大同市大降水的不同尺度天气系统分析  

Analysis of Different Scale Weather System of Big Precipitation in Datong

作　　者：胡润山 

机构地区：[1]山西省大同市气象局,山西大同037004

出　　处：《山西气象》2005年第3期3-4,36,共3页Shanxi Meteorological Quarterly

摘　　要：本文通过分析研究影响大同市2004年7月10日的强对流性局地强降水和2004年7月29日区域性大降水的大、中尺度系统演变及产生的天气特点,总结出影响大同市局地强降水、区域性大降水的主要大、中尺度系统,为预报提供依据。文中用“尺度分离法”将中尺度天气系统分离出来,分析这2次过程的大、中尺度天气系统。结果表明:7月10日的局地强降水是在满足强对流发生的不稳定条件和水汽条件的有利环流背景下,中尺度辐合线产生的;而7月29日的区域性大降水是在有利于形成大范围降水的大尺度环流背景下,中低层有中尺度辐合区(辐合中心)产生的。This article summarizes the main macro -scale and meso -scale system affected local strong precipitation and regional big precipitation in Datong offering the guidance for forecast by analyzing the change of macro - scale and meso - scale weather system and weather character of a strong convective local precipitation on July 10 2004 and a regional big precipitation on July 29 2004 in Datong. The paper analyze the macro - scale and meso - scale system of the two events by using ＂The scale separateing method＂ to separate the meso - scale weather system. The results show that the local strong precipitation on July 10 bringed by meso - scale convergence line in the advantageous circulation background of the instability condition and vapor condition satisfied the happening of strong convection and the regional big precipitation on July 29 bringed by middler and lower meso - scale convergence area in the macro - scale circulation background of advantageous forming the wide range precipitation.

关 键 词：大尺度系统 中尺度系统 区域性大降水 局地强降水 

分 类 号：P458.2[天文地球—大气科学及气象学]