WMO Cloud Modelling Workshop, Hamburg, 12. Juli 2004 The BALTEX BRIDGE Campaign (BBC) cases Susanne Crewell, Nicole van Lipzig, Wenchieh Yen Meteorological

WMO Cloud Modelling Workshop, Hamburg, 12. Juli 2004

The BALTEX BRIDGE Campaign (BBC) cases

Susanne Crewell, Nicole van Lipzig, Wenchieh Yen

Meteorological Institute Munich


Contributions

Felix Ament, University of BonnLokal-Modell (LM) of DWD, x =1.1 to 7 km

- horizontal resolution, - different cloud schemes

Ulrika Willén, SMHIRCA, x = 18 km

- vertical resolution (24, 40, 60 layers)

Erik van Meijgaard, KNMIRACMO, x = 18 km

- different physic packages

Jean-Pierre Charboreau, Laboratoire Aerologique, Méso-NH, x = 2.5 km


BALTEX BRIDGE Campaign (BBC)

Crewell, S., et al, The BALTEX Bridge Campaign: An integrated approach for a better understanding of clouds, Bull. Amer. Meteor. Soc. , in press.


23 September 2001

0 UTC, 23 Sep 01 0 UTC, 24 Sep 01

Geopotentialheight [gpm]at 500 hPa

IWV [kg m-2]

sea levelpressure

wind at850 hPa

Cabauw

.


23 September 2001

Cabauw

Radiosoundings, μ- & IR radiometer, lidarsuper site

MODIS 10:40 UTC


23 September 2001: aircraft

CASI observations by FU Berlin, Radiances at 753 nm

10 km

1.4 km


23 September 2001: LWC

Satellite retrieval from KNMI


23 September 2001

Cloud radar - refectivity- velocity- LDRLWPLidarRadiosonde

20 30 40 50 60 70 80 90 100R elative Hum id ity [% ]

0

500

1000

1500

2000

2500

3000

He

igh

t [m

] 8 :58 U TC10:01 U TC10:59 U TC13:28 U TC14:43 U TC15:37 U TC

284 286 288 290 292 294 296 298Poten tia l tem pera tu re [K ]

0

500

1000

1500

2000

2500

3000

Hei

ght

[m]

8 :58 U TC10:01 U TC10:59 U TC13:28 U TC14:43 U TC15:37 U TC


23 September 2001: cloud radar

9 9.1 9.2 9.3 9.4 9.5 9.6 9.7 9.8 9.9

T im e [U TC ]

0.2

0.4

0.6

0.8

1.0

1.2

He

ight

[km

]

-55

-50

-45

-40

-35

-30

-25

Reflectiv ity [dBZe] 23.09.2001

9 9.1 9.2 9.3 9.4 9.5 9.6 9.7 9.8 9.9

T im e [U TC ]

0.2

0.4

0.6

0.8

1.0

1.2

Hei

ght

[km

]

- 2

- 1 . 5

- 1

- 0 . 5

0

0 . 5

1

1 . 5

2

Velocity [m /s] 23.09.2001

Markus Quante, GKSS

9.46 9.48 9.5 9.52 9.54 9.56 9.58 9.6 9.62T im e [UT C]

0

0.2

0.4

0.6

0.8

1

LW

C [

gm-3

] PVM 100ANevzorov probeFSSP-ER

Leg 5, 23.09.2001, 584 m



Löhnert, U., S. Crewell, C. Simmer, 2004: An integrated approach towards retrieving physically consistent profiles

of temperature, humidity, and cloud liquid water, J. Appl. Met.,



7:58 to 9:57 UTC

mean LWCadiabatic 90 % percentile aircraft meas. in the vicinity of the measurement site (< 5 km)

LWPIPT= 64 g m-2

LWPadiab= 100 g m-2


23 September 2001: aircraft

Aircraft observations by Merlin, Partenavia, Cessna

1 10 100 1000 10000diam eter [m ]

1E-6

1E-5

1E-4

1E-3

1E-2

1E-1

1E+0

1E+1

1E+2

1E+3

1E+4

1E+5

dN/d

D [

l-1

m-1

]

FSSP-ER2D -C2D -P

EC AV, 02.04.03, fligh t section 7, 954 m

GKSS

particle volume monitor

liquid water content (LWC) of drops with diameter<40 μm; PVM-100A3, 14, p, m, b

LWC, effective radius (reff)

Nevzorov Probe5,

liquid and total (liquid plus ice) water content (TWC)

LWC, TWC

FSSP sizing of single droplets with diameter < 40 μm; FSSP-100 5, m FSSP-100-ER 5, m Fast-FSSP 3,

14, p, m

droplet size distribution (DSD)

optical array probes

droplets with diameter between 25 and 800 μm with OAP-2D2-C5, p, m OAP-2D2-P5, m

DSD

aerosol sensors

aerosol concentration for particles > 0.01 µm with CPC-3010 14, p,m ; PCASP-X 14, p

particle concentration and size distribution

albedometer14,p

1024 channels between 290 an 1000 nm; active horizontal stabilization

spectral irradiances ↓↑

imager radiances between 450 and 1000 nm by casi19, c

spectrally resolved images


Model comparisonCloud cover at Cabauw

RACMO with 24 layersand ECHAM4 Physics

RACMO with 40 layersand ECMWF physics

Ulrika Willen



Ulrika Willen


Model comparison: Cabauw site

LWC

RACMO (ECHAM4) RACMO (ECMWF) LM

RCA Méso-NH


LM and Precipitation

Cabauw

Precipitation [mm/h]

Fre

quen

cy o

f oc

cure

nce

[%]

0 0-0.1 0.1 -1 > 1

LWP, 23 September 12 UTC

Black contours show edgesof precipitation areas


21 May 2003

0 UTC, 23 Sep 01 0 UTC, 24 Sep 01

Geopotentialheight [gpm]at 500 hPa

IWV [kg m-2]

sea levelpressure

wind at850 hPa

Cabauw


21 May 2003


21 May 2003

Cabauw

Marc Schröder

LM, LWP 11 UTC0.3, 0.6, 0.9 kg m-2

over land

MODIS, 10:01 UTC


LM LWC domain average11 UTC, Top 2700 m

5:15 8:30 11:20 14:17

wind speed wind direction temperature

virt. pot. temp. spec. humidity rel. humidity (+ice sat)


21 May 2003


21 May 2003

ACTOS systemHolger Siebert IfT Leipzig


21 May 2003


21 May 2003





different vertical resolutionsfor RCA model

Ulrika Willen


Conclusions

two well documented cases (stratiform – convective) from BALTEXBRIDGE Campaigns

all observations (also for all other CLIWA-NET days) are available on request and soon using anonymous ftp at bbc.knmi.nlcliwa_dvd

all models seem to represent synoptic situation well

for stratiform case Meso-NH reproduces low level stratus cloud best

for convective case statistical analysis has to be made

Lokal-Modell has problems with contiguous clouds and the production ofslight precipitation


23 September 2001: Wind400

200

0

10

5

0


23 September 2001

low-pressure system, still pronouncedly present in the upper air, moved to Denmark on the 21st, but it crossed the Netherlands again on the 23rd. 21-22 Sep: cloudy with (from time to time heavy) showers. 23 Sep: low-level clouds in the morning transferring into shallow cumulus in the early afternoon.

MODIS 10:40

Documents

WMO Cloud Modelling Workshop, Hamburg, 12. Juli 2004 The BALTEX BRIDGE Campaign (BBC) cases Susanne Crewell, Nicole van Lipzig, Wenchieh Yen Meteorological