson and Gelman 1968) Superimposed on this annual trend characterized by maximum values in summer and minimum values in winter are various perturbations The largest of these perturbashytions was in January and was associated with the major stratospheric warming mentioned above Smaller scale disturbances associated with movements of the Aleutian anticyclone were seen in November and December At the tropical station of Antigua West Indies Associated State (WIAS) the range of values is very small with only very minor perturbashytions affecting the station (fig 5) There is a sugshygestion however of a double maximum at the time of the equinoxes associated with the semiannual variashytion in temperature and wind and related to the seasonal migration of the subtropical anticyclone as seen in the charts At the subtropical station of White Sands N Me (fig 4) a combination of the major annual variation and the semiannual variation is apparent (This discussion prepared by Melvyn E Gelman)

5

ACKNOWLEDGMENTS

Funds for the analysis of the 1968 chart series were provided by the National Aeronautics and Space Administration under contract P 44664 (G)

Personnel actively engaged in the analysis projectwere Project Manager F G Finger Project Analyst

M E Gelman Research Consultant A 1 Miller Data Processing D L Griffith and J A Booth and Computer Operations K W Johnson

Ballard H N A Review of Seven Papers Concern-ing the Measurement of Temperature in the Stratosphere and Mesosphere ECOM 5125 US Army Electronics Command Fort Mon-mouth NJ May 1967 67 pp

Barr W Correctionsof RadiationalError of Radio-sonde Temperature Measurements in the Stratos-pher US Army Electronics Command Fort Monmouth NJ 1966 (personal communication)

Drews W A A Thermistor Arrangement to Im-prove Temperature Measurement at High Alti-tude NASA Contract Report 533 Aug 1966 29 pp

Environmental Science Services Administration Weather Bureau Constant Pressure Charts MF-494 National Weather Records Center Ashe-ville NC 1968

Finger F G Woolf H M and Anderson C E A Method for Objective Analysis of Stratos-pheric Constant-Pressure Charts Monthly Weather Review Vol 93 No 10 Oct 1965 pp 619-638

Finger F_ G Woolf H M and Anderson C E Synoptic Analyses of the 5- 2- and 04-Milli-bar Surfaces for the IQSY Period Monthly Weather Review Vol 94 No 11 Nov 1966 pp 651-661

Johnson K W A Preliminary Study of the Strato-spheric Warming of December 1967- January 1968 Monthly Weather Review Vol 97 No 8 Aug 1969 pp 553-564

Johnson K W and Gelman M E Temperature and Height Variability in the Middle and Upper Stratosphere During 1964-1966 as Determined From Constant Pressure Charts Monthly Weather Review Vol 96 No 6 June 1968 pp 371-382

Mclnturff R M and Finger F G The Compati-bility of Radiosonde Data at Stratospheric Levels

6

Over the Northern Hemisphere ESSA Techshynical Memorandum WBTM DATAC 2 Silver Spring Md Dec 1968 61 pp

Miers B T and Beyers N J Rocketsonde Wind and Temperature Measurements Between 30 and 70 Km for Selected Stations Journalof Applied Meteorolgy Vol 3 No 1 Feb 1964 pp 16-26

Miller A J A Note on the Variability of Ternshyperature as Indicated by Rocletsonde Thermisshytors Journal of Applied Meteorology Vol 8

No 1 Feb 1969 pp 172-174

Miller A J and Schmidlin F J Rocketsonde Repeatability and Stratospheric Variability Journal of Applied Meteorology Vol 10 No 2 April 1971 pp 320-327

Muench H S Temperature Measurements in the 30- to 40-Kilometer Region Monthly Weather Review Vol 99 No 2 Feb 1971 pp 158-160

Reed R J McKenzie D J and Vyverberg J C Diurnal Tidal Motions Between 30 and 60 Kilometers in Summer Journal of the Atmxrsshypheric Sciences Vol 23 No 4 July 1966 pp 416-423

Staff Upper Air Branch National Meteorological Center Weekly Synoptic Analyses 5- 2- and 04-Mb Surfaces for 1964 (Based on Observations of the Meteorological Rocket Network During the IQSY ESSA Technical Report WB 2 Silver Spring Md Apr 1967a 176 pp

Staff Upper Air Branch National Meteorological Center Weekly Synoptic Analyses 5- 2- and 04-Mb Surfaces for 1965 (Based on Observa tions of the Meteorological Rocket Network During the IQSY ESSA Technical Report WB 3 Silver Spring Md Aug 1967b 173 pp

Staff Upper Air Branch National Meteorological Center Weekly Synoptic Analyses 5- 2- and 04-Mb Surfaces for 1966 [Based on Mete orological Rocketsonde and High-Level Rawinshysonde Observations] ESSA Technical Report WB 9 Silver Spring Md Jan 1969 169 pp

Staff Upper Air Branch National Meteorological Center Weekly Synoptic Analyses 5- 2- and 04-Millibar Surfaces for 1967 (Based on Meteshyorological Rocketsonde and High-Level Rawinshysonde Observations) ESSA Technical Report WB 12 Silver Spring Md Jan 1970 169 pp

World Data Center A Meteorology Data Report Meteorological Rocket Network Firings 1968 Vol V National Weather Records Center Asheshyville NC 1969

58

57 H --TEMP X-x

56

55

54

53

52 x-1

51 X X-Xx 04M8BX 3

-5045 shy

44shy

43_ bull 42 xlXX-~ -x X--~ -xxlt--- x- ~~X-X

41 --X- _xXx -

-40 X 2M8 -JAN1396MO shy

54Wa JcV~Ax- - - - - - - - -X X X - - 50 II 37-13

36 - ~x-X-X-X-X_x_xxxx -0

534 X I -X-

3 17 31 14 28 13 27 07 94 8 22 5 19 3 T 31 14 28 11 25 9 23 6 20 4 18 7

JAN 1968 FEB MAR APR 10AY MN JUL AUG SEPT OCT NOV DEC 1968

FIGURE 1-Fort Greely Alaska (64000N 145044W) analyzed values extracted from weekly 5- 2- and 04-mb charts

TEMP x57

56

55

- _S3~~ X--ex- X-x-xxX-x-x-x- -0--^ X-x-xx-x-X x k X- X-XXx

52X N51 842MB 2x48 O -3-50

E M

Fia yda

54M

536X

37I -o

i-X-x X17-- xxX x lx 6 YX X xx X Xx -l -5040 --- 244B ILI Ix 1-Z

13 7 P I D 7

36 041 -307311327IpR X 8I

FEB MAR MAY 1I AVG SEPT OCT NOV DEC 1968

35 17 1142 8MAV 19 2

JAN 1968 _APR_ N

FIGURE 2--ort Churchill Canada (W4deg4N 9349W) analyzed values extracted fromn weekly 5- 2-and 04-rob charts

TEMP x-x

57

54 0

X-X~ 1 X-XXX---- -Xe X X--X -x----NX -20 04MB

c44

-43 -1311P

47 x-x tx A e Xx x -20

5MB

36-1035 -0 -fX--Xx-x-X--X- - Xx-x-X-X-X XXx x shyx- X -x- xx IIIIx- ~x yy X- 30 x-X - Xx x-X-X -x -X x-x-U

IxIIF 1 1T1 1 1 1l I 1 1 l I 1 1 1 1 1 1 I Io X I 1 1 1 1 1 1 I I-fU I 3 1731 4 28 1327 0 24 8 22 19 3 17 31 4 28 125 9 23 6 20 4 8 - dAN 1968 FEB MAR APR MAY JUN JUL AUG SEPT OCT NOV DEC 1968

I FIGURE 3-Walops Island Va (370 50N75 029W) analyzed values extracted from weekly 5 2- and 04-mb charts

effects of solar heating on the rod thermitor were 2- and 04-mb surfaces was as follows determined with the aid of a computer program that calculated monthly mean differences between reported daylight and darkness values Input to this program consisted of all available 5-mb data for 1964 and 1967 from stations in North America and adjacent ocean areas that employ US outrigger-type radiosonde in-struments (for details of the adjustment and further references see Mclnturff and Finger 1968)

Theoretical and laboratory studies of the rod thermistor used in present-day radiosondes indicated that a significant error may be induced by infrared cooling at stratospheric levels above about 10 mb Therefore a second adjustment (Barr 1966) was added to all reported 5-mb data including observa-tions made actually in darkness and daytime data that had been adjusted for solar-radiation error The magnitude of the temperature correction is a function of reported temperature while the height adjustment varies linearly with the temperature correction

Rawinsonde data utilized for the 5-mb charts were processed by computer methods Inputs to the com-puter program consisted of observations from North America and adjacent oceanareas for 7- 5- 4- and 3-mb levels in the form of punched cards obtained from the National Weather Records Center Output listings included all observations for 1 week at each station Data for levels other than 5 mb were also listed to supply the analyst with as much suppleshymentary information as possible Thermal winds and

corresponding horizontal temperature gradients were computed for the layers from 7 to 5 7 to 4 and 5 to 4 nib

After processing the rawinsonde-derived tempera-ture height wind and thermal wind were plotted on work charts For charts presented in this publication the rawinsonde data have been omitted for the sake of legibility

PROCESSING OF ROCKETSONDE DATA

Winds and termperatures measured by rocketsonde systems comprised the basic data sample for analyses at the 2- and 04-mb levels and were also used in combination with rawinsonde data for the 5-mb charts Rocketsonde information was obtained for this proj-ect in the form of magnetic tape identical in format to published information contained in the Meteorolog-ical Rocket Network (MRN) Firings (World Data Center A 1969)

The procedure for extraction of rocketsonde in-formation and for computation of heights of the 5

a Wind and temperature profiles were processed by a computer program designed to reduce the amplitude of rapid oscillations in the vertical by using a simple (1-2-1) smoothing technique This processing was done because analyses are intended to portray only the broad-scale stratoshyspheric features

b Temperatures were modified above 40 km in accordance with Drews (1966) publication one of several theoretical studies (see the review article by Ballard 1967) For the Areasonde IA the instrument most widely employed during 1968 the correction applied to the temperature profiles increased from PdegC at 42 km to about 9degC at 58 km

cAn initial estimate of the geopotential height for each station at the respective pressure levels (5 2 and 04 mb) had to be made before the temperature for that particular level could be

selected This estimate was obtained by deriving the temporal trend of the geopotential height for the station from the lower level analyzed charts and by applying this trend to the geopotential height for the station as shown by the previously analyzed chart The temperature at this estishymated height was then extracted from the ternshyperature profile

d The true geopotential height of the pressure surface at each station was then hydrostatically computed for each available temperature profile This height was obtained by deriving a layershymean temperature between the extracted tershyperature of the upper level and the temperature obtained from the previously completed lower

level analysis Computer-analyzed 10-ob charts (Environmental Science Services Administration 1968) based exclusively on rawinsonde data were used as foundation for hydrostatic compushytation of the height of the 5-mb surface For the 5- and 2-mb levels a constant lapse rate was considered representative However because a temperature maximum (associated with the stratashypause) usually exists between 2 and 04 nib mean temperatures were derived by usifig values exshytracted at each whole kilometer between these two pressure levels

e Wind components were extracted from the smoothed profiles at the height of the constantshypressure surface and a resultant wind was cornshyputed

2

f Thermal winds were determined for 6-kn layers surrounding each pressure surface at the report-ing station

The rooketsonde data (temperature height wind direction and speed and thermal wind) were plotted on work charts On the charts presented for publica-tion three observations are shown when available for each station Heights and thermal winds have been omitted for the sake of legibility The Station Model and Reporting Rocket Stations chart illustrates the symbols used to distinguish the data obtained on Wednesdays from off-time data

ANALYSIS PROCEDURE

Conventional techniques including differential a tnalysistechs construct t -2-m wdnierenused ilanalysis methods were used to construct the 5- 2-

and 04-mb charts H~owever because of the sparsity

of observations data acquired for the entire week were

examined to dtriethe synoptic changes that took petaingplace during the week Thus conditions pertaining

to Wednesday the analysis day were deduced The analysis system consisted of the following

steps

a Isotherms were derived using both processed rocketsonde and rawinsonde temperatures where available In spite of the corrections applied to the 5-mb rawinsonde temperature data large differences could sometimes be seen when corn-paring rocketsonde data that were close in time and distance (Muench 1971) Generally the problem could be resolved by giving greater weight to rawinsonde stations employing hyp-someters In a few cases the difficulty even oc-curred with hypsometer radiosondes therefore some compromise value had to be chosen usu-ally closer to the rocketsonde-reported temper-ature Computed thermal winds were especially useful in determining horizontal temperature gradients and the relative location of warm and cold areas Where possible time-height sections of temperature were plotted as a further aid in deriving the isotherms

bA mean temperature field representative of the layer between the previously analyzed lower sur-face and the selected surface was derived graph-ically This mean field represents a geopotential thi6kness which when added to the lower level height field yields a smooth conservative first approximation to the contour pattern at th6 upper surface

c Reported winds and computed heights for indishyvidual stations were then used to adjust the first approximation of the contour field using the assumption of geostrophic flow Winds were acshycorded the highest priority for this adjustment When large adjustments were made to the conshytour field the temperature field was then adshyjusted to maintain hydrostatic consistency

d The analysis was reviewed for vertical and temshyporal consistency For example circulation censhyters ridges and troughs were examined with the aid of all available data to verify vertical slope and movement with time Time-height secshytions and height-change charts were especially useful for these purposes

The above procedures appear to produce excellent results at 5 mb and were successfully applied to ohshytain the 2- and 04-mb charts Generally only slightadjustments of the first-approximation height fields

were necessa at the 5- and 2-mb levels However

wrtierncsaya h -ad -blvlHwvr rather formidable analysis problems were evident atthe 04-mb level One problem arises from the apparshyent intersection of the stratopause with the 04-mb level Because the normal stratospheric temperature inversion ceases at the stratopause level the graphical method for obtaining mean temperature which deshypends on the existence of a linear profile is no longer valid Large adjustments must be made especially at lower latitudes in the graphically derived height field to conform with the computed height-at each station (as discussed in the previous section)

Another difficulty was the apparent occurrence of large day-to-day temperature changes at times exceedshying 10C (Miller 1969) and persistent oscillations in many wind profiles In most cases deviations of reported temperatures and winds from one another could be accounted for by identifiable rapid largeshyscale synoptic changes Sometimes reports within a few hours of each other at a single station exhibited temperature changes of 5 to 70 C over a limited height interval near the stratopause It has been shown that such small-scale subsynoptie changes are possible at these levels (Miller and Schmidlin 1971) Thus some intermediate value was chosen for analyshy

sis to represent the value on the analysis day Ocshycasionally it was impossible to make a reasonable reconciliation of reported station values

An additional problem is encountered in the sumshymer charts During that season circulation at the upper surfaces (2 and 0 mb) would be expected to follow the pattern established for lower levels that is a rather uniform easterly flow about an anticyclone

