襄樊特大暴雨FY-3A微波资料分析

搭载在中国新一代极轨卫星FY-3A上的微波湿度计对于大气湿度以及云雨分布特征具有较好的探测能力。利用其150 GHz极化波段亮温和183.31 GHz附近的水汽吸收波段亮温及其反演产品,对2008年7月22日襄樊特大暴雨中10：00—11：00强降水成因进行了分析。结果表明：襄樊10：00—11：00强降水产生时,微波湿度计5个波段亮温均处于低值区的大梯度带;极化比、极化差出现明显的大、小值分裂;微波湿度计的高频通道资料表明,襄樊处于深对流中心地带,正是这种深厚的对流系统导致了襄樊的强降水。

An Analysis of 2008-07-22 Xiangfan Rainstorm Using FY-3A Microwave Data

Microwave hygrometer carried on the new generation of Chinese polar orbit satellite FY-3A has a preferable ability to detect the distribution characteristics of atmospheric humidity,cloud and precipitation.The torrential rain happened in Xiangfan from 10：00 to 11：00 BST 22 July 2008 is analyzed by using the data of 150 GHz polarization band bright temperature,183.31 GHz water absorption band bright temperature and the retrieval product.It is concluded that when the torrential rain took place in Xiangfan from 10：00 to 11：00 BST,the five bright temperature bands of microwave hygrometer are in high gradient of the low value region.Polarization ratio and polarization difference appear marked division on maximum and minimum value.The data of high frequency channel on microwave hygrometer indicate that Xiangfan locates in the center of deep convection which leads to the torrential rain.