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| Titel |
Retrieval of cloud height from SCIAMACHY using oxygen absorption around 630nm |
| VerfasserIn |
Michael Grzegorski, Tim Deutschmann, Ulrich Platt, Ping Wang, Thomas Wagner |
| Konferenz |
EGU General Assembly 2010
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| Medientyp |
Artikel
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| Sprache |
Englisch
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| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 12 (2010) |
| Datensatznummer |
250043673
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| Zusammenfassung |
| The SCanning Imaging Absorption spectrometer for Atmospheric ChartographY
(SCIAMACHY) on ENVISAT allows measurements of different atmospheric trace gases
(e.g. O3, NO2, SO2, CH4, HCHO, CO, BrO, H2O, O2, O4) using the DOAS
technique. The HICRU algorithm retrieves cloud height using the spectral analysis of the
oxygen absorption around 630nm combined with results of the Monte-Carlo model
TRACY-II and a new SCIAMACHY surface albedo database. The results are compared
to:
1.) cloud height retrievals of other satellite instruments (MERIS, MODIS)
2.) ISCCP climatology
3.) SCIAMACHY cloud algorithms (SACURA, FRESCO+)
4.) LIDAR/RADAR measurements.
For low clouds, the HICRU algorithm retrieves cloud heights more close to the
the top, because of the assumption of an appropriate cloud model with a realistic
estimation of the scattering inside the cloud. It is also demonstrated, that none the
three SCIAMACHY cloud algorithms HICRU, SACURA and FRESCO+ is able to
retrieve the top of high clouds because of principal characteristics of the retrieval
methods based on oxygen absorption. But oxygen absorptions can provide important
additional information on the vertical cloud structure and multiple cloud layers if
the method is combined with cloud-top-retrieval using windows in the thermal
infrared. An application of these concepts to the GOSAT instrument will be discussed. |
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