应用6.7μm水汽图像分析一次特大暴雨的大气环境特征

on Characteristic of Atmosphere Environment for a very Severe Rainstorm by Analysing GMS - 5 6.7μm Vapor Imageries

本文所采用的资料是日本GMS-5卫星每天1小时一张的6.7μm水汽图像资料和常规的探空资料、卫星图像资料等,对2000年4月14日发生的一场特大暴雨的大气环境特征进行了分析。分析指出,造成此次特大暴雨主要是由于由副高西侧南支槽和西风槽同位相叠加,造成强烈和持续的深厚水汽输送,使得MCS猛烈发展,带来强降雨。

GMS - 5 Satellite vapor images was used in this paper to analyze the vapor environment character of the severe rainstorm on July 14,2000. From the 6.7μm vapor images, we can analyze the variation of the horizontal vapor transfer before and after the rainstorm, then estimate the vertical vapor transfer. The result of studying westerly trough and southern trough showed that westerly trough in phase with the southern trough in the west to the subtropical High played a key role in southwest monsoon onset and vapor transfer, and so was it the key factor to cause the rainstorm. By Analyzing the vapor transferring section structure, we found that water was carried up to upper level by strong rising stream before the rainstorm, providing abundant water for the rainstorm. The stations near the va-nor axis in the vapor images tend to have more precipitation.