Page 1Validation by Model Assimilation and/or Satellite Intercomparison - ESRIN 9–13 December 2002
Comparison of SCIAMACHY NRT Ozone Columns with GOME Assimilated Ozone
Fields
Henk Eskes, Jan Fokke Meirink, Ankie Piters
Royal Netherlands Meteorological Institute, De Bilt
Page 2Validation by Model Assimilation and/or Satellite Intercomparison - ESRIN 9–13 December 2002
GOME ozone data assimilation
TM3DAM:• ECMWF meteo, second moment advection, • Gas-phase + heterogeneous chemistry parametrization• Detailed forecast error modelling• KNMI GOME Fast Delivery ozone columns
Internet User Service:• 5-day ozone forecast • GOME ozone data bases
www.knmi.nl/gome_fd
Page 3Validation by Model Assimilation and/or Satellite Intercomparison - ESRIN 9–13 December 2002
SCIAMACHY Validation strategy
TM3DAM:• Monitoring of Sciamachy ozone columns• SCIA observation minus forecast• Using GOME validation results (D. Balis, J.C. Lambert)
Observation minus forecast:• Check on Gaussian statistics• Bias and standard deviation• Dependence on: * latitude, latitude-longitude maps * time * viewing angle * spatial resolution * solar zenith angle * … * cloud parameters
Page 4Validation by Model Assimilation and/or Satellite Intercomparison - ESRIN 9–13 December 2002
OmF: SCIA vs assimilated GOME
Scia NRTProcessor 3.5325/10 to 6/11 (GOME bias corrected)
Page 5Validation by Model Assimilation and/or Satellite Intercomparison - ESRIN 9–13 December 2002
OmF: latitude dependence
Scia NRTProcessor 3.5325/10 to 6/11 (GOME bias corrected)
Page 6Validation by Model Assimilation and/or Satellite Intercomparison - ESRIN 9–13 December 2002
OmF: distribution
Scia NRTProcessor 3.5325/10 to 6/11 (GOME bias corrected)SZA < 60 degree
GOME OmF, rms=8DU,Gaussian
Page 7Validation by Model Assimilation and/or Satellite Intercomparison - ESRIN 9–13 December 2002
Ozone: viewing-angle dependence
Scia NRTProcessor 3.5325/10 to 6/11
1 sec
0.25 sec
0.5 sec
Page 8Validation by Model Assimilation and/or Satellite Intercomparison - ESRIN 9–13 December 2002
OmF: viewing-angle dependence
0.5 sec integr.timeScia NRTProcessor 3.5325/10 to 6/11 GOME bias corr.
Page 9Validation by Model Assimilation and/or Satellite Intercomparison - ESRIN 9–13 December 2002
CONCLUSIONS:
SCIAMACHY NRT total ozone:• Negative bias 20-25 DU Solution: use SCIAMACHY FM ozone cross-sections• Viewing-angle dependence Solution: correct viewing angle• Still biases, especially high Solar Zenith Angles, seasonality Advice: upgrade processor to GOME GDP 3.0 Polarization, realistic cloud information• RMS (noise) very promising: comparable to / better than GOME
Validation with data assimilation - OmF differences• Good statistics, to detect subtle effects Small biases, noise statisitics, correlations, jumps in time …
Page 10Validation by Model Assimilation and/or Satellite Intercomparison - ESRIN 9–13 December 2002
Validation support
Validation tools:Sciamachy validation web page: www.sciamachy-validation.org
ACVT-MASI activity:Submission of assimilation ozone profiles to NILU
Page 11Validation by Model Assimilation and/or Satellite Intercomparison - ESRIN 9–13 December 2002
www.sciamachy-validation.org
Page 12Validation by Model Assimilation and/or Satellite Intercomparison - ESRIN 9–13 December 2002
Faraday
www.sciamachy-validation.org
Page 13Validation by Model Assimilation and/or Satellite Intercomparison - ESRIN 9–13 December 2002
www.sciamachy-validation.org
