Comparison of SCIAMACHY NRT Ozone Columns with GOME Assimilated Ozone Fields
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Comparison of SCIAMACHY NRT Ozone Columns with GOME Assimilated Ozone Fields. Henk Eskes, Jan Fokke Meirink, Ankie Piters Royal Netherlands Meteorological Institute, De Bilt. GOME ozone data assimilation. TM3DAM: • ECMWF meteo, second moment advection,

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Comparison of SCIAMACHY NRT Ozone Columns with GOME Assimilated Ozone Fields

Henk Eskes, Jan Fokke Meirink, Ankie Piters

Royal Netherlands Meteorological Institute, De Bilt


GOME ozone data assimilation Assimilated Ozone Fields

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


SCIAMACHY Validation strategy Assimilated Ozone Fields

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


OmF: SCIA vs assimilated GOME Assimilated Ozone Fields

Scia NRT

Processor 3.53

25/10 to 6/11 (GOME bias

corrected)


OmF: latitude dependence Assimilated Ozone Fields

Scia NRT

Processor 3.53

25/10 to 6/11 (GOME bias

corrected)


OmF: distribution Assimilated Ozone Fields

Scia NRT

Processor 3.53

25/10 to 6/11 (GOME bias

corrected)

SZA < 60 degree

GOME OmF,

rms=8DU,

Gaussian


Ozone: viewing-angle dependence Assimilated Ozone Fields

Scia NRT

Processor 3.53

25/10 to 6/11

0.5 sec

1 sec

0.25 sec


OmF: viewing-angle dependence Assimilated Ozone Fields

0.5 sec integr.time

Scia NRT

Processor 3.53

25/10 to 6/11

GOME bias corr.


CONCLUSIONS: Assimilated Ozone Fields

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 …


Validation support Assimilated Ozone Fields

Validation tools:

Sciamachy validation web page: www.sciamachy-validation.org

ACVT-MASI activity:

Submission of assimilation ozone profiles to NILU


www.sciamachy-validation.org Assimilated Ozone Fields


Faraday Assimilated Ozone Fields

www.sciamachy-validation.org


www.sciamachy-validation.org Assimilated Ozone Fields


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