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COST WG2. WG2: “An assimilated Ozone and Humidity Dataset” W.A. Lahoz DARC, Reading, UK http://darc.nerc.ac.uk Thanks to Alan Geer & Mike Keil for plots. COST WG2. Aims (WG2) Participants Workplan Deliverables Timetable Examples ( assimilation/evaluation/synergy/QC-datasets ) - PowerPoint PPT Presentation
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Bern 6-7 October 2003
COST Action #723
COST WG2
WG2: “An assimilated Ozone andHumidity Dataset”
W.A. LahozDARC, Reading, UK
http://darc.nerc.ac.uk
Thanks to Alan Geer & Mike Keil for plots
Bern 6-7 October 2003
COST Action #723
COST WG2
• Aims (WG2)• Participants• Workplan• Deliverables• Timetable• Examples (assimilation/evaluation/synergy/QC-
datasets)• Future work
COST Action plan
Bern 6-7 October 2003
COST Action #723
COST WG2
AIMS (WG2):• Algorithms to assimilate UTLS datasets into
troposphere/stratosphere GCMs & CTMs
• QC-datasets of UTLS O3 & H2O for use by scientific community
• Assess state of UTLS & understand processes, using data (assimilation analyses, …)
• Information -> comprehensive analysis of anthropogenic impact on UTLS region
Bern 6-7 October 2003
COST Action #723
COST WG2
EXAMPLES
Bern 6-7 October 2003
COST Action #723
COST WG2
DARC
Bern 6-7 October 2003
COST Action #723
Self-consistency• MIPAS ozone O-A 22 –29 Sep 2002 global mean on pressure levels
• MIPAS biased high wrt analyses @ 1.6hPa
• Evidence of spin-up ~9 hPa
COST WG2
Bern 6-7 October 2003
COST Action #723
Self-consistencyMIPAS ozone O-B22 –29 Sep 2002
global mean
Gaussian curve
bias
COST WG2
Bern 6-7 October 2003
COST Action #723
COST WG2
Nadir/limb synergy (see Struthers et al. JGR 2002)
•Assimilation of MLS ozone (limb) & GOME total ozone (nadir)
•Ozone analyses using both geometries are objectively “better” (more consistent with a BLUE) than those using just one or other of the geometries
Bern 6-7 October 2003
COST Action #723
QC-dataset
Ozone analyses
at 10hPa
Sep 2002 SH
Bern 6-7 October 2003
COST Action #723
COST WG2
KNMI
Bern 6-7 October 2003
COST Action #723
COST WG2
Evaluation vsindependent dataLindenberg (52N, 14E; 19/04/00)Blue: Fortuin-Kelder climatologyGreen: OzonesondeRed: O3 profile from KNMI GOME
ozone column assimilationMagenta: O3 profile from KNMI
GOME ozone profile assimilation
Henk Eskes & Arjo Segers, KNMI
Bern 6-7 October 2003
COST Action #723
QC-dataset
GOME Total ozone assimilated 7-yr dataset:
GOA
www.knmi.nl/goa
Henk Eskes &
Arjo Segers
KNMI
Bern 6-7 October 2003
COST Action #723
A. Sci. CZ/Obs. Bordeaux
COST WG2
Bern 6-7 October 2003
COST Action #723
J. Heyrovský Institute of Physical Chemistry, Academy
of Sciences of the Czech Republic, Prague
Observatoire Aquitain des Sciences de l’Univers,
Laboratoire d’Astrodynamique, d’Astronomie et d’Aéronomie
de Bordeaux
Co-operation:
•Odin observations for analyses of H2O,O3 & other species (e.g. H2CO, CF2O,HCN,…) -> information on concentrations
•Above species are key for atmospheric photochemistry-> datasets for assimilation into photochemical models & evaluation
•Analyses complemented by lab studies of line shapes of H2O, O3 & other species
Bern 6-7 October 2003
COST Action #723
Obs. Bordeaux
COST WG2
Bern 6-7 October 2003
COST Action #723
COST WG2
N2O from ODIN/SMR
Assimilated into MSDOL
55 hPa Sep 2002 SH
Laaziz EL Amraoui &
Philippe Ricaud
Obs. Bordeaux
Bern 6-7 October 2003