3

centered at or very near the North Pole However on- a typical summertime 04-mb chart most reported rocketsonde winds exhibit significant southerly corn-ponents If these winds- were to be given full weight in the analysis the resulting pattern would consist of contours oriented from- southeast to northwest spiraling toward a high center located apparently over northern Europe

The prevalence of positive meridional components in summertime rocketsonde winds has been noted previously (Miers and Beyers 1964) Studies (Reed et al 1966) based on MRN data for several summers have demonstrated that the meridional wind corn-ponent resulting from the diurnal tide reaches maxi-mum southerly strength at about noon local time Because most MRN firings occur near local noon

the measured winds naturally contain this component Although no adjustments were made in individual reports the analysis procedure includes suitable compensation Differences in the reported winds and orientation of the contours may be quite pronounced especially on the summertime charts Strong westerly winds of winter usually mask the weak diurnal com-ponent but there is a possibility that this component may contribute to some bias in analysis during periods of weak circulation

Although careful consideration of high-level data allows a broad-scale depiction of circulation patterns up to 04 rb the -sparsity of reports requires an increasing amount of subjectivity as the analysis pro-ceeds to this high level As yet the analyst has little in the way of synoptic models for guidance with respect to the probable contour and isotherm patterns and the phase relation between these patterns in areas of sparse data The geographical area of analy-sis for the charts has thus been reduced in accordance with the available data The justification for some analyses depends on the interpretation of the limited am6unt of data in such a way as to portray a co-herent sequence of synoptic events In spite of these factors surprisingly little alteration in the principal features of the circulation and temperature distribu-tion shown in the final analysis can be made without inordinately violating spine of the data In general the contours and isotherms -depicted are felt to be good approximations to the flow and temperature patterns at these levels Even so the same degree of accuracy that is found customarily in the analysis of charts at lower levels should not be expected

A contour interval of 320-geopotential meters (gpm) was used throughout- the year In addition

intermediate dashed contours were -used to outline

areas of relatively weak gradient especially during the spring and fall changeover periods Isotherms were drawn and labeled at 5C intervals

DISCUSSION OF THE 1968 CHARTS

The temperature and circulation anomalies assoshyciated with the major stratospheric warming that began in December 1967 (Johnson 1969 Staff 1970) persisted into the beginning of 1968 Maximum temperatures bad been observed at the end of Deshycember with a reversal of the normal wintertime temperature gradient between the North Pole and middle latitudes occurring first at the highest levels then proceeding downward to lower levels Thus at 5 mb on January 3 a wave-two pattern in the isoshytherms and contours was clearly seen with the warm air stretching over the Pole associated with -the two cyclones and with the cold air in the Bering Sea and the Atlantic Ocean associated with the two antishycyclones At 2 nib cold air had returned to the polar area with a warm aiea apparent over western Canada Hydrostatically consistent with this situation was a weakening of the circulation at 2 mb and a disapshypearance of the North Atlantic anticyclone at the 04-mb level with a strong anticyclone apparent in the eastern Pacific The major effects of the stratoshyspheric warming had thus diminished at the upper levels but were propagating downward with time and were still evident at lower altitudes By January 10 anticyclonic circulation dominated the polar reshygion at 5 and 2 mb but at 04 mb the polar cyclone had become reestablished During the next week the transition back to a relatively undisturbed westerly circulation could -be noted at 2 mb and by January 24 this became the pattern at the 5-mb level

During February the polar cyclone intensified at all levels but did not attain the depth reached before the warming The cold air at 5 and 2 mb was someshywhat displaced from the Pole toward northern Canada

- whereas at 04 mb warm air extending from northern Siberia dominated the polar area Although perturbashytions in the temperature fields at high latitudes were noted throughout February and March no significant departures from the basic westerly circulation of the polar vortex were observed The final springtime change from winter to sumshymer conditions could be seen at the end of March at 5 and 2 mrb A warm area was first seen north of Alaska and moved over the polar region In associashytion with the warm area anticyclonic circulation developed in mid-April over the Kamchatka-Alaska

4

region The anticyclonic circulation was displaced northward and an easterly circulation dominated the polar region by the end of April The cyclonic circulation with its associated cold westerlies was displaced southward during May as the polar anti-cyclone intensified and expanded By the end of May the middle and upper stratosphere over the entire Northern Hemisphere was under the influence of sum-mer easterly circulation with the warm air centered at the Pole

The summertime polar anticyclone warmed further during June and gradually intensified Peak tempera-ture and height at the Pole were reached toward the beginning of July with maximum wind reported near subtropical latitudes Thereafter the anticyclone de-cayed slowly as the duration of sunshine decreased in Arctic latitudes Cyclonic circulation formed in the polar area at the end of August and spread as the high latitudes cooled The easterly circulation was displaced southward in the form of cellular ridges reaching low latitudes at the end of September and merging into the subtropical circulation Thus by October westerly circulation predominated over mid-dIe and high latitudes of the Northern Hemisphere stratosphere in low latitudes a variable easterly circulation was associated with fluctuations of the position of the subtropical ridge

During October November and December the polar cyclone deepened accompanied by increasing westerly winds over most of the area However several eastward pulsations of the Aleutian anticy-clone resulted in disturbances of the westerly flow over Alaska and northwestern Canada The anti-cyclone first appeared on November 6 as a weak disturbance at 5 mb over the eastern Pacific By November 20 the anticyclone was found over Alaska at all analysis levels Rapid intensification as well as an eastward movement occurred during the next week affecting the circulation as far east as Fort Churchill Canada After the initial pulse the anti-cyclone retrograded but it persisted although less intense during the rest of December High tempera-

tures were seen during thisperiod in a warm ridge stretching from the Caribbean to southern Europe and across Asia to eastern Siberia This subtropical system sloped northward with height in hydrostatic response to the warm air at higher levels By Decemshyher 18 the warm air at 2 mb over southern Europe exhibited measured temperatures higher than OC At the same time the axis of cold air elongated and split with one center visible ov6r central Canada At the 04-mb level the data indicated a cbnsidershyably disturbed temperature field during the last week of the year with warm air-apparent over the polar region and cold air displaced southward

The principal features of the circulation during 1968 at five representative rocket launch sites may be seen in the time sections (figs 1-5) of analyzed height and temperature values extracted from the weekly charts The annual trend of the height and temperature values is most pronounced at the middleshyand higllatitude stations (figs 1-3) with the largest range of values occurring in the more northerly statiois (Johnson and Gelman 1968) Superimposed on this annual trend characterized by maximum values in summer and minimum values in winter are various perturbations The largest of these perturbashytions was in January and was associated with the major stratospheric warming mentioned above Smaller scale disturbances associated with movements of the Aleutian anticyclone were seen in November and December At the tropical station of Antigua West Indies Associated State (WIAS) the range of values is very small with only very minor perturbashytions affecting the station (fig 5) There is a sugshygestion however of a double maximum at the time of the equinoxes associated with the semiannual variashytion in temperature and wind and related to the seasonal migration of the subtropical anticyclone as seen in the charts At the subtropical station of White Sands N Me (fig 4) a combination of the major annual variation and the semiannual variation is apparent (This discussion prepared by Melvyn E Gelman)

5

ACKNOWLEDGMENTS

Funds for the analysis of the 1968 chart series were provided by the National Aeronautics and Space Administration under contract P 44664 (G)

Personnel actively engaged in the analysis projectwere Project Manager F G Finger Project Analyst

M E Gelman Research Consultant A 1 Miller Data Processing D L Griffith and J A Booth and Computer Operations K W Johnson

Ballard H N A Review of Seven Papers Concern-ing the Measurement of Temperature in the Stratosphere and Mesosphere ECOM 5125 US Army Electronics Command Fort Mon-mouth NJ May 1967 67 pp

Barr W Correctionsof RadiationalError of Radio-sonde Temperature Measurements in the Stratos-pher US Army Electronics Command Fort Monmouth NJ 1966 (personal communication)

Drews W A A Thermistor Arrangement to Im-prove Temperature Measurement at High Alti-tude NASA Contract Report 533 Aug 1966 29 pp

Environmental Science Services Administration Weather Bureau Constant Pressure Charts MF-494 National Weather Records Center Ashe-ville NC 1968

Finger F G Woolf H M and Anderson C E A Method for Objective Analysis of Stratos-pheric Constant-Pressure Charts Monthly Weather Review Vol 93 No 10 Oct 1965 pp 619-638

Finger F_ G Woolf H M and Anderson C E Synoptic Analyses of the 5- 2- and 04-Milli-bar Surfaces for the IQSY Period Monthly Weather Review Vol 94 No 11 Nov 1966 pp 651-661

Johnson K W A Preliminary Study of the Strato-spheric Warming of December 1967- January 1968 Monthly Weather Review Vol 97 No 8 Aug 1969 pp 553-564

Johnson K W and Gelman M E Temperature and Height Variability in the Middle and Upper Stratosphere During 1964-1966 as Determined From Constant Pressure Charts Monthly Weather Review Vol 96 No 6 June 1968 pp 371-382

Mclnturff R M and Finger F G The Compati-bility of Radiosonde Data at Stratospheric Levels

6

Over the Northern Hemisphere ESSA Techshynical Memorandum WBTM DATAC 2 Silver Spring Md Dec 1968 61 pp

Miers B T and Beyers N J Rocketsonde Wind and Temperature Measurements Between 30 and 70 Km for Selected Stations Journalof Applied Meteorolgy Vol 3 No 1 Feb 1964 pp 16-26

Miller A J A Note on the Variability of Ternshyperature as Indicated by Rocletsonde Thermisshytors Journal of Applied Meteorology Vol 8

No 1 Feb 1969 pp 172-174

Miller A J and Schmidlin F J Rocketsonde Repeatability and Stratospheric Variability Journal of Applied Meteorology Vol 10 No 2 April 1971 pp 320-327

Muench H S Temperature Measurements in the 30- to 40-Kilometer Region Monthly Weather Review Vol 99 No 2 Feb 1971 pp 158-160

Reed R J McKenzie D J and Vyverberg J C Diurnal Tidal Motions Between 30 and 60 Kilometers in Summer Journal of the Atmxrsshypheric Sciences Vol 23 No 4 July 1966 pp 416-423

Staff Upper Air Branch National Meteorological Center Weekly Synoptic Analyses 5- 2- and 04-Mb Surfaces for 1964 (Based on Observations of the Meteorological Rocket Network During the IQSY ESSA Technical Report WB 2 Silver Spring Md Apr 1967a 176 pp

Staff Upper Air Branch National Meteorological Center Weekly Synoptic Analyses 5- 2- and 04-Mb Surfaces for 1965 (Based on Observa tions of the Meteorological Rocket Network During the IQSY ESSA Technical Report WB 3 Silver Spring Md Aug 1967b 173 pp

Staff Upper Air Branch National Meteorological Center Weekly Synoptic Analyses 5- 2- and 04-Mb Surfaces for 1966 [Based on Mete orological Rocketsonde and High-Level Rawinshysonde Observations] ESSA Technical Report WB 9 Silver Spring Md Jan 1969 169 pp

Staff Upper Air Branch National Meteorological Center Weekly Synoptic Analyses 5- 2- and 04-Millibar Surfaces for 1967 (Based on Meteshyorological Rocketsonde and High-Level Rawinshysonde Observations) ESSA Technical Report WB 12 Silver Spring Md Jan 1970 169 pp

World Data Center A Meteorology Data Report Meteorological Rocket Network Firings 1968 Vol V National Weather Records Center Asheshyville NC 1969

58

57 H --TEMP X-x

56

55

54

53

52 x-1

51 X X-Xx 04M8BX 3

-5045 shy

44shy

43_ bull 42 xlXX-~ -x X--~ -xxlt--- x- ~~X-X

41 --X- _xXx -

-40 X 2M8 -JAN1396MO shy

54Wa JcV~Ax- - - - - - - - -X X X - - 50 II 37-13

36 - ~x-X-X-X-X_x_xxxx -0

534 X I -X-

3 17 31 14 28 13 27 07 94 8 22 5 19 3 T 31 14 28 11 25 9 23 6 20 4 18 7

JAN 1968 FEB MAR APR 10AY MN JUL AUG SEPT OCT NOV DEC 1968

FIGURE 1-Fort Greely Alaska (64000N 145044W) analyzed values extracted from weekly 5- 2- and 04-mb charts

TEMP x57

56

55

- _S3~~ X--ex- X-x-xxX-x-x-x- -0--^ X-x-xx-x-X x k X- X-XXx

52X N51 842MB 2x48 O -3-50

E M

Fia yda

54M

536X

37I -o

i-X-x X17-- xxX x lx 6 YX X xx X Xx -l -5040 --- 244B ILI Ix 1-Z

13 7 P I D 7

36 041 -307311327IpR X 8I

FEB MAR MAY 1I AVG SEPT OCT NOV DEC 1968

35 17 1142 8MAV 19 2

JAN 1968 _APR_ N

FIGURE 2--ort Churchill Canada (W4deg4N 9349W) analyzed values extracted fromn weekly 5- 2-and 04-rob charts

TEMP x-x

57

54 0

X-X~ 1 X-XXX---- -Xe X X--X -x----NX -20 04MB

c44

-43 -1311P

47 x-x tx A e Xx x -20

5MB

36-1035 -0 -fX--Xx-x-X--X- - Xx-x-X-X-X XXx x shyx- X -x- xx IIIIx- ~x yy X- 30 x-X - Xx x-X-X -x -X x-x-U

IxIIF 1 1T1 1 1 1l I 1 1 l I 1 1 1 1 1 1 I Io X I 1 1 1 1 1 1 I I-fU I 3 1731 4 28 1327 0 24 8 22 19 3 17 31 4 28 125 9 23 6 20 4 8 - dAN 1968 FEB MAR APR MAY JUN JUL AUG SEPT OCT NOV DEC 1968

I FIGURE 3-Walops Island Va (370 50N75 029W) analyzed values extracted from weekly 5 2- and 04-mb charts

f Thermal winds were determined for 6-kn layers surrounding each pressure surface at the report-ing station

The rooketsonde data (temperature height wind direction and speed and thermal wind) were plotted on work charts On the charts presented for publica-tion three observations are shown when available for each station Heights and thermal winds have been omitted for the sake of legibility The Station Model and Reporting Rocket Stations chart illustrates the symbols used to distinguish the data obtained on Wednesdays from off-time data

