1 / 16

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.

jenn
Télécharger la présentation

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

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. 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

More Related