COST Action #723
COST WG2
FUTURE WORK:
• Studies of Sep SH 2002 & other periods• Assimilation of H2O data (errors)• Assimilation of ODIN (ongoing), GOMOS (started),
SCIAMACHY,…• H2O QC-datasets• Radiance assimilation• Studies with data from future missions (Eos Aura,
…)
Bern 6-7 October 2003
COST Action #723
COST WG2
EXTRA MATERIAL
Bern 6-7 October 2003
COST Action #723
COST WG2
AIMS (WG2):
• Develop algorithms to assimilate an increasing variety of UTLS datasets into GCMs & CTMs that encompass troposphere & stratosphere
• Provide quality-controlled assimilated datasets of UTLS O3 & H2O for use by scientific community
• Assess state of UTLS & understand processes, using assimilated data & other data records
• Use collected information to give a comprehensive analysis of anthropogenic impact on UTLS region
Bern 6-7 October 2003
COST Action #723
COST WG2
PARTICIPANTS:
• DARC, University of Reading, UK (W. Lahoz)• KNMI, The Netherlands (P. Siegmund, H. Kelder)• U. Köln, Germany (H. Elbern)• Bordeaux Observatory, France (J. Urban, P. Ricaud)• CNR, Rome, Italy (F. Fierli)• Academy of Sciences, Czech Republic (Z. Zelinger)• Others…
Bern 6-7 October 2003
COST Action #723
COST WG2WORKPLAN:
• Algorithms to assimilate research satellite data in UTLS
• Assimilation* of L2 data (T, O3, H2O,…) into GCMs & CTMs
• Evaluation* of models & observations (assimilation,…)
• Evaluation of key parameters in UTLS
• Synergy*: limb/nadir geometries,…
• QC-datasets* (+metadata) in UTLS (T, O3, H2O)
Bern 6-7 October 2003
COST Action #723
COST WG2WORKPLAN (1):
• Algorithms to assimilate research satellite data (e.g., GOME, ODIN, Envisat) into GCMs & CTMs
• Assimilation of retrieved research satellite data (troposphere, temperature, O3, H2O, NO2, N2O, ClO) into GCMs & CTMs
• Evaluation of assimilation algorithm, model, & retrieval parameters
• Evaluation of existing & future UTLS datasets: (i) assimilation, (ii) comparison between assimilated datasets, (iii) comparison between constrained & non-constrained model datasets, and (iv) comparison with independent data
Bern 6-7 October 2003
COST Action #723
COST WG2WORKPLAN (2):
• Evaluation of key parameters in UTLS to study (i) dynamics, (ii) chemistry, & (iii) climate
• Evaluation of merit of combining limb & nadir geometries using, e.g., measurement techniques, assimilation studies
• Production of quality controlled datasets in UTLS including documentation: (i) temperature, (ii) O3, & (iii) H2O
• Assimilation of limb radiances into GCMs & CTMs
Bern 6-7 October 2003
COST Action #723
COST WG2DELIVERABLES:
• Algorithms to assimilate data into GCMs & CTMs
• Report/evaluation on UTLS assimilated datasets
• Report on UTLS: (i) dynamics, (ii) chemistry, & (iii) climate • Report on synergies: nadir/limb,…
• QC-datasets (+metadata) in UTLS (T, O3, H2O)
• Report on assimilation of limb radiances into GCMs & CTMs
Bern 6-7 October 2003
COST Action #723
COST WG2DELIVERABLES (1):
• Algorithms to assimilate research satellite into GCMs & CTMs
• Report on available UTLS assimilated datasets including evaluation of data quality, documentation & contact points
• Report on key parameters in UTLS to study (i) dynamics, (ii) chemistry, & (iii) climate
Bern 6-7 October 2003
COST Action #723
COST WG2DELIVERABLES (2):
• Report on merit of combining limb and nadir geometries using, e.g., measurement techniques, assimilation studies
