基于MODIS资料的一次南方夏季暴雨过程分析

摘要

Using conventional observation data, NCEP reanalysis data, MODIS 1B products and the cloud products with 1 km horizontal resolution, the heavy rainfall process occurred in south China from 28 June to 4 July 2009 is analyzed. The results show that the subtropical high and the northeast cold vortex, as well as the short-wave trough west of subtropical high are the mainly large scale weather systems which caused this continuous rainstorm. Vertical structure characteristics show that energy front, strong convergence zone, strong upward movement and water vapor convergence provided favorable trigger mechanism. The large value zone distributions of MODIS Channel 31 TBB, cloud liquid water path, cloud particle radius and cloud optical thickness had good consistency with the contemporaneous heavy rainfall center. Linear relation showed that MODIS Channel 31 TBB and cloud particle radius data had potential application to the quantitative monitoring and identifying of short-time hevay rainfall.%　　利用常规资料、NCEP再分析资料和水平分辨率为1 km的MODIS 1B产品、云产品,对2009年6月28日至7月4日发生在我国南方的一次持续性暴雨过程进行了分析。结果表明,副热带高压、东北冷涡以及副高西侧不断东出的短波槽是造成此次持续性暴雨过程的主要大尺度环流系统；能量锋区、强辐合带、较强的上升运动及水汽辐合为中尺度对流系统的发生发展提供了有利的触发机制；MODIS CH31 TBB、云水路径、云粒子半径和云光学厚度的大值区分布与对应时次的强降水中心分布基本一致。通过MODIS云物理参数与实况雨量的定量相关分析发现,CH31 TBB和云粒子半径在对短时强降水等强对流系统的定量监测与识别具有一定应用潜力。