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Remote Sensing Retrieval and Analysis of Optical Character of Cloud in Qilian Mountains

ZHANG Jie~(1), ZHANG Qiang~(1), TIAN Wen-shou~(2), HE Jin-mei~(3)(1.Key Laboratory of Arid Climatic Changing and Reducing Disaster of Gansu Province,Key Laboratory of Arid Climate Change and Disaster Reduction of CMA Institute of Arid Meteorology,China Meteorological Administration,Lanzhou Gansu 730020,China;2.Institute of Atmospheres Science,Lanzhou University,Lanzhou Gansu 730000,China;3.Lanzhou Central Meteorological Observatory,Lanzhozu Gansu 730020,China)  
By using MODIS data from Terra and Aqua satellite,6 hours precipitation data of 18 cases from 2002 to 2005,applying 6S Model and Mie Model,some parameters,including optical thickness of cloud,efficient radius of cloud particle and content of liquid water,are retrieved.Their special distributions are also analyzed by combining with GIS software.Then,the relation of all those parameters and 6 hours precipitation are analyzed.The results show that there is a striking dissimilarity in special distribution of the optics thickness and efficient radius of cloud particle,which is influenced by terrain,with a maximum on the south slopes lower than 4 300 m of the mountains,a region with rich resources of cloud water.There are positive correlation between precipitation and the three parameters.Precipitation probability is large when optical thickness changes from 8 to 20,efficient radius of cloud particle changes from 6 to 12 μm and content of liquid water is more than 0.04 g5m~(-3).Content of liquid water higher than 0.15 g5m~(-3) at 4 300 m a.s.l.shows that there is a large potential to exploit cloud water in the Qilian Mountains.
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