A simulation study for deriving cloud liquid water path from space-borne microwave radiometric measurements

Songtao Liu; Wei Yan

doi:10.1117/12.619736

12 May 2005 A simulation study for deriving cloud liquid water path from space-borne microwave radiometric measurements

Songtao Liu, Wei Yan

Proceedings Volume 5832, Optical Technologies for Atmospheric, Ocean, and Environmental Studies; (2005) https://doi.org/10.1117/12.619736
Event: Optical Technologies for Atmospheric, Ocean, and Environmental Studies, 2004, Beijing, China

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 (ΔT_B) between cloudy and clear atmospheres is built and a preliminary retrieval result is given. This algorithm has two advantages. Firstly it only uses the T_B measurements of two channels (i.e. a retrieval channel and a low frequency channel) while the ocean algorithm needs all channels' T_B 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.

Citation Download Citation

Songtao Liu and Wei Yan "A simulation study for deriving cloud liquid water path from space-borne microwave radiometric measurements", Proc. SPIE 5832, Optical Technologies for Atmospheric, Ocean, and Environmental Studies, (12 May 2005); https://doi.org/10.1117/12.619736

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