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A cloud retrieval algorithm for SCIAMACHY
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Paper Abstract

This study is devoted to the development of a semi-analytical algorithm for the determination of the otpical thickness, the liquid water path and the effective size of droplets from spectral measurements of the intensity of solar light reflected from water clouds with large optical thickness. The algorithm is planned to be aplied to the data fromteh Scanning Imaging Absorption Spectrometer for Atmospheric Chartography, launched on March 1st, 2002 on board of the ENVIronmental SATellite. The probability of photon absorption by droplets in the visible and near-IR spectral regions is low. This allows us to simplify and modify well known asymptotic equations of the radiative transfer theory, taking into account the fact that the single scattering albedo is close to one. Modified asymptotic equations are used to develop the inverse algorithm. We also avoid the use of the Mie theory, applying parameterization and geometrical optics results with account for wave corrections. The main advantage of the method proposed lays in the fact that the equations derived not only provide a valuable alternative to the numerical radiative transfer solution. They are also much more simple than equations of a conventional asymptotic theory. This simplicity allows both the simplication of the cloud retrieval algorithm and, even more important, insight into various factors involved in cloud retrieval schemes.

Paper Details

Date Published: 3 April 2003
PDF: 12 pages
Proc. SPIE 5059, 12th International Workshop on Lidar Multiple Scattering Experiments, (3 April 2003); doi: 10.1117/12.512351
Show Author Affiliations
Alexander A. Kokhanovsky, Univ. Bremen (Germany)
B.I. Stepanov Institute of Physics (Belarus)
Wolfgang von Hoyningen-Huene, Univ. Bremen (Germany)
Vladimir V. Rozanov, Univ. Bremen (Germany)
Eleonora P. Zege, B.I. Stepanov Institute of Physics (Belarus)
Heinrich Bovensmann, Univ. Bremen (Germany)
John P. Burrows, Univ. Bremen (Germany)

Published in SPIE Proceedings Vol. 5059:
12th International Workshop on Lidar Multiple Scattering Experiments
Christian Werner; Ulrich G. Oppel; Tom Rother, Editor(s)

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