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UP: Umweltphysik

UP 9: Atmosphäre, Aerosole, Klima - Poster

UP 9.8: Poster

Monday, March 18, 2002, 16:30–18:00, Galerie 1

An Advanced Cloud Product for the Interpretation of Tropospheric Data from GOME and SCIAMACHY — •Thomas Wagner, Chrostoph von Friedeburg, Michael Grzegorski, Mark Wenig und Ulrich Platt — Institut fuer Umweltphysik, Uni-Heidelberg, INF 229, 69120 Heidelberg

During the last years advanced algorithms for the analysis of tropospheric trace gases from satellite have been developed. In particular, it was possible to determine tropospheric column densities of BrO, NO2, HCHO, SO2, H2O, O2, and (O2)2 from observations of GOME. However, all of these data products are strongly affected by clouds, which (a) shield the atmosphere below the cloud cover and (b) show typically a larger albedo compared to the earths surface. These effects strongly limit the quantitative analysis of tropospheric trace gas products. Already existing cloud algorithms are based on spatially resolved intensity measurements and on the measurement of the O2-A-band absorption. However, both quantities show important shortcomings, especially over snow and ice surfaces. We investigate a large variety of cloud sensitive parameters measured by GOME including also the polarisation of the measured light and in particular various absorption bands of the oxygen dimer O4 (at 360, 380, 477, 577, and 630 nm) as well as the Ring effect. It turned out that several of these quantities are well suited for the characterisation of clouds even over bright surfaces. Here present first results of a GOME cloud product for polar regions.