Meiyu rainstorms occurred in the Changjiang-Huaihe River valley in 2003 are classified into four categories according to the convective stability and precipitation property at the center of rainstorm,and the ralationships of moist potential vorticity with inertial,symmetry,and convective instabilities are analyzed.
统计了2003年发生在江淮地区的梅雨暴雨,根据暴雨中心对流稳定度及降雨性质将暴雨分为4种类型。
Diagnostic analyses are carried out for the Meiyu rainstorm in the Meiyu period from 0000UTC 20th July to 1200UTC 1st August in 1998 and the MM5V3 meso-scale model is used to simulate the Meiyu rainstorm.
对1998年7月20日00时—8月1日12时这段梅雨暴雨过程进行诊断分析,并利用MM5V3中尺度模式作梅雨暴雨的数值试验,结果表明:(1)本次梅雨暴雨分为3大段过程,非线性亚临界对称不稳定可能是3段梅雨暴雨形成的重要机制;(2)扰动风场增长与降水增长关系密切,扰动风场的增长会超前于降水的增长,非线性亚临界对称不稳定的增强可能使降水增强;(3)非线性亚临界对称不稳定主要发生在高层200hPa,中层500hPa也有发生。
It is a very important content of disaster prevention and reduction to describe and forecast the distribution of urban rainfall (rainstorm).
如何准确描述和预测降雨（暴雨）的空间分布，已成为城市减灾防灾的重要内容。