ANALYSIS PROCEDURE

Conventional techniques including differential a tnalysistechs construct t -2-m wdnierenused ilanalysis methods were used to construct the 5- 2-

and 04-mb charts H~owever because of the sparsity

of observations data acquired for the entire week were

examined to dtriethe synoptic changes that took petaingplace during the week Thus conditions pertaining

to Wednesday the analysis day were deduced The analysis system consisted of the following

steps

a Isotherms were derived using both processed rocketsonde and rawinsonde temperatures where available In spite of the corrections applied to the 5-mb rawinsonde temperature data large differences could sometimes be seen when corn-paring rocketsonde data that were close in time and distance (Muench 1971) Generally the problem could be resolved by giving greater weight to rawinsonde stations employing hyp-someters In a few cases the difficulty even oc-curred with hypsometer radiosondes therefore some compromise value had to be chosen usu-ally closer to the rocketsonde-reported temper-ature Computed thermal winds were especially useful in determining horizontal temperature gradients and the relative location of warm and cold areas Where possible time-height sections of temperature were plotted as a further aid in deriving the isotherms

bA mean temperature field representative of the layer between the previously analyzed lower sur-face and the selected surface was derived graph-ically This mean field represents a geopotential thi6kness which when added to the lower level height field yields a smooth conservative first approximation to the contour pattern at th6 upper surface

c Reported winds and computed heights for indishyvidual stations were then used to adjust the first approximation of the contour field using the assumption of geostrophic flow Winds were acshycorded the highest priority for this adjustment When large adjustments were made to the conshytour field the temperature field was then adshyjusted to maintain hydrostatic consistency

d The analysis was reviewed for vertical and temshyporal consistency For example circulation censhyters ridges and troughs were examined with the aid of all available data to verify vertical slope and movement with time Time-height secshytions and height-change charts were especially useful for these purposes

The above procedures appear to produce excellent results at 5 mb and were successfully applied to ohshytain the 2- and 04-mb charts Generally only slightadjustments of the first-approximation height fields

were necessa at the 5- and 2-mb levels However

wrtierncsaya h -ad -blvlHwvr rather formidable analysis problems were evident atthe 04-mb level One problem arises from the apparshyent intersection of the stratopause with the 04-mb level Because the normal stratospheric temperature inversion ceases at the stratopause level the graphical method for obtaining mean temperature which deshypends on the existence of a linear profile is no longer valid Large adjustments must be made especially at lower latitudes in the graphically derived height field to conform with the computed height-at each station (as discussed in the previous section)

Another difficulty was the apparent occurrence of large day-to-day temperature changes at times exceedshying 10C (Miller 1969) and persistent oscillations in many wind profiles In most cases deviations of reported temperatures and winds from one another could be accounted for by identifiable rapid largeshyscale synoptic changes Sometimes reports within a few hours of each other at a single station exhibited temperature changes of 5 to 70 C over a limited height interval near the stratopause It has been shown that such small-scale subsynoptie changes are possible at these levels (Miller and Schmidlin 1971) Thus some intermediate value was chosen for analyshy

sis to represent the value on the analysis day Ocshycasionally it was impossible to make a reasonable reconciliation of reported station values

An additional problem is encountered in the sumshymer charts During that season circulation at the upper surfaces (2 and 0 mb) would be expected to follow the pattern established for lower levels that is a rather uniform easterly flow about an anticyclone

3

centered at or very near the North Pole However on- a typical summertime 04-mb chart most reported rocketsonde winds exhibit significant southerly corn-ponents If these winds- were to be given full weight in the analysis the resulting pattern would consist of contours oriented from- southeast to northwest spiraling toward a high center located apparently over northern Europe

The prevalence of positive meridional components in summertime rocketsonde winds has been noted previously (Miers and Beyers 1964) Studies (Reed et al 1966) based on MRN data for several summers have demonstrated that the meridional wind corn-ponent resulting from the diurnal tide reaches maxi-mum southerly strength at about noon local time Because most MRN firings occur near local noon

the measured winds naturally contain this component Although no adjustments were made in individual reports the analysis procedure includes suitable compensation Differences in the reported winds and orientation of the contours may be quite pronounced especially on the summertime charts Strong westerly winds of winter usually mask the weak diurnal com-ponent but there is a possibility that this component may contribute to some bias in analysis during periods of weak circulation

Although careful consideration of high-level data allows a broad-scale depiction of circulation patterns up to 04 rb the -sparsity of reports requires an increasing amount of subjectivity as the analysis pro-ceeds to this high level As yet the analyst has little in the way of synoptic models for guidance with respect to the probable contour and isotherm patterns and the phase relation between these patterns in areas of sparse data The geographical area of analy-sis for the charts has thus been reduced in accordance with the available data The justification for some analyses depends on the interpretation of the limited am6unt of data in such a way as to portray a co-herent sequence of synoptic events In spite of these factors surprisingly little alteration in the principal features of the circulation and temperature distribu-tion shown in the final analysis can be made without inordinately violating spine of the data In general the contours and isotherms -depicted are felt to be good approximations to the flow and temperature patterns at these levels Even so the same degree of accuracy that is found customarily in the analysis of charts at lower levels should not be expected

A contour interval of 320-geopotential meters (gpm) was used throughout- the year In addition

intermediate dashed contours were -used to outline

areas of relatively weak gradient especially during the spring and fall changeover periods Isotherms were drawn and labeled at 5C intervals

DISCUSSION OF THE 1968 CHARTS

The temperature and circulation anomalies assoshyciated with the major stratospheric warming that began in December 1967 (Johnson 1969 Staff 1970) persisted into the beginning of 1968 Maximum temperatures bad been observed at the end of Deshycember with a reversal of the normal wintertime temperature gradient between the North Pole and middle latitudes occurring first at the highest levels then proceeding downward to lower levels Thus at 5 mb on January 3 a wave-two pattern in the isoshytherms and contours was clearly seen with the warm air stretching over the Pole associated with -the two cyclones and with the cold air in the Bering Sea and the Atlantic Ocean associated with the two antishycyclones At 2 nib cold air had returned to the polar area with a warm aiea apparent over western Canada Hydrostatically consistent with this situation was a weakening of the circulation at 2 mb and a disapshypearance of the North Atlantic anticyclone at the 04-mb level with a strong anticyclone apparent in the eastern Pacific The major effects of the stratoshyspheric warming had thus diminished at the upper levels but were propagating downward with time and were still evident at lower altitudes By January 10 anticyclonic circulation dominated the polar reshygion at 5 and 2 mb but at 04 mb the polar cyclone had become reestablished During the next week the transition back to a relatively undisturbed westerly circulation could -be noted at 2 mb and by January 24 this became the pattern at the 5-mb level

During February the polar cyclone intensified at all levels but did not attain the depth reached before the warming The cold air at 5 and 2 mb was someshywhat displaced from the Pole toward northern Canada

- whereas at 04 mb warm air extending from northern Siberia dominated the polar area Although perturbashytions in the temperature fields at high latitudes were noted throughout February and March no significant departures from the basic westerly circulation of the polar vortex were observed The final springtime change from winter to sumshymer conditions could be seen at the end of March at 5 and 2 mrb A warm area was first seen north of Alaska and moved over the polar region In associashytion with the warm area anticyclonic circulation developed in mid-April over the Kamchatka-Alaska

4

region The anticyclonic circulation was displaced northward and an easterly circulation dominated the polar region by the end of April The cyclonic circulation with its associated cold westerlies was displaced southward during May as the polar anti-cyclone intensified and expanded By the end of May the middle and upper stratosphere over the entire Northern Hemisphere was under the influence of sum-mer easterly circulation with the warm air centered at the Pole

The summertime polar anticyclone warmed further during June and gradually intensified Peak tempera-ture and height at the Pole were reached toward the beginning of July with maximum wind reported near subtropical latitudes Thereafter the anticyclone de-cayed slowly as the duration of sunshine decreased in Arctic latitudes Cyclonic circulation formed in the polar area at the end of August and spread as the high latitudes cooled The easterly circulation was displaced southward in the form of cellular ridges reaching low latitudes at the end of September and merging into the subtropical circulation Thus by October westerly circulation predominated over mid-dIe and high latitudes of the Northern Hemisphere stratosphere in low latitudes a variable easterly circulation was associated with fluctuations of the position of the subtropical ridge

During October November and December the polar cyclone deepened accompanied by increasing westerly winds over most of the area However several eastward pulsations of the Aleutian anticy-clone resulted in disturbances of the westerly flow over Alaska and northwestern Canada The anti-cyclone first appeared on November 6 as a weak disturbance at 5 mb over the eastern Pacific By November 20 the anticyclone was found over Alaska at all analysis levels Rapid intensification as well as an eastward movement occurred during the next week affecting the circulation as far east as Fort Churchill Canada After the initial pulse the anti-cyclone retrograded but it persisted although less intense during the rest of December High tempera-

tures were seen during thisperiod in a warm ridge stretching from the Caribbean to southern Europe and across Asia to eastern Siberia This subtropical system sloped northward with height in hydrostatic response to the warm air at higher levels By Decemshyher 18 the warm air at 2 mb over southern Europe exhibited measured temperatures higher than OC At the same time the axis of cold air elongated and split with one center visible ov6r central Canada At the 04-mb level the data indicated a cbnsidershyably disturbed temperature field during the last week of the year with warm air-apparent over the polar region and cold air displaced southward

The principal features of the circulation during 1968 at five representative rocket launch sites may be seen in the time sections (figs 1-5) of analyzed height and temperature values extracted from the weekly charts The annual trend of the height and temperature values is most pronounced at the middleshyand higllatitude stations (figs 1-3) with the largest range of values occurring in the more northerly statiois (Johnson and Gelman 1968) Superimposed on this annual trend characterized by maximum values in summer and minimum values in winter are various perturbations The largest of these perturbashytions was in January and was associated with the major stratospheric warming mentioned above Smaller scale disturbances associated with movements of the Aleutian anticyclone were seen in November and December At the tropical station of Antigua West Indies Associated State (WIAS) the range of values is very small with only very minor perturbashytions affecting the station (fig 5) There is a sugshygestion however of a double maximum at the time of the equinoxes associated with the semiannual variashytion in temperature and wind and related to the seasonal migration of the subtropical anticyclone as seen in the charts At the subtropical station of White Sands N Me (fig 4) a combination of the major annual variation and the semiannual variation is apparent (This discussion prepared by Melvyn E Gelman)

5

ACKNOWLEDGMENTS

Funds for the analysis of the 1968 chart series were provided by the National Aeronautics and Space Administration under contract P 44664 (G)

Personnel actively engaged in the analysis projectwere Project Manager F G Finger Project Analyst

M E Gelman Research Consultant A 1 Miller Data Processing D L Griffith and J A Booth and Computer Operations K W Johnson

Ballard H N A Review of Seven Papers Concern-ing the Measurement of Temperature in the Stratosphere and Mesosphere ECOM 5125 US Army Electronics Command Fort Mon-mouth NJ May 1967 67 pp

Barr W Correctionsof RadiationalError of Radio-sonde Temperature Measurements in the Stratos-pher US Army Electronics Command Fort Monmouth NJ 1966 (personal communication)

Drews W A A Thermistor Arrangement to Im-prove Temperature Measurement at High Alti-tude NASA Contract Report 533 Aug 1966 29 pp

Environmental Science Services Administration Weather Bureau Constant Pressure Charts MF-494 National Weather Records Center Ashe-ville NC 1968

Finger F G Woolf H M and Anderson C E A Method for Objective Analysis of Stratos-pheric Constant-Pressure Charts Monthly Weather Review Vol 93 No 10 Oct 1965 pp 619-638

Finger F_ G Woolf H M and Anderson C E Synoptic Analyses of the 5- 2- and 04-Milli-bar Surfaces for the IQSY Period Monthly Weather Review Vol 94 No 11 Nov 1966 pp 651-661

Johnson K W A Preliminary Study of the Strato-spheric Warming of December 1967- January 1968 Monthly Weather Review Vol 97 No 8 Aug 1969 pp 553-564

Johnson K W and Gelman M E Temperature and Height Variability in the Middle and Upper Stratosphere During 1964-1966 as Determined From Constant Pressure Charts Monthly Weather Review Vol 96 No 6 June 1968 pp 371-382

Mclnturff R M and Finger F G The Compati-bility of Radiosonde Data at Stratospheric Levels

6

Over the Northern Hemisphere ESSA Techshynical Memorandum WBTM DATAC 2 Silver Spring Md Dec 1968 61 pp

Miers B T and Beyers N J Rocketsonde Wind and Temperature Measurements Between 30 and 70 Km for Selected Stations Journalof Applied Meteorolgy Vol 3 No 1 Feb 1964 pp 16-26

Miller A J A Note on the Variability of Ternshyperature as Indicated by Rocletsonde Thermisshytors Journal of Applied Meteorology Vol 8

No 1 Feb 1969 pp 172-174

Miller A J and Schmidlin F J Rocketsonde Repeatability and Stratospheric Variability Journal of Applied Meteorology Vol 10 No 2 April 1971 pp 320-327

Muench H S Temperature Measurements in the 30- to 40-Kilometer Region Monthly Weather Review Vol 99 No 2 Feb 1971 pp 158-160

Reed R J McKenzie D J and Vyverberg J C Diurnal Tidal Motions Between 30 and 60 Kilometers in Summer Journal of the Atmxrsshypheric Sciences Vol 23 No 4 July 1966 pp 416-423

Staff Upper Air Branch National Meteorological Center Weekly Synoptic Analyses 5- 2- and 04-Mb Surfaces for 1964 (Based on Observations of the Meteorological Rocket Network During the IQSY ESSA Technical Report WB 2 Silver Spring Md Apr 1967a 176 pp

Staff Upper Air Branch National Meteorological Center Weekly Synoptic Analyses 5- 2- and 04-Mb Surfaces for 1965 (Based on Observa tions of the Meteorological Rocket Network During the IQSY ESSA Technical Report WB 3 Silver Spring Md Aug 1967b 173 pp

Staff Upper Air Branch National Meteorological Center Weekly Synoptic Analyses 5- 2- and 04-Mb Surfaces for 1966 [Based on Mete orological Rocketsonde and High-Level Rawinshysonde Observations] ESSA Technical Report WB 9 Silver Spring Md Jan 1969 169 pp

Staff Upper Air Branch National Meteorological Center Weekly Synoptic Analyses 5- 2- and 04-Millibar Surfaces for 1967 (Based on Meteshyorological Rocketsonde and High-Level Rawinshysonde Observations) ESSA Technical Report WB 12 Silver Spring Md Jan 1970 169 pp

World Data Center A Meteorology Data Report Meteorological Rocket Network Firings 1968 Vol V National Weather Records Center Asheshyville NC 1969

