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Hannover 2010 – wissenschaftliches Programm

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UP: Fachverband Umweltphysik

UP 3: Greenhouse Gases and Climate

UP 3.3: Vortrag

Mittwoch, 10. März 2010, 11:45–12:00, M 11

Retrieval of atmospheric CO2 from SCIAMACHY nadir spectra considering scattering at thin ice clouds and aerosol — •Maximilian Reuter, Michael Buchwitz, Jens Heymann, Oliver Schneising, Heinrich Bovensmann, and John Burrows — Institut für Umweltphysik, Universität Bremen

The CO2 mixing ratio (XCO2) can be derived from SCIAMACHY by simultaneously retrieving the atmospheric column of CO2 and O2. Therefore, simulated sun normalized radiance spectra of the O2-A absorption band at around 760nm and of the CO2 absorption band at 1580nm can be fitted to corresponding measured radiances. Unfortunately, both bands have a relatively large spectral distance and show also large differences of the strength of absorption. For this reason, path length modifications due to scattering by aerosols and clouds in both bands are not identical, resulting in possible retrieval errors of XCO2. Sub-visible cirrus clouds with an optical depth of 0.03 can already significantly affect the retrieval. SCIAMACHY measurements within the CO2 band do not hold enough information to correct for this effect. However, valuable information about cirrus clouds can potentially be obtained from SCIAMACHY measurements in the O2-A band. Therefore, an optimal estimation based retrieval scheme has been developed accounting for cirrus clouds by transferring cirrus information obtained from the O2-A band to the CO2 band. We will present early results of the enhanced retrieval scheme applied to SCIAMACHY measurements in the surrounding of two sites: Park Falls, USA and Darwin, Australia.

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