• Quality controlled datasets in UTLS including documentation: (i) temperature, (ii) ozone, and (iii) water vapour
• Report on assimilation of limb radiances into GCMs and CTMs
Bern 6-7 October 2003
COST Action #723
COST WG2TIMETABLE:
• Summary progress reports for WG2 (Months 12, 24, 36, 48)
• Report of algorithms (Month 48)
• Quality –controlled datasets (Month 48)
• Preliminary studies on radiances (Month 48)
Bern 6-7 October 2003
COST Action #723
COST WG2
Unassimilateddata• MLS O3 data
• 10 hPa• 1 Feb 1997• Blue (low)• Red (high)
Bern 6-7 October 2003
COST Action #723
COST WG2
Assimilated data
• O3 analysis 12 GMT
• Met Office AC scheme• Operational data + MLS T + MLS O3
• 10 hPa• 1 Feb 1997• Blue (low)• Red (high)
Bern 6-7 October 2003
COST Action #723
COST WG2
Evaluation vsindependent data• a)-d) Ozonesonde comparisons• Line: Ozonesonde• Stars: Analyses (MLS+GOME)• Diamonds: Initial data (Fortuin+ Kelder Climatology)
Bern 6-7 October 2003
COST Action #723
COST WG2
Evaluation vsindependent data• HALOE Comparisons• 3 week average• MLS+GOME analyses• Line: O-A• Dashed line: 1 error
Bern 6-7 October 2003
COST Action #723
COST WG2
Evaluation vsindependent data• TOMS Comparison• 3 week average• MLS+GOME analyses• Line: O-A• Dashed line: 1 error
Bern 6-7 October 2003
COST Action #723
COST WG2
Nadir/limb synergy (see Struthers et al. JGR 2002)
a) MLS only, b) GOME Only, c) MLS+GOME
O-A rms: straight line (O is MLS)
MLS error: dashed line
Bern 6-7 October 2003
COST Action #723
COST WG2
Nadir/limb synergya) MLS only,b) GOME only,c) MLS+GOMEO-A rms: straight line(O is GOME)GOME error: dashed line
Bern 6-7 October 2003
COST Action #723
Participation on analyses of averaged spectra - detection and identification of very weak lines:
global averages of spectra pre-selected bandwidths
residuals for different bands: ymeas - y(x)R.T.Moliere weak + unknown
lines
H2O2, HO2 ?
special interest - the chemistry and photo-physics of FC(O)Ox radicals - a likely product of the photo-dissociation of CF2O and CFClO, in 1989
concentration estimate of CF2O 1.4 x 1014 molecule cm-3 (18 km), increase by 10 % each year
J. Heyrovský Institute of Physical Chemistry, Academy of Sciences of the
Czech Republic, Prague
Observatoire Aquitain des Sciences de l’Univers, Laboratoire
d’Astrodynamique, d’Astronomie et d’Aéronomie de Bordeaux
Starting points of cooperation between:
Bern 6-7 October 2003
COST Action #723
Laboratory
• Line shape, broadening, intensities, rate constants, branching ratios
• IR region and MW region with the help of FTIR spectrometer, IR diode lasers, MW sources
• H2CO broadening not measured yet in IR and mm region, N2O, CH3CN (+STEAM), CF2O, CH3Cl, CH3Br if appear in averaged spectra
Interpretation
• the chemistry and photophysics of FC(O)Ox radicals is not well understood part of the chemistry of the stratosphere - precursor CF2O
• HCN model deficit, role of CH3CN
• influence and reactions of CH3Cl, CH3Br, role of radicals CH2Cl, CH2Br
Bern 6-7 October 2003
COST Action #723
B: STD RH (%)
December
New Dynamics50 levels0-63 km
NMC Method
Bern 6-7 October 2003
COST Action #723
B: RH correlations, December.
New Dynamics: NMC Method
16 km 19.7 km
Bern 6-7 October 2003
COST Action #723
COST WG2
BENEFICIARIES OF COST ACTION• EO Community (end users)• Weather Agencies• Space agencies• Instrument builders• Climate Modellers• Policy makers