58

57 H --TEMP X-x

56

55

54

53

52 x-1

51 X X-Xx 04M8BX 3

-5045 shy

44shy

43_ bull 42 xlXX-~ -x X--~ -xxlt--- x- ~~X-X

41 --X- _xXx -

-40 X 2M8 -JAN1396MO shy

54Wa JcV~Ax- - - - - - - - -X X X - - 50 II 37-13

36 - ~x-X-X-X-X_x_xxxx -0

534 X I -X-

3 17 31 14 28 13 27 07 94 8 22 5 19 3 T 31 14 28 11 25 9 23 6 20 4 18 7

JAN 1968 FEB MAR APR 10AY MN JUL AUG SEPT OCT NOV DEC 1968

FIGURE 1-Fort Greely Alaska (64000N 145044W) analyzed values extracted from weekly 5- 2- and 04-mb charts

TEMP x57

56

55

- _S3~~ X--ex- X-x-xxX-x-x-x- -0--^ X-x-xx-x-X x k X- X-XXx

52X N51 842MB 2x48 O -3-50

E M

Fia yda

54M

536X

37I -o

i-X-x X17-- xxX x lx 6 YX X xx X Xx -l -5040 --- 244B ILI Ix 1-Z

13 7 P I D 7

36 041 -307311327IpR X 8I

FEB MAR MAY 1I AVG SEPT OCT NOV DEC 1968

35 17 1142 8MAV 19 2

JAN 1968 _APR_ N

FIGURE 2--ort Churchill Canada (W4deg4N 9349W) analyzed values extracted fromn weekly 5- 2-and 04-rob charts

TEMP x-x

57

54 0

X-X~ 1 X-XXX---- -Xe X X--X -x----NX -20 04MB

c44

-43 -1311P

47 x-x tx A e Xx x -20

5MB

36-1035 -0 -fX--Xx-x-X--X- - Xx-x-X-X-X XXx x shyx- X -x- xx IIIIx- ~x yy X- 30 x-X - Xx x-X-X -x -X x-x-U

IxIIF 1 1T1 1 1 1l I 1 1 l I 1 1 1 1 1 1 I Io X I 1 1 1 1 1 1 I I-fU I 3 1731 4 28 1327 0 24 8 22 19 3 17 31 4 28 125 9 23 6 20 4 8 - dAN 1968 FEB MAR APR MAY JUN JUL AUG SEPT OCT NOV DEC 1968

I FIGURE 3-Walops Island Va (370 50N75 029W) analyzed values extracted from weekly 5 2- and 04-mb charts

centered at or very near the North Pole However on- a typical summertime 04-mb chart most reported rocketsonde winds exhibit significant southerly corn-ponents If these winds- were to be given full weight in the analysis the resulting pattern would consist of contours oriented from- southeast to northwest spiraling toward a high center located apparently over northern Europe

The prevalence of positive meridional components in summertime rocketsonde winds has been noted previously (Miers and Beyers 1964) Studies (Reed et al 1966) based on MRN data for several summers have demonstrated that the meridional wind corn-ponent resulting from the diurnal tide reaches maxi-mum southerly strength at about noon local time Because most MRN firings occur near local noon

the measured winds naturally contain this component Although no adjustments were made in individual reports the analysis procedure includes suitable compensation Differences in the reported winds and orientation of the contours may be quite pronounced especially on the summertime charts Strong westerly winds of winter usually mask the weak diurnal com-ponent but there is a possibility that this component may contribute to some bias in analysis during periods of weak circulation

Although careful consideration of high-level data allows a broad-scale depiction of circulation patterns up to 04 rb the -sparsity of reports requires an increasing amount of subjectivity as the analysis pro-ceeds to this high level As yet the analyst has little in the way of synoptic models for guidance with respect to the probable contour and isotherm patterns and the phase relation between these patterns in areas of sparse data The geographical area of analy-sis for the charts has thus been reduced in accordance with the available data The justification for some analyses depends on the interpretation of the limited am6unt of data in such a way as to portray a co-herent sequence of synoptic events In spite of these factors surprisingly little alteration in the principal features of the circulation and temperature distribu-tion shown in the final analysis can be made without inordinately violating spine of the data In general the contours and isotherms -depicted are felt to be good approximations to the flow and temperature patterns at these levels Even so the same degree of accuracy that is found customarily in the analysis of charts at lower levels should not be expected

A contour interval of 320-geopotential meters (gpm) was used throughout- the year In addition

intermediate dashed contours were -used to outline

areas of relatively weak gradient especially during the spring and fall changeover periods Isotherms were drawn and labeled at 5C intervals

DISCUSSION OF THE 1968 CHARTS

The temperature and circulation anomalies assoshyciated with the major stratospheric warming that began in December 1967 (Johnson 1969 Staff 1970) persisted into the beginning of 1968 Maximum temperatures bad been observed at the end of Deshycember with a reversal of the normal wintertime temperature gradient between the North Pole and middle latitudes occurring first at the highest levels then proceeding downward to lower levels Thus at 5 mb on January 3 a wave-two pattern in the isoshytherms and contours was clearly seen with the warm air stretching over the Pole associated with -the two cyclones and with the cold air in the Bering Sea and the Atlantic Ocean associated with the two antishycyclones At 2 nib cold air had returned to the polar area with a warm aiea apparent over western Canada Hydrostatically consistent with this situation was a weakening of the circulation at 2 mb and a disapshypearance of the North Atlantic anticyclone at the 04-mb level with a strong anticyclone apparent in the eastern Pacific The major effects of the stratoshyspheric warming had thus diminished at the upper levels but were propagating downward with time and were still evident at lower altitudes By January 10 anticyclonic circulation dominated the polar reshygion at 5 and 2 mb but at 04 mb the polar cyclone had become reestablished During the next week the transition back to a relatively undisturbed westerly circulation could -be noted at 2 mb and by January 24 this became the pattern at the 5-mb level

During February the polar cyclone intensified at all levels but did not attain the depth reached before the warming The cold air at 5 and 2 mb was someshywhat displaced from the Pole toward northern Canada

- whereas at 04 mb warm air extending from northern Siberia dominated the polar area Although perturbashytions in the temperature fields at high latitudes were noted throughout February and March no significant departures from the basic westerly circulation of the polar vortex were observed The final springtime change from winter to sumshymer conditions could be seen at the end of March at 5 and 2 mrb A warm area was first seen north of Alaska and moved over the polar region In associashytion with the warm area anticyclonic circulation developed in mid-April over the Kamchatka-Alaska

4

region The anticyclonic circulation was displaced northward and an easterly circulation dominated the polar region by the end of April The cyclonic circulation with its associated cold westerlies was displaced southward during May as the polar anti-cyclone intensified and expanded By the end of May the middle and upper stratosphere over the entire Northern Hemisphere was under the influence of sum-mer easterly circulation with the warm air centered at the Pole

The summertime polar anticyclone warmed further during June and gradually intensified Peak tempera-ture and height at the Pole were reached toward the beginning of July with maximum wind reported near subtropical latitudes Thereafter the anticyclone de-cayed slowly as the duration of sunshine decreased in Arctic latitudes Cyclonic circulation formed in the polar area at the end of August and spread as the high latitudes cooled The easterly circulation was displaced southward in the form of cellular ridges reaching low latitudes at the end of September and merging into the subtropical circulation Thus by October westerly circulation predominated over mid-dIe and high latitudes of the Northern Hemisphere stratosphere in low latitudes a variable easterly circulation was associated with fluctuations of the position of the subtropical ridge

During October November and December the polar cyclone deepened accompanied by increasing westerly winds over most of the area However several eastward pulsations of the Aleutian anticy-clone resulted in disturbances of the westerly flow over Alaska and northwestern Canada The anti-cyclone first appeared on November 6 as a weak disturbance at 5 mb over the eastern Pacific By November 20 the anticyclone was found over Alaska at all analysis levels Rapid intensification as well as an eastward movement occurred during the next week affecting the circulation as far east as Fort Churchill Canada After the initial pulse the anti-cyclone retrograded but it persisted although less intense during the rest of December High tempera-

tures were seen during thisperiod in a warm ridge stretching from the Caribbean to southern Europe and across Asia to eastern Siberia This subtropical system sloped northward with height in hydrostatic response to the warm air at higher levels By Decemshyher 18 the warm air at 2 mb over southern Europe exhibited measured temperatures higher than OC At the same time the axis of cold air elongated and split with one center visible ov6r central Canada At the 04-mb level the data indicated a cbnsidershyably disturbed temperature field during the last week of the year with warm air-apparent over the polar region and cold air displaced southward

The principal features of the circulation during 1968 at five representative rocket launch sites may be seen in the time sections (figs 1-5) of analyzed height and temperature values extracted from the weekly charts The annual trend of the height and temperature values is most pronounced at the middleshyand higllatitude stations (figs 1-3) with the largest range of values occurring in the more northerly statiois (Johnson and Gelman 1968) Superimposed on this annual trend characterized by maximum values in summer and minimum values in winter are various perturbations The largest of these perturbashytions was in January and was associated with the major stratospheric warming mentioned above Smaller scale disturbances associated with movements of the Aleutian anticyclone were seen in November and December At the tropical station of Antigua West Indies Associated State (WIAS) the range of values is very small with only very minor perturbashytions affecting the station (fig 5) There is a sugshygestion however of a double maximum at the time of the equinoxes associated with the semiannual variashytion in temperature and wind and related to the seasonal migration of the subtropical anticyclone as seen in the charts At the subtropical station of White Sands N Me (fig 4) a combination of the major annual variation and the semiannual variation is apparent (This discussion prepared by Melvyn E Gelman)

5

ACKNOWLEDGMENTS

Funds for the analysis of the 1968 chart series were provided by the National Aeronautics and Space Administration under contract P 44664 (G)

Personnel actively engaged in the analysis projectwere Project Manager F G Finger Project Analyst

M E Gelman Research Consultant A 1 Miller Data Processing D L Griffith and J A Booth and Computer Operations K W Johnson

Ballard H N A Review of Seven Papers Concern-ing the Measurement of Temperature in the Stratosphere and Mesosphere ECOM 5125 US Army Electronics Command Fort Mon-mouth NJ May 1967 67 pp

Barr W Correctionsof RadiationalError of Radio-sonde Temperature Measurements in the Stratos-pher US Army Electronics Command Fort Monmouth NJ 1966 (personal communication)

Drews W A A Thermistor Arrangement to Im-prove Temperature Measurement at High Alti-tude NASA Contract Report 533 Aug 1966 29 pp

Environmental Science Services Administration Weather Bureau Constant Pressure Charts MF-494 National Weather Records Center Ashe-ville NC 1968

Finger F G Woolf H M and Anderson C E A Method for Objective Analysis of Stratos-pheric Constant-Pressure Charts Monthly Weather Review Vol 93 No 10 Oct 1965 pp 619-638

Finger F_ G Woolf H M and Anderson C E Synoptic Analyses of the 5- 2- and 04-Milli-bar Surfaces for the IQSY Period Monthly Weather Review Vol 94 No 11 Nov 1966 pp 651-661

Johnson K W A Preliminary Study of the Strato-spheric Warming of December 1967- January 1968 Monthly Weather Review Vol 97 No 8 Aug 1969 pp 553-564

Johnson K W and Gelman M E Temperature and Height Variability in the Middle and Upper Stratosphere During 1964-1966 as Determined From Constant Pressure Charts Monthly Weather Review Vol 96 No 6 June 1968 pp 371-382

Mclnturff R M and Finger F G The Compati-bility of Radiosonde Data at Stratospheric Levels

6

Over the Northern Hemisphere ESSA Techshynical Memorandum WBTM DATAC 2 Silver Spring Md Dec 1968 61 pp

Miers B T and Beyers N J Rocketsonde Wind and Temperature Measurements Between 30 and 70 Km for Selected Stations Journalof Applied Meteorolgy Vol 3 No 1 Feb 1964 pp 16-26

Miller A J A Note on the Variability of Ternshyperature as Indicated by Rocletsonde Thermisshytors Journal of Applied Meteorology Vol 8

No 1 Feb 1969 pp 172-174

Miller A J and Schmidlin F J Rocketsonde Repeatability and Stratospheric Variability Journal of Applied Meteorology Vol 10 No 2 April 1971 pp 320-327

Muench H S Temperature Measurements in the 30- to 40-Kilometer Region Monthly Weather Review Vol 99 No 2 Feb 1971 pp 158-160

Reed R J McKenzie D J and Vyverberg J C Diurnal Tidal Motions Between 30 and 60 Kilometers in Summer Journal of the Atmxrsshypheric Sciences Vol 23 No 4 July 1966 pp 416-423

Staff Upper Air Branch National Meteorological Center Weekly Synoptic Analyses 5- 2- and 04-Mb Surfaces for 1964 (Based on Observations of the Meteorological Rocket Network During the IQSY ESSA Technical Report WB 2 Silver Spring Md Apr 1967a 176 pp

Staff Upper Air Branch National Meteorological Center Weekly Synoptic Analyses 5- 2- and 04-Mb Surfaces for 1965 (Based on Observa tions of the Meteorological Rocket Network During the IQSY ESSA Technical Report WB 3 Silver Spring Md Aug 1967b 173 pp

Staff Upper Air Branch National Meteorological Center Weekly Synoptic Analyses 5- 2- and 04-Mb Surfaces for 1966 [Based on Mete orological Rocketsonde and High-Level Rawinshysonde Observations] ESSA Technical Report WB 9 Silver Spring Md Jan 1969 169 pp

Staff Upper Air Branch National Meteorological Center Weekly Synoptic Analyses 5- 2- and 04-Millibar Surfaces for 1967 (Based on Meteshyorological Rocketsonde and High-Level Rawinshysonde Observations) ESSA Technical Report WB 12 Silver Spring Md Jan 1970 169 pp

World Data Center A Meteorology Data Report Meteorological Rocket Network Firings 1968 Vol V National Weather Records Center Asheshyville NC 1969

58

57 H --TEMP X-x

56

55

54

53

52 x-1

51 X X-Xx 04M8BX 3

-5045 shy

44shy

43_ bull 42 xlXX-~ -x X--~ -xxlt--- x- ~~X-X

41 --X- _xXx -

-40 X 2M8 -JAN1396MO shy

54Wa JcV~Ax- - - - - - - - -X X X - - 50 II 37-13

36 - ~x-X-X-X-X_x_xxxx -0

534 X I -X-

3 17 31 14 28 13 27 07 94 8 22 5 19 3 T 31 14 28 11 25 9 23 6 20 4 18 7

JAN 1968 FEB MAR APR 10AY MN JUL AUG SEPT OCT NOV DEC 1968

FIGURE 1-Fort Greely Alaska (64000N 145044W) analyzed values extracted from weekly 5- 2- and 04-mb charts

TEMP x57

56

55

- _S3~~ X--ex- X-x-xxX-x-x-x- -0--^ X-x-xx-x-X x k X- X-XXx

52X N51 842MB 2x48 O -3-50

E M

Fia yda

54M

536X

37I -o

i-X-x X17-- xxX x lx 6 YX X xx X Xx -l -5040 --- 244B ILI Ix 1-Z

13 7 P I D 7

36 041 -307311327IpR X 8I

FEB MAR MAY 1I AVG SEPT OCT NOV DEC 1968

35 17 1142 8MAV 19 2

JAN 1968 _APR_ N

FIGURE 2--ort Churchill Canada (W4deg4N 9349W) analyzed values extracted fromn weekly 5- 2-and 04-rob charts

