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Sensitivity Study of the Dual-View Algorithm for Aerosol Optical Thickness Retrieval Over Snow and Ice

Larysa Istomina(1), Alexander Kokhanovsky(1), Wolfgang von Hoyningen-Huene(1), Vladimir Rozanov(1) and John Burrows(1)

(1) University of Bremen, O.Hahn Allee, 1, 28334 Bremen, Germany

Abstract

Dual-view observations provide the possibility to retrieve aerosol optical thickness (AOT) with only minor assumptions about the surface albedo. The algorithm of such retrieval over very bright surfaces – snow and ice - was established and tested. The sensitivity study was carried out using the simulated data set calculated with radiative transfer code SCIATRAN (by V.Rozanov, University of Bremen), for lambertian snow surface and for some assumed snow BRDF. The observation geometries were similar to that of double-view observation geometries of AATSR – 0° and 50°. The illumination angles were similar to Sun elevation angles during Arctic summer. During the algorithm testing we used several measured and calculated aerosol phase functions. Some preliminary results were derived for real AATSR data of several Arctic regions.

 

Keywords: ESA European Space Agency - Agence spatiale europeenne, observation de la terre, earth observation, satellite remote sensing, teledetection, geophysique, altimetrie, radar, chimique atmospherique, geophysics, altimetry, radar, atmospheric chemistry