WG2 OVERVIEW “An assimilated Ozone and Humidity Dataset” W.A. Lahoz DARC, Reading, UK

1. WG2 OVERVIEW “An assimilated Ozone and Humidity Dataset” W.A. Lahoz DARC, Reading, UK http://darc.nerc.ac.uk Thanks to Alan Geer & Dominique Fonteyn COST Action #723

2. Topics • Aims • Participants • Workplan • Deliverables • Timetable • Research themes • Future work COST Action plan COST workshop & WG2 presentations COST Action #723

3. Aims • Algorithms to assimilate UTLS datasets into troposphere/stratosphere GCMs & CTMs • Build on theory • Retrieval/forward model algorithms -> radiance assimilation • Synergy (limb/nadir, different tools, chemistry/dynamics,…) • Apply to NWP, chemical forecasting systems • QC-datasets of UTLS O3 & H2O for use by scientific community • cal-val (e.g. Envisat,…) Use algorithms & QC-datasets -> (co-operation) -> • Assess state of UTLS & “understand” processes, using data (analyses, …) • Information -> comprehensive analysis of anthropogenic impact on UTLS region COST Action #723

4. Ozone monitoring statistics at 10hPa in DARC assimilation Cal-val: MIPAS O-B Residuals Number of accepted observations Background Observations Analysis COST Action #723 Statistics are a global mean at 10hPa

5. Gaussian errors MIPAS ozone O-B 22 –29 Sep 2002 global mean Gaussian curve bias COST Action #723

6. Synergy • 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 • -> apply to Envisat COST Action #723

7. Global map of ozone column amount 21 April 1997 12 GMT MLS ozone profile + GOME column ozone (Dobson units: red high, blue low) COST Action #723

8. Synergy of Envisat data MIPAS (limb), SCIAMACHY (limb), GOMOS (occultation) hν Envisat Limb geometry: Height resolved information Atmosphere Ozone distribution in space + time (+more species) Partition information between troposphere and stratosphere Nadir geometry: Constraint on total information Atmosphere hν SCIAMACHY (nadir) Envisat COST Action #723

9. Filling in gaps in knowledge The SH polar vortex split of Sep 2002 MIPAS ozone DARC analyses Courtesy Alan Geer Blue: low ozone; Red: high ozone; 10 hPa COST Action #723

10. Synergy: different tools O3 evolution 31.5hPa;22 Sep -> 25 Sep 2002ACRI GOMOS analysesRed (high), blue (low) COST Action #723

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

12. Synergy: different tools & unobserved species 24 Sep 2002 12UTC: Ozone photochemistry BIRA-IASB MIPAS analyses: red (high), blue (low) Ozone 475K ClOx = ClO+2*Cl2O2 475K unobserved COST Action #723

13. Algorithms Courtesy KNMI GOME Better agreement with profile assimilation Assimilated and measured ozone profiles over Lerwick COST Action #723

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

15. Co-operation • ASSET partners (NWP systems, sophisticated photochemical models, retrievals, data dissemination) -> links with theory & instrument teams • Lab studies / atmospheric photochemistry (J. Heyrovský, IPC, Ac. Sciences Czech Rep., Prague & Obs. Aquitain des Sciences de l’Univers, Lab. d’Astrodynamique, d’Astronomie et d’Aéronomie, Bordeaux) • More… COST action a basis for co-operation: meetings, workshops, visits, summer schools,… COST Action #723

16. Future • Studies of Sep SH 2002 & other periods (e.g. for cal-val of Envisat data) • Assimilation of MIPAS &ODIN (ongoing), GOMOS (started), SCIAMACHY,… • H2O QC-datasets • Radiance assimilation • Studies with data from future missions (Eos Aura,…) -> Co-operation between all actors: instrument teams, theory, NWP, modellers, DA, EO… Encourage groups to use Short-Term Scientific Mission (STSM) funds for visits -> Basis to consolidate group members & workplan COST Action #723

17. Material for WG2 discussion on Friday COST Action #723

18. Group members • 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 (ASSET partners & associates,…) COST Action #723

19. Workplan • Algorithms to assimilate research satellite data in UTLS (retrievals/forward models; radiance assimilation) • 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, chemistry/dynamics,… • QC-datasets (+metadata) in UTLS (T, O3, H2O) • Deliverables (algorithms, QC-datasets, reports,…) COST Action #723

20. 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

21. 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