TEMP x-x

57

54 0

X-X~ 1 X-XXX---- -Xe X X--X -x----NX -20 04MB

c44

-43 -1311P

47 x-x tx A e Xx x -20

5MB

36-1035 -0 -fX--Xx-x-X--X- - Xx-x-X-X-X XXx x shyx- X -x- xx IIIIx- ~x yy X- 30 x-X - Xx x-X-X -x -X x-x-U

IxIIF 1 1T1 1 1 1l I 1 1 l I 1 1 1 1 1 1 I Io X I 1 1 1 1 1 1 I I-fU I 3 1731 4 28 1327 0 24 8 22 19 3 17 31 4 28 125 9 23 6 20 4 8 - dAN 1968 FEB MAR APR MAY JUN JUL AUG SEPT OCT NOV DEC 1968

I FIGURE 3-Walops Island Va (370 50N75 029W) analyzed values extracted from weekly 5 2- and 04-mb charts

region The anticyclonic circulation was displaced northward and an easterly circulation dominated the polar region by the end of April The cyclonic circulation with its associated cold westerlies was displaced southward during May as the polar anti-cyclone intensified and expanded By the end of May the middle and upper stratosphere over the entire Northern Hemisphere was under the influence of sum-mer easterly circulation with the warm air centered at the Pole

The summertime polar anticyclone warmed further during June and gradually intensified Peak tempera-ture and height at the Pole were reached toward the beginning of July with maximum wind reported near subtropical latitudes Thereafter the anticyclone de-cayed slowly as the duration of sunshine decreased in Arctic latitudes Cyclonic circulation formed in the polar area at the end of August and spread as the high latitudes cooled The easterly circulation was displaced southward in the form of cellular ridges reaching low latitudes at the end of September and merging into the subtropical circulation Thus by October westerly circulation predominated over mid-dIe and high latitudes of the Northern Hemisphere stratosphere in low latitudes a variable easterly circulation was associated with fluctuations of the position of the subtropical ridge

During October November and December the polar cyclone deepened accompanied by increasing westerly winds over most of the area However several eastward pulsations of the Aleutian anticy-clone resulted in disturbances of the westerly flow over Alaska and northwestern Canada The anti-cyclone first appeared on November 6 as a weak disturbance at 5 mb over the eastern Pacific By November 20 the anticyclone was found over Alaska at all analysis levels Rapid intensification as well as an eastward movement occurred during the next week affecting the circulation as far east as Fort Churchill Canada After the initial pulse the anti-cyclone retrograded but it persisted although less intense during the rest of December High tempera-

tures were seen during thisperiod in a warm ridge stretching from the Caribbean to southern Europe and across Asia to eastern Siberia This subtropical system sloped northward with height in hydrostatic response to the warm air at higher levels By Decemshyher 18 the warm air at 2 mb over southern Europe exhibited measured temperatures higher than OC At the same time the axis of cold air elongated and split with one center visible ov6r central Canada At the 04-mb level the data indicated a cbnsidershyably disturbed temperature field during the last week of the year with warm air-apparent over the polar region and cold air displaced southward

The principal features of the circulation during 1968 at five representative rocket launch sites may be seen in the time sections (figs 1-5) of analyzed height and temperature values extracted from the weekly charts The annual trend of the height and temperature values is most pronounced at the middleshyand higllatitude stations (figs 1-3) with the largest range of values occurring in the more northerly statiois (Johnson and Gelman 1968) Superimposed on this annual trend characterized by maximum values in summer and minimum values in winter are various perturbations The largest of these perturbashytions was in January and was associated with the major stratospheric warming mentioned above Smaller scale disturbances associated with movements of the Aleutian anticyclone were seen in November and December At the tropical station of Antigua West Indies Associated State (WIAS) the range of values is very small with only very minor perturbashytions affecting the station (fig 5) There is a sugshygestion however of a double maximum at the time of the equinoxes associated with the semiannual variashytion in temperature and wind and related to the seasonal migration of the subtropical anticyclone as seen in the charts At the subtropical station of White Sands N Me (fig 4) a combination of the major annual variation and the semiannual variation is apparent (This discussion prepared by Melvyn E Gelman)

5

ACKNOWLEDGMENTS

Funds for the analysis of the 1968 chart series were provided by the National Aeronautics and Space Administration under contract P 44664 (G)

Personnel actively engaged in the analysis projectwere Project Manager F G Finger Project Analyst

M E Gelman Research Consultant A 1 Miller Data Processing D L Griffith and J A Booth and Computer Operations K W Johnson

Ballard H N A Review of Seven Papers Concern-ing the Measurement of Temperature in the Stratosphere and Mesosphere ECOM 5125 US Army Electronics Command Fort Mon-mouth NJ May 1967 67 pp

Barr W Correctionsof RadiationalError of Radio-sonde Temperature Measurements in the Stratos-pher US Army Electronics Command Fort Monmouth NJ 1966 (personal communication)

Drews W A A Thermistor Arrangement to Im-prove Temperature Measurement at High Alti-tude NASA Contract Report 533 Aug 1966 29 pp

Environmental Science Services Administration Weather Bureau Constant Pressure Charts MF-494 National Weather Records Center Ashe-ville NC 1968

Finger F G Woolf H M and Anderson C E A Method for Objective Analysis of Stratos-pheric Constant-Pressure Charts Monthly Weather Review Vol 93 No 10 Oct 1965 pp 619-638

Finger F_ G Woolf H M and Anderson C E Synoptic Analyses of the 5- 2- and 04-Milli-bar Surfaces for the IQSY Period Monthly Weather Review Vol 94 No 11 Nov 1966 pp 651-661

Johnson K W A Preliminary Study of the Strato-spheric Warming of December 1967- January 1968 Monthly Weather Review Vol 97 No 8 Aug 1969 pp 553-564

Johnson K W and Gelman M E Temperature and Height Variability in the Middle and Upper Stratosphere During 1964-1966 as Determined From Constant Pressure Charts Monthly Weather Review Vol 96 No 6 June 1968 pp 371-382

Mclnturff R M and Finger F G The Compati-bility of Radiosonde Data at Stratospheric Levels

6

Over the Northern Hemisphere ESSA Techshynical Memorandum WBTM DATAC 2 Silver Spring Md Dec 1968 61 pp

Miers B T and Beyers N J Rocketsonde Wind and Temperature Measurements Between 30 and 70 Km for Selected Stations Journalof Applied Meteorolgy Vol 3 No 1 Feb 1964 pp 16-26

Miller A J A Note on the Variability of Ternshyperature as Indicated by Rocletsonde Thermisshytors Journal of Applied Meteorology Vol 8

No 1 Feb 1969 pp 172-174

Miller A J and Schmidlin F J Rocketsonde Repeatability and Stratospheric Variability Journal of Applied Meteorology Vol 10 No 2 April 1971 pp 320-327

Muench H S Temperature Measurements in the 30- to 40-Kilometer Region Monthly Weather Review Vol 99 No 2 Feb 1971 pp 158-160

Reed R J McKenzie D J and Vyverberg J C Diurnal Tidal Motions Between 30 and 60 Kilometers in Summer Journal of the Atmxrsshypheric Sciences Vol 23 No 4 July 1966 pp 416-423

Staff Upper Air Branch National Meteorological Center Weekly Synoptic Analyses 5- 2- and 04-Mb Surfaces for 1964 (Based on Observations of the Meteorological Rocket Network During the IQSY ESSA Technical Report WB 2 Silver Spring Md Apr 1967a 176 pp

Staff Upper Air Branch National Meteorological Center Weekly Synoptic Analyses 5- 2- and 04-Mb Surfaces for 1965 (Based on Observa tions of the Meteorological Rocket Network During the IQSY ESSA Technical Report WB 3 Silver Spring Md Aug 1967b 173 pp

Staff Upper Air Branch National Meteorological Center Weekly Synoptic Analyses 5- 2- and 04-Mb Surfaces for 1966 [Based on Mete orological Rocketsonde and High-Level Rawinshysonde Observations] ESSA Technical Report WB 9 Silver Spring Md Jan 1969 169 pp

Staff Upper Air Branch National Meteorological Center Weekly Synoptic Analyses 5- 2- and 04-Millibar Surfaces for 1967 (Based on Meteshyorological Rocketsonde and High-Level Rawinshysonde Observations) ESSA Technical Report WB 12 Silver Spring Md Jan 1970 169 pp

World Data Center A Meteorology Data Report Meteorological Rocket Network Firings 1968 Vol V National Weather Records Center Asheshyville NC 1969

58

57 H --TEMP X-x

56

55

54

53

52 x-1

51 X X-Xx 04M8BX 3

-5045 shy

44shy

43_ bull 42 xlXX-~ -x X--~ -xxlt--- x- ~~X-X

41 --X- _xXx -

-40 X 2M8 -JAN1396MO shy

54Wa JcV~Ax- - - - - - - - -X X X - - 50 II 37-13

36 - ~x-X-X-X-X_x_xxxx -0

534 X I -X-

3 17 31 14 28 13 27 07 94 8 22 5 19 3 T 31 14 28 11 25 9 23 6 20 4 18 7

JAN 1968 FEB MAR APR 10AY MN JUL AUG SEPT OCT NOV DEC 1968

FIGURE 1-Fort Greely Alaska (64000N 145044W) analyzed values extracted from weekly 5- 2- and 04-mb charts

TEMP x57

56

55

- _S3~~ X--ex- X-x-xxX-x-x-x- -0--^ X-x-xx-x-X x k X- X-XXx

52X N51 842MB 2x48 O -3-50

E M

Fia yda

54M

536X

37I -o

i-X-x X17-- xxX x lx 6 YX X xx X Xx -l -5040 --- 244B ILI Ix 1-Z

13 7 P I D 7

36 041 -307311327IpR X 8I

FEB MAR MAY 1I AVG SEPT OCT NOV DEC 1968

35 17 1142 8MAV 19 2

JAN 1968 _APR_ N

FIGURE 2--ort Churchill Canada (W4deg4N 9349W) analyzed values extracted fromn weekly 5- 2-and 04-rob charts

TEMP x-x

57

54 0

X-X~ 1 X-XXX---- -Xe X X--X -x----NX -20 04MB

c44

-43 -1311P

47 x-x tx A e Xx x -20

5MB

36-1035 -0 -fX--Xx-x-X--X- - Xx-x-X-X-X XXx x shyx- X -x- xx IIIIx- ~x yy X- 30 x-X - Xx x-X-X -x -X x-x-U

IxIIF 1 1T1 1 1 1l I 1 1 l I 1 1 1 1 1 1 I Io X I 1 1 1 1 1 1 I I-fU I 3 1731 4 28 1327 0 24 8 22 19 3 17 31 4 28 125 9 23 6 20 4 8 - dAN 1968 FEB MAR APR MAY JUN JUL AUG SEPT OCT NOV DEC 1968

I FIGURE 3-Walops Island Va (370 50N75 029W) analyzed values extracted from weekly 5 2- and 04-mb charts

ACKNOWLEDGMENTS

Funds for the analysis of the 1968 chart series were provided by the National Aeronautics and Space Administration under contract P 44664 (G)

Personnel actively engaged in the analysis projectwere Project Manager F G Finger Project Analyst

M E Gelman Research Consultant A 1 Miller Data Processing D L Griffith and J A Booth and Computer Operations K W Johnson

Ballard H N A Review of Seven Papers Concern-ing the Measurement of Temperature in the Stratosphere and Mesosphere ECOM 5125 US Army Electronics Command Fort Mon-mouth NJ May 1967 67 pp

Barr W Correctionsof RadiationalError of Radio-sonde Temperature Measurements in the Stratos-pher US Army Electronics Command Fort Monmouth NJ 1966 (personal communication)

Drews W A A Thermistor Arrangement to Im-prove Temperature Measurement at High Alti-tude NASA Contract Report 533 Aug 1966 29 pp

Environmental Science Services Administration Weather Bureau Constant Pressure Charts MF-494 National Weather Records Center Ashe-ville NC 1968

Finger F G Woolf H M and Anderson C E A Method for Objective Analysis of Stratos-pheric Constant-Pressure Charts Monthly Weather Review Vol 93 No 10 Oct 1965 pp 619-638

Finger F_ G Woolf H M and Anderson C E Synoptic Analyses of the 5- 2- and 04-Milli-bar Surfaces for the IQSY Period Monthly Weather Review Vol 94 No 11 Nov 1966 pp 651-661

Johnson K W A Preliminary Study of the Strato-spheric Warming of December 1967- January 1968 Monthly Weather Review Vol 97 No 8 Aug 1969 pp 553-564

Johnson K W and Gelman M E Temperature and Height Variability in the Middle and Upper Stratosphere During 1964-1966 as Determined From Constant Pressure Charts Monthly Weather Review Vol 96 No 6 June 1968 pp 371-382

Mclnturff R M and Finger F G The Compati-bility of Radiosonde Data at Stratospheric Levels

6

Over the Northern Hemisphere ESSA Techshynical Memorandum WBTM DATAC 2 Silver Spring Md Dec 1968 61 pp

Miers B T and Beyers N J Rocketsonde Wind and Temperature Measurements Between 30 and 70 Km for Selected Stations Journalof Applied Meteorolgy Vol 3 No 1 Feb 1964 pp 16-26

Miller A J A Note on the Variability of Ternshyperature as Indicated by Rocletsonde Thermisshytors Journal of Applied Meteorology Vol 8

No 1 Feb 1969 pp 172-174

Miller A J and Schmidlin F J Rocketsonde Repeatability and Stratospheric Variability Journal of Applied Meteorology Vol 10 No 2 April 1971 pp 320-327

Muench H S Temperature Measurements in the 30- to 40-Kilometer Region Monthly Weather Review Vol 99 No 2 Feb 1971 pp 158-160

Reed R J McKenzie D J and Vyverberg J C Diurnal Tidal Motions Between 30 and 60 Kilometers in Summer Journal of the Atmxrsshypheric Sciences Vol 23 No 4 July 1966 pp 416-423

Staff Upper Air Branch National Meteorological Center Weekly Synoptic Analyses 5- 2- and 04-Mb Surfaces for 1964 (Based on Observations of the Meteorological Rocket Network During the IQSY ESSA Technical Report WB 2 Silver Spring Md Apr 1967a 176 pp

Staff Upper Air Branch National Meteorological Center Weekly Synoptic Analyses 5- 2- and 04-Mb Surfaces for 1965 (Based on Observa tions of the Meteorological Rocket Network During the IQSY ESSA Technical Report WB 3 Silver Spring Md Aug 1967b 173 pp

