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Proceedings Paper

A simulation study for deriving cloud liquid water path from space-borne microwave radiometric measurements
Author(s): Songtao Liu; Wei Yan
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Paper Abstract

Cloud liquid water path (L) (i.e. vertically integrated cloud liquid water) is an important parameter in meteorology and cloud physics. However the actual measurements of L are too limited to build and validate the retrieval algorithm. The space-borne microwave radiometer is the most powerful tool for monitoring the distribution and variation of L on global scale. The Advanced Microwave Scanning Radiometer on EOS (AMSR-E) is a high-powered space-borne microwave radiometer. This paper combines the physico-statistical method of Chen with the microwave radiative transfer model developed by Wentz. A linear regression relationship of L versus the difference of brightness temperature (ΔTB) between cloudy and clear atmospheres is built and a preliminary retrieval result is given. This algorithm has two advantages. Firstly it only uses the TB measurements of two channels (i.e. a retrieval channel and a low frequency channel) while the ocean algorithm needs all channels' TB measurements to retrieve L. Secondly the resolution of L can arrive at 12km while the one derived from Special Sensor Microwave/Imager (SSM/I) is 27km. This algorithm is valid for clear and cloudy skies and for light rain up to about 2 mm/h. Numerical comparative study shows that this algorithm is feasible in general although the result needs a modification.

Paper Details

Date Published: 12 May 2005
PDF: 9 pages
Proc. SPIE 5832, Optical Technologies for Atmospheric, Ocean, and Environmental Studies, (12 May 2005); doi: 10.1117/12.619736
Show Author Affiliations
Songtao Liu, PLA Univ. of Science and Technology (China)
Wei Yan, PLA Univ. of Science and Technology (China)

Published in SPIE Proceedings Vol. 5832:
Optical Technologies for Atmospheric, Ocean, and Environmental Studies
Daren Lu; Gennadii G. Matvienko, Editor(s)

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