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Monitoring of near-real-time SCIAMACHY, MIPAS, and GOMOS data at ECMWF

Monitoring of near-real-time SCIAMACHY, MIPAS, and GOMOS data at ECMWF. Outline. ECMWF model Operational ozone assimilation Monitoring of Meteo products - SCIAMACHY (SCI_RV__2P) - MIPAS (MIP_NLE_2P) Summary. Author: Antje Dethof (ECMWF). The ECMWF model.

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Monitoring of near-real-time SCIAMACHY, MIPAS, and GOMOS data at ECMWF

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  1. Monitoring of near-real-time SCIAMACHY, MIPAS, and GOMOS data at ECMWF Outline • ECMWF model • Operational ozone assimilation • Monitoring of Meteo products - SCIAMACHY (SCI_RV__2P) - MIPAS (MIP_NLE_2P) • Summary Author: Antje Dethof (ECMWF)

  2. The ECMWF model • Global spectral model (u,v,T,ps,q,o3,cc,cl,ci) • Resolution: - TL511  40 km(TL159) • - 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)

  3. 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. Observations Departures (first-guess, analysis) Monitoring • 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

  5. Monitoring of SCIAMACHY Meteo data (SCI_RV__2P) Ozone • 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

  6. SCIAMACHY total column ozone: 18.-24.11.2002 SCIAMACHY GOME (KNMI)

  7. SCIAMACHY total column ozone: 18.-24.11.2002 SCIAMACHY GOME (KNMI) Unrealistically large values Observation values Fg departures 25 DU

  8. Monitoring of MIPAS Meteo data (MIP_NLE_2P) Temperature • 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

  9. T profiles – global averages 4.-10.11.02 11.-17.11.02 MIPAS ECMWF Departures MIPAS - EC Improvement after 13.11.02

  10. MIPAS Time 11.11. 17.11. Temperature (zonal means at 100 hPa): 11.-17.11.2002 More data at 100 hPa after 13.11.2002

  11. MIPAS Ozone • 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

  12. 4.-10.11.02 Ozone profiles: 0 – 20ºS 11.-17.11.02 ECMWF MIPAS Improvement after 13.11.02

  13. Ozone scatter plot (4.-10.11.02): 100-150 hPa Unrealistically large values in tropics

  14. MIPAS - Water Vapour • 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

  15. MIPAS ECMWF Water vapour profiles: 0-20ºS (11.-17.11.02) Zonal mean MIPAS (60-80 hPa) Change on 13.11.02 11.11. Time 17.11. Dry bias of ECMWF Cloud contamination of MIPAS?

  16. Summary and Outlook • 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

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