中文摘要：

利用FY-3A/VIRR多光谱资料反演了云微物理参数,针对2009年4月18日和5月21日两个个例,选取深厚积云、高、中、低云作为分析对象,并与TERRA/MODIS反演结果进行了比较,分析了FY-3A的可靠性和稳定性。结果表明：（1）FY-3A反演的云微物理参数形成的可视化RGB合成图,色彩层次较为丰富,与TERRA RGB合成图的云外形特征基本一致,可以定性地应用于云降水特征分析。（2）与TERRA相比,FY-3A可见光反射率偏低5%,云顶平均温度偏低1~5℃,变化范围减小,4、5月个例反映的偏低程度稳定,基本可以用于定量分析。（3）FY-3A对粒子有效半径（Re）反演的问题较多,一是同一顶高Re的分布层次少,反映的粒子大小不充分;二是Re小值端偏大明显,有时甚至达8μm（5~13μm）;三是Re大值端有时偏大,有时偏小;四是5月个例比4月的偏差增大。因此,在用FY-3A反演的Re定量分析时,容易造成部分特征不明显,甚至丢失。

英文摘要：

In order to better learn and utilize the satellite source of FY-3A,the parameters of microphysical properties of cloud were retrieved with the multiple spectrum data from FY-3A VIRR and TERRA/MODIS,based on the selected different kinds of clouds including deep cumulus,clouds at upper,middle and low levels on 18 April and 21 May 2009.The reliability and stability of FY-3A satellite data were analyzed by comparison of the retrieved items from two satellite sources,which included the retrieved effective radius（Re）,temperature on the cloud top,the visualized composite RGB image using 0.6 μm reflectance（red）,3.7 μm reflectance（green） and 10.8 μm brightness temperature（blue）.The comparative results show that：（1） the rich color arrangement and change of composite BGB image using FY-3A data were similar with that using MODIS data,can be used to qualitatively analyze the cloud properties.（2） the reflectance of visible channel of FY-3A tends to 5% less than that of MODIS,the cloud top average temperature of FY-3A tends to be lower 1~5 ℃ than that of MODIS,and the scope of detectable temperature of FY-3A tends to be narrower than that of MODIS,but the extent of lower tendency is stable in the cases of April and May,which should be considered,although the retrieved values can be used,in the quantitative analysis.（3） rather larger differences have between the retrieved Re with the date from FY3A and MODIS in the following 4 aspects,the first is the narrow scopes of Re at the same height of cloud top,which suggest that the size of particles can not be fully detected or obtained,the second is the obvious tendency to be bigger in the small Re,sometimes arriving 8 μm（5 μm from MODIS and 13μm from the FY-3A）,the third is fluctuation in the large Re,and the forth is the difference of the case in May becoming larger than that of April.All results from the comparisons suggest that the accuracy,sensitivity,calibration technique and stabilization of VIRR sensor need further improve.