Staff Upper Air Branch National Meteorological Center Weekly Synoptic Analyses 5- 2- and 04-Mb Surfaces for 1966 [Based on Mete orological Rocketsonde and High-Level Rawinshysonde Observations] ESSA Technical Report WB 9 Silver Spring Md Jan 1969 169 pp

Staff Upper Air Branch National Meteorological Center Weekly Synoptic Analyses 5- 2- and 04-Millibar Surfaces for 1967 (Based on Meteshyorological Rocketsonde and High-Level Rawinshysonde Observations) ESSA Technical Report WB 12 Silver Spring Md Jan 1970 169 pp

World Data Center A Meteorology Data Report Meteorological Rocket Network Firings 1968 Vol V National Weather Records Center Asheshyville NC 1969

58

57 H --TEMP X-x

56

55

54

53

52 x-1

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44shy

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534 X I -X-

3 17 31 14 28 13 27 07 94 8 22 5 19 3 T 31 14 28 11 25 9 23 6 20 4 18 7

JAN 1968 FEB MAR APR 10AY MN JUL AUG SEPT OCT NOV DEC 1968

FIGURE 1-Fort Greely Alaska (64000N 145044W) analyzed values extracted from weekly 5- 2- and 04-mb charts

TEMP x57

56

55

- _S3~~ X--ex- X-x-xxX-x-x-x- -0--^ X-x-xx-x-X x k X- X-XXx

52X N51 842MB 2x48 O -3-50

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536X

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13 7 P I D 7

36 041 -307311327IpR X 8I

FEB MAR MAY 1I AVG SEPT OCT NOV DEC 1968

35 17 1142 8MAV 19 2

JAN 1968 _APR_ N

FIGURE 2--ort Churchill Canada (W4deg4N 9349W) analyzed values extracted fromn weekly 5- 2-and 04-rob charts

TEMP x-x

57

54 0

X-X~ 1 X-XXX---- -Xe X X--X -x----NX -20 04MB

c44

-43 -1311P

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36-1035 -0 -fX--Xx-x-X--X- - Xx-x-X-X-X XXx x shyx- X -x- xx IIIIx- ~x yy X- 30 x-X - Xx x-X-X -x -X x-x-U

IxIIF 1 1T1 1 1 1l I 1 1 l I 1 1 1 1 1 1 I Io X I 1 1 1 1 1 1 I I-fU I 3 1731 4 28 1327 0 24 8 22 19 3 17 31 4 28 125 9 23 6 20 4 8 - dAN 1968 FEB MAR APR MAY JUN JUL AUG SEPT OCT NOV DEC 1968

I FIGURE 3-Walops Island Va (370 50N75 029W) analyzed values extracted from weekly 5 2- and 04-mb charts

58

57 H --TEMP X-x

56

55

54

53

52 x-1

51 X X-Xx 04M8BX 3

-5045 shy

44shy

43_ bull 42 xlXX-~ -x X--~ -xxlt--- x- ~~X-X

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534 X I -X-

3 17 31 14 28 13 27 07 94 8 22 5 19 3 T 31 14 28 11 25 9 23 6 20 4 18 7

JAN 1968 FEB MAR APR 10AY MN JUL AUG SEPT OCT NOV DEC 1968

FIGURE 1-Fort Greely Alaska (64000N 145044W) analyzed values extracted from weekly 5- 2- and 04-mb charts

TEMP x57

56

55

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52X N51 842MB 2x48 O -3-50

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13 7 P I D 7

36 041 -307311327IpR X 8I

FEB MAR MAY 1I AVG SEPT OCT NOV DEC 1968

35 17 1142 8MAV 19 2

JAN 1968 _APR_ N

FIGURE 2--ort Churchill Canada (W4deg4N 9349W) analyzed values extracted fromn weekly 5- 2-and 04-rob charts

TEMP x-x

57

54 0

X-X~ 1 X-XXX---- -Xe X X--X -x----NX -20 04MB

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IxIIF 1 1T1 1 1 1l I 1 1 l I 1 1 1 1 1 1 I Io X I 1 1 1 1 1 1 I I-fU I 3 1731 4 28 1327 0 24 8 22 19 3 17 31 4 28 125 9 23 6 20 4 8 - dAN 1968 FEB MAR APR MAY JUN JUL AUG SEPT OCT NOV DEC 1968

I FIGURE 3-Walops Island Va (370 50N75 029W) analyzed values extracted from weekly 5 2- and 04-mb charts

TEMP x57

56

55

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FEB MAR MAY 1I AVG SEPT OCT NOV DEC 1968

35 17 1142 8MAV 19 2

JAN 1968 _APR_ N

FIGURE 2--ort Churchill Canada (W4deg4N 9349W) analyzed values extracted fromn weekly 5- 2-and 04-rob charts

TEMP x-x

57

54 0

X-X~ 1 X-XXX---- -Xe X X--X -x----NX -20 04MB

c44

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IxIIF 1 1T1 1 1 1l I 1 1 l I 1 1 1 1 1 1 I Io X I 1 1 1 1 1 1 I I-fU I 3 1731 4 28 1327 0 24 8 22 19 3 17 31 4 28 125 9 23 6 20 4 8 - dAN 1968 FEB MAR APR MAY JUN JUL AUG SEPT OCT NOV DEC 1968

I FIGURE 3-Walops Island Va (370 50N75 029W) analyzed values extracted from weekly 5 2- and 04-mb charts

TEMP x-x

57

54 0

X-X~ 1 X-XXX---- -Xe X X--X -x----NX -20 04MB

c44

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36-1035 -0 -fX--Xx-x-X--X- - Xx-x-X-X-X XXx x shyx- X -x- xx IIIIx- ~x yy X- 30 x-X - Xx x-X-X -x -X x-x-U

IxIIF 1 1T1 1 1 1l I 1 1 l I 1 1 1 1 1 1 I Io X I 1 1 1 1 1 1 I I-fU I 3 1731 4 28 1327 0 24 8 22 19 3 17 31 4 28 125 9 23 6 20 4 8 - dAN 1968 FEB MAR APR MAY JUN JUL AUG SEPT OCT NOV DEC 1968

I FIGURE 3-Walops Island Va (370 50N75 029W) analyzed values extracted from weekly 5 2- and 04-mb charts

56

55 54 0

1 AN X X Kx X--X X NXKxXX Nx~~ A XN x _ 0 XX--XeX--XXX-eX Nx XIxX-X-XX-x_ X-) X X -X-XxX X X XX---X -20-- X X- xxx-( XX X

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AN 1968 FEB MAR APR MAY JUN JUL AUG SEPT OCT NOV DEC 1968

FIGURE 4-White Sands N Mex (82 023N 10629W) analyzed values extracted from weekly 5- 2 and 04-mb charts

rEMP x-x

56

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JAN1968 FEB MAR APR MAY JUN JUL AUG SEPT OCT NOV DEC1968

FIGURE 5-Antigua WIAS (170 09N 6147W) analyzed values extracted from weekly 5- 2- and 04-mb charts

STATION MODEL AND REPORTING ROCKET STATIONS

V1

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BARKING SAJDSL WS

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bull PRIMROSE LAK

WALOPS ISLAND

OGREEN RIVER OTONOPAH

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FIGURE 5-Antigua WIAS (170 09N 6147W) analyzed values extracted from weekly 5- 2- and 04-mb charts

STATION MODEL AND REPORTING ROCKET STATIONS

V1

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BARKING SAJDSL WS

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bull PRIMROSE LAK

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OGREEN RIVER OTONOPAH

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V1

O FT OREL

BARKING SAJDSL WS

O FT CHURGILL

bull PRIMROSE LAK

WALOPS ISLAND

OGREEN RIVER OTONOPAH

GEO SCAlE T~R[ISSUtSUIA CZS SAN 9 PT MUGUSHIc WItD -COHlSTAN NICOLAS

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5-MB CHART 4014TOUR INTERVAL30G

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5-MB CHART CONTOUR 32ooPINTERVFEB 211968 AWOUASM

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04MBCHA T OMTMURINTERVAL 320 GPM

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04-MB CHART CONOUR 3 FEB21968 ISOTHERM INTERVAL 50

jAlllt IUS

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5-MB CHART CONTOURIR0 MAR 61968 1-THE MINT

2-MB CHART ISOTHERM INTERVAL 5CMAR 6 1968 i

00

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MAR 271968 ISOTHERM INTERVAL C

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2-MB CHART INTERVAL 320 GPM

SOTMER+ 500 MAY 81968 CONTOUR

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4272

400

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AI

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04-MB CHART - NTERVA 300GR JAN 10 1968 I M

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5-MB CHART 4014TOUR INTERVAL30G

JAN 24 1968 ISOTHERM INTERVAL 5-10

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x

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FEB 71968 IEV 5O-CU

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5-MB CHART CONTOUR 32ooPINTERVFEB 211968 AWOUASM

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04MBCHA T OMTMURINTERVAL 320 GPM

FEB 211968 ISOTHERM INTERVAL 5oC

04-MB CHART

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04-MB CHART CONOUR 3 FEB21968 ISOTHERM INTERVAL 50

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70

5-MB CHART CONTOURIR0 MAR 61968 1-THE MINT

2-MB CHART ISOTHERM INTERVAL 5CMAR 6 1968 i

00

1 0 4-MB CHART NORITRA32QP 8 MAR 6 1I968 S01HERM hNTERVAL 5-c

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5-c

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04-MB CHART ONTOUR INTERVAL 32 GoP

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MAR 271968 ISOTHERM INTERVAL C

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2-MB CHART - -- I GPM

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5-MB CH T CONTOUR 6PMINTERVALo320 50CMAY 1 1968 -- - ISOTHERM INTERVAL

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2-MB CHART INTERVAL 320 GPM

SOTMER+ 500 MAY 81968 CONTOUR

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AI

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04-MB CHART - NTERVA 300GR JAN 10 1968 I M

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5-MB CHART 4014TOUR INTERVAL30G

JAN 24 1968 ISOTHERM INTERVAL 5-10

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FEB 71968 IEV 5O-CU

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5-MB CHART CONTOUR 32ooPINTERVFEB 211968 AWOUASM

C

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2-MB CHART CONTOUR 320 GPMINTERVALFEB 211968 ISOTKERM INTRVAL 5-C

04MBCHA T OMTMURINTERVAL 320 GPM

FEB 211968 ISOTHERM INTERVAL 5oC

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04-MB CHART CONOUR 3 FEB21968 ISOTHERM INTERVAL 50

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2-MB CHART ISOTHERM INTERVAL 5CMAR 6 1968 i

00

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04-MB CHART CONTOUR INTERVAL 320 PMMAY 11968 A8ISOTERM 5CINTERVAL

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5-B CHART iMAY81968

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ISOTHERM INTERVAL 5 C

2-MB CHART INTERVAL 320 GPM

SOTMER+ 500 MAY 81968 CONTOUR

IWTRVAL 1I~~pAlCw

4272

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04-MB CHART - NTERVA 300GR JAN 10 1968 I M

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2-MB CHART CJAN 111968 ISOTHERM INTERVAL 5-C

0

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ISOTHERM INTERVAL Ashy

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5-MB CHART 4014TOUR INTERVAL30G

JAN 24 1968 ISOTHERM INTERVAL 5-10

a

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2MB CHART CONTOUR INTERVAL 5 GPM 9 JAN 24 1968 LsoTKFRM Q4oEfvlAL 5-C

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04-MB CHART J3 JAN 24 1968 ISoTHNTERVAL sac

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NERA 2 P5-MB CHARTSOTU ISO VAL 5SCFEB 711968

N A1 i

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FEB 71968 IEV 5O-CU

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04-MB CHART CONTOUR INTERVAL 520

FEB 71968 ISOTHERM INTERVAL5_4tA 5A

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5-MB CHAR o-oA oo FEB 141968 ISOTHERM INTERVAL 5C

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04-MB CHART

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5-MB CHART CONTOUR 32ooPINTERVFEB 211968 AWOUASM

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04MBCHA T OMTMURINTERVAL 320 GPM

FEB 211968 ISOTHERM INTERVAL 5oC

04-MB CHART

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04-MB CHART CONOUR 3 FEB21968 ISOTHERM INTERVAL 50

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5-MB CHART CONTOURIR0 MAR 61968 1-THE MINT

2-MB CHART ISOTHERM INTERVAL 5CMAR 6 1968 i

00

1 0 4-MB CHART NORITRA32QP 8 MAR 6 1I968 S01HERM hNTERVAL 5-c

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MAR 271968 ISOTHERM INTERVAL C

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2-MB CHART C I 5 G ISOTHERM INTERVAL 5C-APR 31968

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APR 171968 IOTHERM INTERVAL 5shy

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CONOU ITEVA 320GPAPR 241968

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2-MB CHART - -- I GPM

APR 241968 ISOTHERM INTERVAL

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CONTOURINTERVAL 320 PM04-MB CHART __- ISOTHER NTERVAL 25- PCNORITRA

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5-B CHART iMAY81968

sLshy CONTOUR INERA 320GP

ISOTHERM INTERVAL 5 C

2-MB CHART INTERVAL 320 GPM

SOTMER+ 500 MAY 81968 CONTOUR

IWTRVAL 1I~~pAlCw

4272

400

-

0M CHAR- CONTOUR INTERVAL320 GPM

AI

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04-MB CHART - NTERVA 300GR JAN 10 1968 I M

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ISOTHERM INTERVAL Ashy

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JAN 24 1968 ISOTHERM INTERVAL 5-10

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2-MB CHART - oA 2 JAN 31 1968 --- _ deg_______L

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FEB 71968 IEV 5O-CU

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FEB 71968 ISOTHERM INTERVAL5_4tA 5A

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5-MB CHAR o-oA oo FEB 141968 ISOTHERM INTERVAL 5C

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FEB 141968 -ISOTHERM INTERVAL FBqai 1

04-MB CHART

FEB 1419 68 ISTEMINTEVAL 5gC

5-MB CHART CONTOUR 32ooPINTERVFEB 211968 AWOUASM

C

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2-MB CHART CONTOUR 320 GPMINTERVALFEB 211968 ISOTKERM INTRVAL 5-C

04MBCHA T OMTMURINTERVAL 320 GPM

FEB 211968 ISOTHERM INTERVAL 5oC

04-MB CHART

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04-MB CHART CONOUR 3 FEB21968 ISOTHERM INTERVAL 50

jAlllt IUS

70

5-MB CHART CONTOURIR0 MAR 61968 1-THE MINT

2-MB CHART ISOTHERM INTERVAL 5CMAR 6 1968 i

00

1 0 4-MB CHART NORITRA32QP 8 MAR 6 1I968 S01HERM hNTERVAL 5-c

I

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5-c

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2-MB CHART COTU-NERA 2 P

MAR 131968ISTEMIERA -L

04-MB CHART ONTOUR INTERVAL 32 GoP

ISOTHERM INTERVAL 5-CMAR 131968

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1

09-

MAR27HISOTHERM INTERVAL 5-0

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2-MB CHART CONTOUR INTERVAL3O GPM

