23 December 1994 Relationship of collocated cloud radiances in the METEOSAT IR and WV channel
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Abstract
Bispectral techniques employing the infrared (IR: 10.5 - 12.5 micrometers ) and water vapor (WV: 5.7 - 7.1 micrometers ) channels of the geostationary Meteosat satellites are in use for cloud classification and cloud altitude correction of semi-transparent cirrus clouds. This paper investigates the relationship between radiance observation in the IR and WV channel and the validity of various assumptions. Specifically the following problems are addressed: (1) accuracy of coregistration of two simultaneous images in the IR and WV channel, (2) the effect of instrument noise on single pixel classification, (3) the influence of moisture above the cloud top on the satellite observed radiances and (4) the effects of different cloud emissivities in both channels. The study makes use of both radiation model calculations and satellite observations. The impact of different ice particle distributions on cloud emissivity is studied.
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Andreas Ottenbacher, Andreas Ottenbacher, Johannes Schmetz, Johannes Schmetz, } "Relationship of collocated cloud radiances in the METEOSAT IR and WV channel", Proc. SPIE 2309, Passive Infrared Remote Sensing of Clouds and the Atmosphere II, (23 December 1994); doi: 10.1117/12.196660; https://doi.org/10.1117/12.196660
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