“8.26”成都区域性短时暴雨天气过程的对流指数分析  

The Convection Parameters Analysis of a Short-time Regional Heavy Rainfall in Chengdu on 26^(th) August 2009

作　　者：唐钱奎 鲁燕 黄先伦 

机构地区：[1]成都市气象局,四川成都610071 [2]四川省温江气象局,四川成都611130 [3]广东省阳江气象局,广东阳江529500

出　　处：《成都信息工程学院学报》2010年第5期518-523,共6页Journal of Chengdu University of Information Technology

摘　　要：利用常规探空资料以及MICAPS3.0系统软件计算的对流指数对2009年8月25~26日发生在成都的短时区域性暴雨过程进行分析,结果表明:稳定度指数与此次暴雨的发生、发展存在一定的关系。LI指数和IC指数在短时暴雨发生前达到最强,K指数和SI指数具有一定的超前性,在强降水发生前12小时达到最强;能量指数在暴雨发生前有一个明显的突变过程,峰值与强降水开始时刻对应;SSI指数与SHR有着一致的变化趋势,在强降水发生前也具有明显的突变性,这说明短时暴雨过程是强动力作用和强热力作用共同作用的结果。对流指数具有的这种突变性可作为预报短时暴雨的一种指标。Using the conventional sounding data and the convection index with MICAPS3.0 system,a short-time regional rainstorm which occurred in Chengdu during 25-26 August 2009 is analysed.The results show the stability index have a certain relationship with the heavy rainfall＇s occurring and development.The LI index and IC index reach the strongest values before the short-time rainstorm.The K index and SI index have a 12h ahead of the precipitation before reaching the strongest values.The energy index has a sudden change before the heavy rainfall,and the peak values correspond with the start-time of the rainstorm.The SSI index also has a sudden change before the heavy rainfall,and has a same trend with the SHR,which indicates that the short-time rainstorms are the common roles of the strong dynamic effect and the strong thermal.The mutability of the convection index may be used as a criterion of short-time rainstorms.

关 键 词：暴雨 强对流天气 短时预报 稳定度指数 能量指数 风暴强度指数 

分 类 号：P458[天文地球—大气科学及气象学]