MAR 271968 ISOTHERM INTERVAL C

A 11A deg

04-MB CHART INTERVAL 320 6PM

MAR271968 ISOTHERMITERWA 5C i~~ SOTHE M ASINER S

CZ

APR 31968 CONTOUR INTERVAL6 PM ISOTHERM INTERVAL 5SC

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2-MB CHART C I 5 G ISOTHERM INTERVAL 5C-APR 31968

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5-MB CHART APR1171968

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2-MB CHARTAPR 1741968 -ISOTHERM INTERVAL -

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04-MB CHART CONTOURINTERVAL 520 3PM

APR 171968 IOTHERM INTERVAL 5shy

C3

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CONOU ITEVA 320GPAPR 241968

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2-MB CHART - -- I GPM

APR 241968 ISOTHERM INTERVAL

N

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CONTOURINTERVAL 320 PM04-MB CHART __- ISOTHER NTERVAL 25- PCNORITRA

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5-MB CH T CONTOUR 6PMINTERVALo320 50CMAY 1 1968 -- - ISOTHERM INTERVAL

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04-MB CHART CONTOUR INTERVAL 320 PMMAY 11968 A8ISOTERM 5CINTERVAL

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5-B CHART iMAY81968

sLshy CONTOUR INERA 320GP

ISOTHERM INTERVAL 5 C

2-MB CHART INTERVAL 320 GPM

SOTMER+ 500 MAY 81968 CONTOUR

IWTRVAL 1I~~pAlCw

4272

400

-

0M CHAR- CONTOUR INTERVAL320 GPM

AI

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5-MB CHART C MAY 151968 ISOHER INTERVAL

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53

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04-MB CHART - NTERVA 300GR JAN 10 1968 I M

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2-MB CHART - oA 2 JAN 31 1968 --- _ deg_______L

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N A1 i

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FEB 71968 IEV 5O-CU

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FEB 71968 ISOTHERM INTERVAL5_4tA 5A

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5-MB CHAR o-oA oo FEB 141968 ISOTHERM INTERVAL 5C

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2-MB CHART CONUR INTERL 320 GPM

FEB 141968 -ISOTHERM INTERVAL FBqai 1

04-MB CHART

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5-MB CHART CONTOUR 32ooPINTERVFEB 211968 AWOUASM

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04MBCHA T OMTMURINTERVAL 320 GPM

FEB 211968 ISOTHERM INTERVAL 5oC

04-MB CHART

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04-MB CHART CONOUR 3 FEB21968 ISOTHERM INTERVAL 50

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70

5-MB CHART CONTOURIR0 MAR 61968 1-THE MINT

2-MB CHART ISOTHERM INTERVAL 5CMAR 6 1968 i

00

1 0 4-MB CHART NORITRA32QP 8 MAR 6 1I968 S01HERM hNTERVAL 5-c

I

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5-c

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MAR 131968ISTEMIERA -L

04-MB CHART ONTOUR INTERVAL 32 GoP

ISOTHERM INTERVAL 5-CMAR 131968

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MAR27HISOTHERM INTERVAL 5-0

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2-MB CHART CONTOUR INTERVAL3O GPM

MAR 271968 ISOTHERM INTERVAL C

A 11A deg

04-MB CHART INTERVAL 320 6PM

MAR271968 ISOTHERMITERWA 5C i~~ SOTHE M ASINER S

CZ

APR 31968 CONTOUR INTERVAL6 PM ISOTHERM INTERVAL 5SC

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2-MB CHART C I 5 G ISOTHERM INTERVAL 5C-APR 31968

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CONTOURINEVL0GP04-MB CHART o ISOTHERM INTERVAL60APR 31968

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APR 171968 IOTHERM INTERVAL 5shy

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2-MB CHART - -- I GPM

APR 241968 ISOTHERM INTERVAL

N

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5-MB CH T CONTOUR 6PMINTERVALo320 50CMAY 1 1968 -- - ISOTHERM INTERVAL

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2-MB CHART INTERVAL 320 GPM

SOTMER+ 500 MAY 81968 CONTOUR

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4272

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-

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AI

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JAN 24 1968 ISOTHERM INTERVAL 5-10

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FEB 71968 IEV 5O-CU

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5-MB CHART CONTOUR 32ooPINTERVFEB 211968 AWOUASM

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04MBCHA T OMTMURINTERVAL 320 GPM

FEB 211968 ISOTHERM INTERVAL 5oC

04-MB CHART

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04-MB CHART CONOUR 3 FEB21968 ISOTHERM INTERVAL 50

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5-MB CHART CONTOURIR0 MAR 61968 1-THE MINT

2-MB CHART ISOTHERM INTERVAL 5CMAR 6 1968 i

00

1 0 4-MB CHART NORITRA32QP 8 MAR 6 1I968 S01HERM hNTERVAL 5-c

I

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5-c

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2-MB CHART COTU-NERA 2 P

MAR 131968ISTEMIERA -L

04-MB CHART ONTOUR INTERVAL 32 GoP

ISOTHERM INTERVAL 5-CMAR 131968

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2-MB CHART CONTOUR INTERVAL3O GPM

MAR 271968 ISOTHERM INTERVAL C

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CZ

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2-MB CHART C I 5 G ISOTHERM INTERVAL 5C-APR 31968

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APR 171968 IOTHERM INTERVAL 5shy

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2-MB CHART - -- I GPM

APR 241968 ISOTHERM INTERVAL

N

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2-MB CHART INTERVAL 320 GPM

SOTMER+ 500 MAY 81968 CONTOUR

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-

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AI

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JAN 24 1968 ISOTHERM INTERVAL 5-10

a

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2MB CHART CONTOUR INTERVAL 5 GPM 9 JAN 24 1968 LsoTKFRM Q4oEfvlAL 5-C

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FEB 71968 IEV 5O-CU

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04-MB CHART CONTOUR INTERVAL 520

FEB 71968 ISOTHERM INTERVAL5_4tA 5A

No~ifl

5-MB CHAR o-oA oo FEB 141968 ISOTHERM INTERVAL 5C

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2-MB CHART CONUR INTERL 320 GPM

FEB 141968 -ISOTHERM INTERVAL FBqai 1

04-MB CHART

FEB 1419 68 ISTEMINTEVAL 5gC

5-MB CHART CONTOUR 32ooPINTERVFEB 211968 AWOUASM

C

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2-MB CHART CONTOUR 320 GPMINTERVALFEB 211968 ISOTKERM INTRVAL 5-C

04MBCHA T OMTMURINTERVAL 320 GPM

FEB 211968 ISOTHERM INTERVAL 5oC

04-MB CHART

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04-MB CHART CONOUR 3 FEB21968 ISOTHERM INTERVAL 50

jAlllt IUS

70

5-MB CHART CONTOURIR0 MAR 61968 1-THE MINT

2-MB CHART ISOTHERM INTERVAL 5CMAR 6 1968 i

00

1 0 4-MB CHART NORITRA32QP 8 MAR 6 1I968 S01HERM hNTERVAL 5-c

I

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5-c

MAR 131968ISTEMIERA5shy

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2-MB CHART COTU-NERA 2 P

MAR 131968ISTEMIERA -L

04-MB CHART ONTOUR INTERVAL 32 GoP

ISOTHERM INTERVAL 5-CMAR 131968

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1

09-

MAR27HISOTHERM INTERVAL 5-0

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2-MB CHART CONTOUR INTERVAL3O GPM

MAR 271968 ISOTHERM INTERVAL C

A 11A deg

04-MB CHART INTERVAL 320 6PM

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CZ

APR 31968 CONTOUR INTERVAL6 PM ISOTHERM INTERVAL 5SC

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2-MB CHART C I 5 G ISOTHERM INTERVAL 5C-APR 31968

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CONTOURINEVL0GP04-MB CHART o ISOTHERM INTERVAL60APR 31968

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APR 171968 IOTHERM INTERVAL 5shy

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CONOU ITEVA 320GPAPR 241968

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2-MB CHART - -- I GPM

APR 241968 ISOTHERM INTERVAL

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CONTOURINTERVAL 320 PM04-MB CHART __- ISOTHER NTERVAL 25- PCNORITRA

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5-B CHART iMAY81968

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ISOTHERM INTERVAL 5 C

2-MB CHART INTERVAL 320 GPM

SOTMER+ 500 MAY 81968 CONTOUR

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4272

400

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0M CHAR- CONTOUR INTERVAL320 GPM

AI

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JAN 24 1968 ISOTHERM INTERVAL 5-10

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FEB 71968 IEV 5O-CU

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04-MB CHART CONTOUR INTERVAL 520

FEB 71968 ISOTHERM INTERVAL5_4tA 5A

No~ifl

5-MB CHAR o-oA oo FEB 141968 ISOTHERM INTERVAL 5C

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2-MB CHART CONUR INTERL 320 GPM

FEB 141968 -ISOTHERM INTERVAL FBqai 1

04-MB CHART

FEB 1419 68 ISTEMINTEVAL 5gC

5-MB CHART CONTOUR 32ooPINTERVFEB 211968 AWOUASM

C

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2-MB CHART CONTOUR 320 GPMINTERVALFEB 211968 ISOTKERM INTRVAL 5-C

04MBCHA T OMTMURINTERVAL 320 GPM

FEB 211968 ISOTHERM INTERVAL 5oC

04-MB CHART

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04-MB CHART CONOUR 3 FEB21968 ISOTHERM INTERVAL 50

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70

5-MB CHART CONTOURIR0 MAR 61968 1-THE MINT

2-MB CHART ISOTHERM INTERVAL 5CMAR 6 1968 i

00

1 0 4-MB CHART NORITRA32QP 8 MAR 6 1I968 S01HERM hNTERVAL 5-c

I

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5-c

MAR 131968ISTEMIERA5shy

00

2-MB CHART COTU-NERA 2 P

MAR 131968ISTEMIERA -L

04-MB CHART ONTOUR INTERVAL 32 GoP

ISOTHERM INTERVAL 5-CMAR 131968

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1

09-

MAR27HISOTHERM INTERVAL 5-0

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2-MB CHART CONTOUR INTERVAL3O GPM

MAR 271968 ISOTHERM INTERVAL C

A 11A deg

04-MB CHART INTERVAL 320 6PM

MAR271968 ISOTHERMITERWA 5C i~~ SOTHE M ASINER S

CZ

APR 31968 CONTOUR INTERVAL6 PM ISOTHERM INTERVAL 5SC

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2-MB CHART C I 5 G ISOTHERM INTERVAL 5C-APR 31968

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CONTOURINEVL0GP04-MB CHART o ISOTHERM INTERVAL60APR 31968

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I 5-MB CHARTAPR 1011968 IsOTER INTERVAL32 p IO 114TERVAL-

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I

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2-MB CHARTAPR 1741968 -ISOTHERM INTERVAL -

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APR 171968 IOTHERM INTERVAL 5shy

C3

AJS -Z7 3STHR60TEVL0

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CONOU ITEVA 320GPAPR 241968

CT

2-MB CHART - -- I GPM

APR 241968 ISOTHERM INTERVAL

N

0 11

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CONTOURINTERVAL 320 PM04-MB CHART __- ISOTHER NTERVAL 25- PCNORITRA

IAPR241968zL

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5-MB CH T CONTOUR 6PMINTERVALo320 50CMAY 1 1968 -- - ISOTHERM INTERVAL

110U

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MAY 1I968 I IN C

0

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04-MB CHART CONTOUR INTERVAL 320 PMMAY 11968 A8ISOTERM 5CINTERVAL

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0

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5-B CHART iMAY81968

sLshy CONTOUR INERA 320GP

ISOTHERM INTERVAL 5 C

2-MB CHART INTERVAL 320 GPM

SOTMER+ 500 MAY 81968 CONTOUR

IWTRVAL 1I~~pAlCw

4272

400

-

0M CHAR- CONTOUR INTERVAL320 GPM

AI

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5-MB CHART C MAY 151968 ISOHER INTERVAL

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53

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5-MB CHART 4014TOUR INTERVAL30G

JAN 24 1968 ISOTHERM INTERVAL 5-10

a

x

2MB CHART CONTOUR INTERVAL 5 GPM 9 JAN 24 1968 LsoTKFRM Q4oEfvlAL 5-C

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04-MB CHART J3 JAN 24 1968 ISoTHNTERVAL sac

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2-MB CHART - oA 2 JAN 31 1968 --- _ deg_______L

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FEB 71968 IEV 5O-CU

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04-MB CHART CONTOUR INTERVAL 520

FEB 71968 ISOTHERM INTERVAL5_4tA 5A

No~ifl

5-MB CHAR o-oA oo FEB 141968 ISOTHERM INTERVAL 5C

bull

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2-MB CHART CONUR INTERL 320 GPM

FEB 141968 -ISOTHERM INTERVAL FBqai 1

04-MB CHART

FEB 1419 68 ISTEMINTEVAL 5gC

5-MB CHART CONTOUR 32ooPINTERVFEB 211968 AWOUASM

C

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2-MB CHART CONTOUR 320 GPMINTERVALFEB 211968 ISOTKERM INTRVAL 5-C

04MBCHA T OMTMURINTERVAL 320 GPM

FEB 211968 ISOTHERM INTERVAL 5oC

04-MB CHART

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04-MB CHART CONOUR 3 FEB21968 ISOTHERM INTERVAL 50

jAlllt IUS

70

5-MB CHART CONTOURIR0 MAR 61968 1-THE MINT

2-MB CHART ISOTHERM INTERVAL 5CMAR 6 1968 i

00

1 0 4-MB CHART NORITRA32QP 8 MAR 6 1I968 S01HERM hNTERVAL 5-c

I

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5-c

MAR 131968ISTEMIERA5shy

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2-MB CHART COTU-NERA 2 P

MAR 131968ISTEMIERA -L

04-MB CHART ONTOUR INTERVAL 32 GoP

ISOTHERM INTERVAL 5-CMAR 131968

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1

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MAR27HISOTHERM INTERVAL 5-0

CA pC

2-MB CHART CONTOUR INTERVAL3O GPM

MAR 271968 ISOTHERM INTERVAL C

A 11A deg

04-MB CHART INTERVAL 320 6PM

MAR271968 ISOTHERMITERWA 5C i~~ SOTHE M ASINER S

CZ

APR 31968 CONTOUR INTERVAL6 PM ISOTHERM INTERVAL 5SC

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2-MB CHART C I 5 G ISOTHERM INTERVAL 5C-APR 31968

