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COST WG2

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 )

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COST WG2

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  1. 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 Action #723

  2. COST WG2 • Aims (WG2) • Participants • Workplan • Deliverables • Timetable • Examples (assimilation/evaluation/synergy/QC-datasets) • Future work COST Action plan COST Action #723

  3. 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 COST Action #723

  4. COST WG2 EXAMPLES COST Action #723

  5. COST WG2 DARC COST Action #723

  6. COST WG2 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 Action #723

  7. COST WG2 Self-consistency MIPAS ozone O-B 22 –29 Sep 2002 global mean Gaussian curve bias COST Action #723

  8. 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 COST Action #723

  9. QC-dataset Ozone analyses at 10hPa Sep 2002 SH COST Action #723

  10. COST WG2 KNMI COST Action #723

  11. COST WG2 Evaluation vs independent data Lindenberg (52N, 14E; 19/04/00) Blue: Fortuin-Kelder climatology Green: Ozonesonde Red: O3 profile from KNMI GOME ozone column assimilation Magenta: O3 profile from KNMI GOME ozone profile assimilation Henk Eskes & Arjo Segers, KNMI COST Action #723

  12. QC-dataset GOME Total ozone assimilated 7-yr dataset: GOA www.knmi.nl/goa Henk Eskes & Arjo Segers KNMI COST Action #723

  13. COST WG2 A. Sci. CZ/Obs. Bordeaux COST Action #723

  14. Co-operation: 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 • 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 COST Action #723

  15. COST WG2 Obs. Bordeaux COST Action #723

  16. COST WG2 N2O from ODIN/SMR Assimilated into MSDOL 55 hPa Sep 2002 SH Laaziz EL Amraoui & Philippe Ricaud Obs. Bordeaux COST Action #723

  17. 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,…) COST Action #723

  18. COST WG2 EXTRA MATERIAL COST Action #723

  19. 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 COST Action #723

  20. 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… COST Action #723

  21. COST WG2 WORKPLAN: • 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) COST Action #723

  22. COST WG2 WORKPLAN (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 COST Action #723

  23. COST WG2 WORKPLAN (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 COST Action #723

  24. COST WG2 DELIVERABLES: • 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 COST Action #723

  25. COST WG2 DELIVERABLES (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 COST Action #723

  26. COST WG2 DELIVERABLES (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 COST Action #723

  27. COST WG2 TIMETABLE: • 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) COST Action #723

  28. COST WG2 Unassimilated data • MLS O3 data • 10 hPa • 1 Feb 1997 • Blue (low) • Red (high) COST Action #723

  29. 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) COST Action #723

  30. COST WG2 Evaluation vs independent data • a)-d) Ozonesonde comparisons • Line: Ozonesonde • Stars: Analyses (MLS+GOME) • Diamonds: Initial data (Fortuin+ Kelder Climatology) COST Action #723

  31. COST WG2 Evaluation vs independent data • HALOE Comparisons • 3 week average • MLS+GOME analyses • Line: O-A • Dashed line: 1s error COST Action #723

  32. COST WG2 Evaluation vs independent data • TOMS Comparison • 3 week average • MLS+GOME analyses • Line: O-A • Dashed line: 1s error COST Action #723

  33. 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 COST Action #723

  34. COST WG2 Nadir/limb synergy a) MLS only, b) GOME only, c) MLS+GOME O-A rms: straight line (O is GOME) GOME error: dashed line COST Action #723

  35. Starting points of cooperation between: 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 deBordeaux 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 ? COST Action #723 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

  36. 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 COST Action #723

  37. B: STD RH (%) December New Dynamics 50 levels 0-63 km NMC Method COST Action #723

  38. 16 km 19.7 km B: RH correlations, December. New Dynamics: NMC Method COST Action #723

  39. COST WG2 BENEFICIARIES OF COST ACTION • EO Community (end users) • Weather Agencies • Space agencies • Instrument builders • Climate Modellers • Policy makers COST Action #723

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