1 / 39

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 )

malory
Télécharger la présentation

COST WG2

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  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

More Related