1. Page 1 Validation by Model Assimilation and/or Satellite Intercomparison - ESRIN 9–13 December 2002 Monitoring of near-real-time SCIAMACHY, MIPAS, and GOMOS data at ECMWF Author: Antje Dethof (ECMWF)  ECMWF model  Operational ozone assimilation  Monitoring of Meteo products - SCIAMACHY (SCI_RV__2P) - MIPAS (MIP_NLE_2P)  Summary Outline

2. Page 2 Validation by Model Assimilation and/or Satellite Intercomparison - ESRIN 9–13 December 2002  Global spectral model (u,v,T,ps,q,o3,cc,cl,ci)  Resolution: - T L 511  40 km (T L 159) - 60 levels up to 0.1 hPa (  65 km)  Comprehensive physics package  Ozone is prognostic model variable  Data assimilation system: 12-hour 4D-Var (6-hour 3D-Var) The ECMWF model

3. Page 3 Validation by Model Assimilation and/or Satellite Intercomparison - ESRIN 9–13 December 2002 Operational ozone assimilation (4D-Var) GOME (ERS2): - Total column ozone - NRT retrievals from KNMI (version FD 3.1) - approx. 20000 obs daily (14000 used) Blacklist criteria: - at solar elevations < 10° - at latitudes > 40° in NH - at latitudes < -50° in SH - QC flag > 0 SBUV/2 (NESDIS retrievals): - NOAA-16 - NOAA-14 passive - NOAA-17 passive (since 20020804,18z) - 6 ozone layers: 0.1-1 hPa, 1-2 hPa, 2-4 hPa, 4-8 hPa, 8-16 hPa, 16hPa – surface - approx. 1400 obs daily (1200 used) Blacklist criteria: - at solar elevations < 6° - QC flag > 0

4. Page 4 Validation by Model Assimilation and/or Satellite Intercomparison - ESRIN 9–13 December 2002  Passive assimilation: Data are not assimilated actively, but go through the assimilation system and statistics (e.g. first-guess departures) are calculated  Use assimilation system to evaluate data quality, biases, instrument and algorithm stability (can also show model problems)  Output statistics: - Number of data - Mean - Stdev of Monitoring Observations Departures (first-guess, analysis)

5. Page 5 Validation by Model Assimilation and/or Satellite Intercomparison - ESRIN 9–13 December 2002  Meteo products from ftp-ops.pdk.envisat.esa.int, converted into BUFR format at ECMWF  SCIAMACHY ozone data about 25 DU lower than KNMI GOME data in tropics and mid-latitudes  Unrealistically large values at high latitudes  Unrealistically low values at high southern latitudes that were seen earlier have disappeared  No geolocation information (e.g. sza, fov) in Meteo data Monitoring of SCIAMACHY Meteo data (SCI_RV__2P) Ozone

6. Page 6 Validation by Model Assimilation and/or Satellite Intercomparison - ESRIN 9–13 December 2002 SCIAMACHY total column ozone: 18.-24.11.2002 SCIAMACHYGOME (KNMI)

7. Page 7 Validation by Model Assimilation and/or Satellite Intercomparison - ESRIN 9–13 December 2002 SCIAMACHY total column ozone: 18.-24.11.2002 SCIAMACHYGOME (KNMI) Observation values Fg departures Unrealistically large values 25 DU

8. Page 8 Validation by Model Assimilation and/or Satellite Intercomparison - ESRIN 9–13 December 2002  Good agreement of MIPAS temperatures with ECMWF analyzed temperatures over large part of stratosphere (diff < 2%)  Largest differences at 0.1 hPa (ECMWF model top)  MIPAS temperatures too low at bottom end of profiles (cloud contamination ?) Upgrade on 13.11.2002, 12z:  Reduced fg-departures (MIPAS – ECMWF) below 60-80 hPa  Increased number of profiles extending below 100 hPa  Cooling above 1 hPa between 65-90S Monitoring of MIPAS Meteo data (MIP_NLE_2P) Temperature

9. Page 9 Validation by Model Assimilation and/or Satellite Intercomparison - ESRIN 9–13 December 2002 4.-10.11.0211.-17.11.02 Departures MIPAS - EC Improvement after 13.11.02 MIPAS ECMWF T profiles – global averages

10. Page 10 Validation by Model Assimilation and/or Satellite Intercomparison - ESRIN 9–13 December 2002 Temperature (zonal means at 100 hPa): 11.-17.11.2002 More data at 100 hPa after 13.11.2002 11.11.17.11. Time MIPAS

11. Page 11 Validation by Model Assimilation and/or Satellite Intercomparison - ESRIN 9–13 December 2002  Reasonable agreement with ECMWF ozone over large part of stratosphere  Some differences might be explained by known ECMWF model bias: e.g. – tropical O3 max. lower in ECMWF than MIPAS - 90-65ºN: ECMWF > MIPAS over large part of stratosphere  Unrealistically large MIPAS ozone values in lower stratosphere (cloud contamination ?) Upgrade on 13.11.2002, 12z:  Reduced departures (MIPAS – ECMWF) in lower stratosphere  Reduced number of unrealistically large MIPAS ozone values, but some large values remain MIPAS Ozone

12. Page 12 Validation by Model Assimilation and/or Satellite Intercomparison - ESRIN 9–13 December 2002 Ozone profiles: 0 – 20ºS MIPAS ECMWF Improvement after 13.11.02 11.-17.11.024.-10.11.02

13. Page 13 Validation by Model Assimilation and/or Satellite Intercomparison - ESRIN 9–13 December 2002 Ozone scatter plot (4.-10.11.02): 100-150 hPa Unrealistically large values in tropics

14. Page 14 Validation by Model Assimilation and/or Satellite Intercomparison - ESRIN 9–13 December 2002  MIPAS water vapour values generally larger than ECMWF values (sign in agreement with known dry bias of ECMWF analyses in stratosphere)  Unrealistically large MIPAS water vapour values at bottom end of profiles (cloud contamination ?) Upgrade on 13.11.2002, 12z:  Reduced MIPAS water vapour values between 20-100 hPa  Fewer unrealistically large water vapour values at bottom end of profiles, but some large values remain MIPAS - Water Vapour

15. Page 15 Validation by Model Assimilation and/or Satellite Intercomparison - ESRIN 9–13 December 2002 Water vapour profiles: 0-20ºS (11.-17.11.02) MIPAS ECMWF Dry bias of ECMWFCloud contamination of MIPAS? 11.11.17.11. Time Zonal mean MIPAS (60-80 hPa) Change on 13.11.02

16. Page 16 Validation by Model Assimilation and/or Satellite Intercomparison - ESRIN 9–13 December 2002  Monitoring of Meteo products at ECMWF  SCIAMACHY: Values ca. 10% lower than ECMWF or GOME (KNMI) over large parts of globe  MIPAS: Profile values seem reasonable, possible cloud contamination at bottom of profiles  GOMOS: Worse data quality than MIPAS. Large scatter. Water vapour values unrealistically large.  Continuation of monitoring  Experimental assimilation of ENVISAT data  Please add geolocation information to L2 products Summary and Outlook