Comparison of SCIAMACHY NRT Ozone Columns with GOME Assimilated Ozone Fields
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Transcript of Comparison of SCIAMACHY NRT Ozone Columns with GOME Assimilated Ozone Fields
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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
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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
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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
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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)
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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)
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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
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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
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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.
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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 …
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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
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Page 11Validation by Model Assimilation and/or Satellite Intercomparison - ESRIN 9–13 December 2002
www.sciamachy-validation.org
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Page 12Validation by Model Assimilation and/or Satellite Intercomparison - ESRIN 9–13 December 2002
Faraday
www.sciamachy-validation.org
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Page 13Validation by Model Assimilation and/or Satellite Intercomparison - ESRIN 9–13 December 2002
www.sciamachy-validation.org