Cloud-top pressure retrieval using the oxygen A-band in the IRS-3 MOS instrument

Authors:
R. Preusker;J. Fischer;P. Albert;R. Bennartz;L. Schüller
Affiliations:
Institut für Weltraumwissenschaften, Freie Universität Berlin, 12165 Berlin, Germany;Institut für Weltraumwissenschaften, Freie Universität Berlin, 12165 Berlin, Germany;Institut für Weltraumwissenschaften, Freie Universität Berlin, 12165 Berlin, Germany;Institut für Weltraumwissenschaften, Freie Universität Berlin, 12165 Berlin, Germany;Institut für Weltraumwissenschaften, Freie Universität Berlin, 12165 Berlin, Germany
Venue:
International Journal of Remote Sensing - CLOUDMAP: New satellite cloud products for cirrus and contrails for NWP and climate analysis
Year:
2007

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Abstract

Backscattered solar radiation as measured by MOS (Modular Optoelectronical Scanner) on the IRS3 (Indian Remote sensing Satellite 3) has been used in an algorithm to retrieve cloud top pressure. The algorithm uses a radiance ratio between absorbing channels in the Oxygen-A absorption band at 761 nm and a window channel at 750 nm. The ratios are directly related to the average photon path length, which is mainly determined by the cloud top pressure. This paper presents the principles of the retrieval scheme, results of a sensitivity study and a first validation using radiosondes.