广西一次强降雨TBB场特征分析

利用FY-2E卫星的相当黑体亮温（Black-Body Temperature,TBB）等经纬度投影数据（水平分辨率0.1°×0.1°）和NCEP／NCAR的再分析资料,对应分析2010年5月31日至6月2日TBB平均场分布特征及其演变特点.结果表明：TBB比较好的展示了强降雨落区及强度的变化特点,TBB的梯度变化与强降雨的演变有明显的对应关系,TBB梯度突降时,降水随之增强,突升时,降水随之减弱.丰富的水汽从南海源源不断沿副高西侧向华南上空输送,与高空槽引导下的冷空气在华南上空交汇,对广西上空的强降雨云系的发生、发展和维持起着重要作用.同时,TBB低值区在广西中部暖式切变附近稳定少动,给该地区造成长时间的强降雨天气.

TBB Feature of a Severe Heavy Rainfall in Guangxi

reanalysis data and the f mean ,TBB field distribution and rainfall cloud dissipation and heavy ~. Mesoscale Convective Complexes ）ud clusters in South China. There _~cipitation location. The rapid TBB f strong rainfall and the changes of TBB gradient had apparent correspondent relationship; the sudden decrease was followed by the strengthening of rainfall, and vice verse. When TBB decreased to the lowest, rainfall reached the strongest. The transported water vapor from the South China Sea along the west side of the subtropical high and the constant flow from Upper trough met in South China, which played an important part in the generation, development, and maintenance of the strong convective cloud cluster in Guangxi. The lower TBB band along the central Guangxi and warm shear was less dynamically stable with a small north-to- south swing, which resulted in the torrential rainfall.