(1) Ph.D Student
(2) Associate Professor
(3) Professor
REMOTE SENSING OF CLOUD LIQUID WATER OVER LAND USING TRMM MICROWAVE IMAGER
Zhanyu Yao (1, 2), Wanbiao Li (1), Yuanjing Zhu (1), Bolin Zhao (1)
(1) Department of Atmospheric Sciences, Physics School, Peking University, Beijing 100871, P. R. China
Tel: 86-10-62751131 , Fax: 86-10-62754294
E-mail: lwb@pku.edu.cn
(2) Chinese Academy of Meteorological Sciences, Beijing 100081, P. R. China
E-mail: yaozhanyu@263.net
A technique to retrieve the cloud liquid water path (LWP) of nonprecipitating clouds over land surface using TRMM Microwave Imager (TMI) is presented. To realize this purpose, the microwave surface emissivity should be estimated first, and it is derived under cloud-free conditions from TRMM/TMI measurements and split-window infrared measurements from the Visible and Infrared Scanner (VIRS) on the TRMM.
The high sensitivity of the TMI 85.5 GHz channels to cloud liquid water allows for the estimation of LWP on the basis of microwave brightness temperature depression. Two methods for the retrieval of LWP based on the high-frequency TMI channels are developed. The 85.5 GHz single-channel retrieval method and the 85.5 GHz or 37 GHz polarization-difference retrieval method are both applied for the LWP estimations over land regions, and the retrieval results show reasonable agreement with other available data.
Intercomparisons of the two LWP retrieval methods in the GAME/HUBEX area reveal that the polarization-difference method can overcome some limitations in the single-channel method under certain situations, especially it can greatly remove the effect of surface temperature. Therefore it is more suitable to be used for the cloud LWP retrieval over land.
Submittal Information
Name :
Date :
Yao, Zhanyu
01-Jun-01-00:08:28
Organization :
Theme :
Peking University, P.R.China
Theme 4
Address :
Presentation :
Department of Atmospheric Sciences, Physics School, Peking University, Beijing 100871, P.R.China
