一次短时暴雨的中尺度系统活动及其结构特征分析

利用区域自动站雨量资料、FY-2E卫星资料、NCEP再分析资料，分析了2010年5月6日凌晨出现在湖南娄底的一次中尺度对流系统（MCS）的演变特征及中尺度系统的结构特征。结果表明，MCS是强降水产生和发展的重要影响系统；卫星反演的相当黑体亮温（TBB）场能较直观地反映暴雨过程中积云对流活动、降水的分布和强度特征，TBB低值带与暴雨落区有很好的对应关系；通过Barnes带通滤波后的扰动流场和高度场表现暴雨区附近存在较明显的高层反气旋环流和低层气旋环流；高层辐散、低层辐合，加强了MCS的发生、发展；此外扰动温度场揭示了强对流性天气发生发展所需能量的主要来源：

Analysis of the Mesoscale System Activity and Structure Characteristics of A Short Rainstorm

Based on the automatic station rainfall data,FY-2E satellite image data,NCEP reanalysis data,a mesoscale convective system (MCS) evolution features and structural characteristics on May 6th 2010 in Loudi City of Hunan Province were analyzed. The results showed that,MCS is a major influence system for strong precipitation of the emergence and development; brightness temperature (TBB) field of satellite inversion can more directly reflect the process of cumulus convective rainfall events,rainfall distribution and intensity of features,the heavy rain area is basically in the lower TBB band. There is a more obvious level anticyclonic circulation and cyclonic circulation in the disturbance flow field and high field near the performance of heavy rain by Barnes band-pass filter; divergence of upper level and convergence of low-level enhanced MCS occurrence and development; In addition,the temperature field disturbance revealed the main source of energy which strong convective weather development is needed for.