2008年朝阳地区一次局地大暴雨天气特征分析

Analysis on the Weather Characteristics of Regional Heavy Rainstorm in Chaoyang in 2008

利用气象常规资料,从环流形势、物理量场特征、雷达回波特征等方面出发,对2008年7月14日夜间到15日白天喀左县、凌源市、朝阳县南部地区出现的暴雨、大暴雨天气过程进行了分析总结,得出产生此次局地暴雨的主要原因:源源不断的水汽、强盛而持久的气流上升运动和大气层结不稳定是产生此次局地暴雨的主要物理条件;稳定的大气环流背景,较强冷空气和江淮气旋共同影响的结果;江淮气旋是朝阳地区产生暴雨的典型系统。

By using the conventional meteorological data, from the perspectives of circulation pattern, physical quantity field characteristic and radar echo feature, the weather processes of rainstorm and heavy rainstorm appearing in Kazuo County, Lingyuan City and southern Chaoy- ang County on July 14 - 15, 2008 were analyzed, and the main cause of regional rainstorm was found, while enough water vapor, strong and persistent ascending motion of currents and unstable atmospheric stratification were the primary physical conditions of regional rainstorm. In ad- dition, the rainstorm was affected by stable atmospheric circulation, strong cold air and Changjiang-Huaihe cyclone, and Changjiang-Huaihe cyclone was the typical system of the rainstorm in Changyang.