OiM tMi

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CONTOURINEVL0GP04-MB CHART o ISOTHERM INTERVAL60APR 31968

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2-MB CHART COUWR NWeRVL 320GP

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I

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2-MB CHARTAPR 1741968 -ISOTHERM INTERVAL -

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APR 171968 IOTHERM INTERVAL 5shy

C3

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CONOU ITEVA 320GPAPR 241968

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2-MB CHART - -- I GPM

APR 241968 ISOTHERM INTERVAL

N

0 11

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CONTOURINTERVAL 320 PM04-MB CHART __- ISOTHER NTERVAL 25- PCNORITRA

IAPR241968zL

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5-MB CH T CONTOUR 6PMINTERVALo320 50CMAY 1 1968 -- - ISOTHERM INTERVAL

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MAY 1I968 I IN C

0

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5-B CHART iMAY81968

sLshy CONTOUR INERA 320GP

ISOTHERM INTERVAL 5 C

2-MB CHART INTERVAL 320 GPM

SOTMER+ 500 MAY 81968 CONTOUR

IWTRVAL 1I~~pAlCw

4272

400

-

0M CHAR- CONTOUR INTERVAL320 GPM

AI

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5-MB CHART C MAY 151968 ISOHER INTERVAL

ov

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53

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2-MB CHART - oA 2 JAN 31 1968 --- _ deg_______L

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N A1 i

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FEB 71968 IEV 5O-CU

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04-MB CHART CONTOUR INTERVAL 520

FEB 71968 ISOTHERM INTERVAL5_4tA 5A

No~ifl

5-MB CHAR o-oA oo FEB 141968 ISOTHERM INTERVAL 5C

bull

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2-MB CHART CONUR INTERL 320 GPM

FEB 141968 -ISOTHERM INTERVAL FBqai 1

04-MB CHART

FEB 1419 68 ISTEMINTEVAL 5gC

5-MB CHART CONTOUR 32ooPINTERVFEB 211968 AWOUASM

C

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2-MB CHART CONTOUR 320 GPMINTERVALFEB 211968 ISOTKERM INTRVAL 5-C

04MBCHA T OMTMURINTERVAL 320 GPM

FEB 211968 ISOTHERM INTERVAL 5oC

04-MB CHART

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04-MB CHART CONOUR 3 FEB21968 ISOTHERM INTERVAL 50

jAlllt IUS

70

5-MB CHART CONTOURIR0 MAR 61968 1-THE MINT

2-MB CHART ISOTHERM INTERVAL 5CMAR 6 1968 i

00

1 0 4-MB CHART NORITRA32QP 8 MAR 6 1I968 S01HERM hNTERVAL 5-c

I

iVA

5-c

MAR 131968ISTEMIERA5shy

00

2-MB CHART COTU-NERA 2 P

MAR 131968ISTEMIERA -L

04-MB CHART ONTOUR INTERVAL 32 GoP

ISOTHERM INTERVAL 5-CMAR 131968

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1

09-

MAR27HISOTHERM INTERVAL 5-0

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2-MB CHART CONTOUR INTERVAL3O GPM

MAR 271968 ISOTHERM INTERVAL C

A 11A deg

04-MB CHART INTERVAL 320 6PM

MAR271968 ISOTHERMITERWA 5C i~~ SOTHE M ASINER S

CZ

APR 31968 CONTOUR INTERVAL6 PM ISOTHERM INTERVAL 5SC

e-l

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2-MB CHART C I 5 G ISOTHERM INTERVAL 5C-APR 31968

OiM tMi

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CONTOURINEVL0GP04-MB CHART o ISOTHERM INTERVAL60APR 31968

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I

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L tF1

2-MB CHARTAPR 1741968 -ISOTHERM INTERVAL -

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04-MB CHART CONTOURINTERVAL 520 3PM

APR 171968 IOTHERM INTERVAL 5shy

C3

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CONOU ITEVA 320GPAPR 241968

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2-MB CHART - -- I GPM

APR 241968 ISOTHERM INTERVAL

N

0 11

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CONTOURINTERVAL 320 PM04-MB CHART __- ISOTHER NTERVAL 25- PCNORITRA

IAPR241968zL

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5-MB CH T CONTOUR 6PMINTERVALo320 50CMAY 1 1968 -- - ISOTHERM INTERVAL

110U

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0

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sLshy CONTOUR INERA 320GP

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2-MB CHART INTERVAL 320 GPM

SOTMER+ 500 MAY 81968 CONTOUR

IWTRVAL 1I~~pAlCw

4272

400

-

0M CHAR- CONTOUR INTERVAL320 GPM

AI

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5-MB CHART C MAY 151968 ISOHER INTERVAL

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53

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0

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JAN 31196

2-MB CHART - oA 2 JAN 31 1968 --- _ deg_______L

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NERA 2 P5-MB CHARTSOTU ISO VAL 5SCFEB 711968

N A1 i

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FEB CHART t ONTOUR INTERVAL320 PM

FEB 71968 IEV 5O-CU

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04-MB CHART CONTOUR INTERVAL 520

FEB 71968 ISOTHERM INTERVAL5_4tA 5A

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5-MB CHAR o-oA oo FEB 141968 ISOTHERM INTERVAL 5C

bull

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2-MB CHART CONUR INTERL 320 GPM

FEB 141968 -ISOTHERM INTERVAL FBqai 1

04-MB CHART

FEB 1419 68 ISTEMINTEVAL 5gC

5-MB CHART CONTOUR 32ooPINTERVFEB 211968 AWOUASM

C

Cv

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2-MB CHART CONTOUR 320 GPMINTERVALFEB 211968 ISOTKERM INTRVAL 5-C

04MBCHA T OMTMURINTERVAL 320 GPM

FEB 211968 ISOTHERM INTERVAL 5oC

04-MB CHART

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04-MB CHART CONOUR 3 FEB21968 ISOTHERM INTERVAL 50

jAlllt IUS

70

5-MB CHART CONTOURIR0 MAR 61968 1-THE MINT

2-MB CHART ISOTHERM INTERVAL 5CMAR 6 1968 i

00

1 0 4-MB CHART NORITRA32QP 8 MAR 6 1I968 S01HERM hNTERVAL 5-c

I

iVA

5-c

MAR 131968ISTEMIERA5shy

00

2-MB CHART COTU-NERA 2 P

MAR 131968ISTEMIERA -L

04-MB CHART ONTOUR INTERVAL 32 GoP

ISOTHERM INTERVAL 5-CMAR 131968

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04-MB CNART CONTOU INTERVAL 320 GPM04MB0CHART t- K ISOTHERM INTERVAL 5-CMAR 2019 68 4

1

09-

MAR27HISOTHERM INTERVAL 5-0

CA pC

2-MB CHART CONTOUR INTERVAL3O GPM

MAR 271968 ISOTHERM INTERVAL C

A 11A deg

04-MB CHART INTERVAL 320 6PM

MAR271968 ISOTHERMITERWA 5C i~~ SOTHE M ASINER S

CZ

APR 31968 CONTOUR INTERVAL6 PM ISOTHERM INTERVAL 5SC

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2-MB CHART C I 5 G ISOTHERM INTERVAL 5C-APR 31968

OiM tMi

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CONTOURINEVL0GP04-MB CHART o ISOTHERM INTERVAL60APR 31968

C

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SOTMER+ 500 MAY 81968 CONTOUR

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5-MB CHART CONTOUR 32ooPINTERVFEB 211968 AWOUASM

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04MBCHA T OMTMURINTERVAL 320 GPM

FEB 211968 ISOTHERM INTERVAL 5oC

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04-MB CHART CONOUR 3 FEB21968 ISOTHERM INTERVAL 50

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5-MB CHART CONTOURIR0 MAR 61968 1-THE MINT

2-MB CHART ISOTHERM INTERVAL 5CMAR 6 1968 i

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1 0 4-MB CHART NORITRA32QP 8 MAR 6 1I968 S01HERM hNTERVAL 5-c

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MAR 271968 ISOTHERM INTERVAL C

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2-MB CHART INTERVAL 320 GPM

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5-MB CHART CONTOUR 32ooPINTERVFEB 211968 AWOUASM

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2-MB CHART ISOTHERM INTERVAL 5CMAR 6 1968 i

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MAR 271968 ISOTHERM INTERVAL C

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5-MB CHART CONTOUR 32ooPINTERVFEB 211968 AWOUASM

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2-MB CHART ISOTHERM INTERVAL 5CMAR 6 1968 i

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MAR 271968 ISOTHERM INTERVAL C

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04MBCHA T OMTMURINTERVAL 320 GPM

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MAR 271968 ISOTHERM INTERVAL C

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5-MB CHART CONTOUR 32ooPINTERVFEB 211968 AWOUASM

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5-MB CHART OCT 91968 ISO7HERM INTERVAL5C

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2-MB CHART cTOUR INTERVAL 3-62CGPMC ONOCT 91968

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2-MB CHARTDEC 111968 ISOTHERM INTERVAL 5-C

CW5t~4l5

no

04-MB CHART oONouR INTERVAL320 GPMDEC 111969 ISOTH0rMINTERVAL 5-C

A- Mr

I

I

S 35

N K

r ronTU INTERVAL 320 GPM -~~i SOHRM INTERVAL 50C-

DECI~ 18J96

2-MB-BCHARTshy- CONTOUR 6PMINTERVAL 320

- -ISOTHERM INTERVAL -DEC 181968

I

5

~JQ

j G L

04-MB CHART DEC 181968 S INTERVAL5C

- i4S

AA

J r1- tt

5-MB CHART DEC 251968 - ISHoERM INTERVAL flC

4ZZ40 k

N N- I

coc

dD2W4oi8

DISOTHERM INTERVAL 5C2-MB CHART OOU NEVLZM DE 251968lt

10 4

I

5shy

-1

II

0 CONTOUR 6PMINTERVAL 320

ISOTHERM INTERVAL 5(DEC 251960B L0U5iS

0 6

taa

2-MB CHARTDEC 111968 ISOTHERM INTERVAL 5-C

CW5t~4l5

no

04-MB CHART oONouR INTERVAL320 GPMDEC 111969 ISOTH0rMINTERVAL 5-C

A- Mr

I

I

S 35

N K

r ronTU INTERVAL 320 GPM -~~i SOHRM INTERVAL 50C-

DECI~ 18J96

2-MB-BCHARTshy- CONTOUR 6PMINTERVAL 320

- -ISOTHERM INTERVAL -DEC 181968

I

5

~JQ

j G L

04-MB CHART DEC 181968 S INTERVAL5C

- i4S

AA

J r1- tt

5-MB CHART DEC 251968 - ISHoERM INTERVAL flC

4ZZ40 k

N N- I

coc

dD2W4oi8

DISOTHERM INTERVAL 5C2-MB CHART OOU NEVLZM DE 251968lt

10 4

I

5shy

-1

II

0 CONTOUR 6PMINTERVAL 320

ISOTHERM INTERVAL 5(DEC 251960B L0U5iS

no

04-MB CHART oONouR INTERVAL320 GPMDEC 111969 ISOTH0rMINTERVAL 5-C

A- Mr

I

I

S 35

N K

r ronTU INTERVAL 320 GPM -~~i SOHRM INTERVAL 50C-

DECI~ 18J96

2-MB-BCHARTshy- CONTOUR 6PMINTERVAL 320

- -ISOTHERM INTERVAL -DEC 181968

I

5

~JQ

j G L

04-MB CHART DEC 181968 S INTERVAL5C

- i4S

AA

J r1- tt

5-MB CHART DEC 251968 - ISHoERM INTERVAL flC

4ZZ40 k

N N- I

coc

dD2W4oi8

DISOTHERM INTERVAL 5C2-MB CHART OOU NEVLZM DE 251968lt

10 4

I

5shy

-1

II

0 CONTOUR 6PMINTERVAL 320

ISOTHERM INTERVAL 5(DEC 251960B L0U5iS

I

I

S 35

N K

r ronTU INTERVAL 320 GPM -~~i SOHRM INTERVAL 50C-

DECI~ 18J96

2-MB-BCHARTshy- CONTOUR 6PMINTERVAL 320

- -ISOTHERM INTERVAL -DEC 181968

I

5

~JQ

j G L

04-MB CHART DEC 181968 S INTERVAL5C

- i4S

AA

J r1- tt

5-MB CHART DEC 251968 - ISHoERM INTERVAL flC

4ZZ40 k

N N- I

coc

dD2W4oi8

DISOTHERM INTERVAL 5C2-MB CHART OOU NEVLZM DE 251968lt

10 4

I

5shy

-1

II

0 CONTOUR 6PMINTERVAL 320

ISOTHERM INTERVAL 5(DEC 251960B L0U5iS

2-MB-BCHARTshy- CONTOUR 6PMINTERVAL 320

- -ISOTHERM INTERVAL -DEC 181968

I

5

~JQ

j G L

04-MB CHART DEC 181968 S INTERVAL5C

- i4S

AA

J r1- tt

5-MB CHART DEC 251968 - ISHoERM INTERVAL flC

4ZZ40 k

N N- I

coc

dD2W4oi8

DISOTHERM INTERVAL 5C2-MB CHART OOU NEVLZM DE 251968lt

10 4

I

5shy

-1

II

0 CONTOUR 6PMINTERVAL 320

ISOTHERM INTERVAL 5(DEC 251960B L0U5iS

~JQ

j G L

04-MB CHART DEC 181968 S INTERVAL5C

- i4S

AA

J r1- tt

5-MB CHART DEC 251968 - ISHoERM INTERVAL flC

4ZZ40 k

N N- I

coc

dD2W4oi8

DISOTHERM INTERVAL 5C2-MB CHART OOU NEVLZM DE 251968lt

10 4

I

5shy

-1

II

0 CONTOUR 6PMINTERVAL 320

ISOTHERM INTERVAL 5(DEC 251960B L0U5iS

AA

J r1- tt

5-MB CHART DEC 251968 - ISHoERM INTERVAL flC

4ZZ40 k

N N- I

coc

dD2W4oi8

DISOTHERM INTERVAL 5C2-MB CHART OOU NEVLZM DE 251968lt

10 4

I

5shy

-1

II

0 CONTOUR 6PMINTERVAL 320

ISOTHERM INTERVAL 5(DEC 251960B L0U5iS

4ZZ40 k

N N- I

coc

dD2W4oi8

DISOTHERM INTERVAL 5C2-MB CHART OOU NEVLZM DE 251968lt

10 4

I

5shy

-1

II

0 CONTOUR 6PMINTERVAL 320

ISOTHERM INTERVAL 5(DEC 251960B L0U5iS

10 4

I

5shy

-1

II

0 CONTOUR 6PMINTERVAL 320

ISOTHERM INTERVAL 5(DEC 251960B L0U5iS