通辽市夏季降水量及7月环流特征分析

利用通辽市境内7个气象站,1959—2008年夏季（6-8月）降水量及7月500hPa环流特征资料进行分析,结果表明：（1）通辽市夏季降水量随时间呈减少趋势,50a累计减少18.6%,目前处于少水阶段,是50a降水量最少时期;（2）降水量的多少与7月500hPa环流特征以及东亚阻塞高压、太平洋副高、亚洲纬向环流指数、青藏高压、东亚槽均有明显的关系。

Analysis of Summer Precipitation and Circulation Characteristics in July in Tong Liao city

Analyzed the data of summer precipitation and 500HPA circulation features in July collected by seven meteorological station in Tong Liao from 1959 to 2008,we can draw conclusions as follows： first,the summer precipitation has a tendency to reduce which cumulate decreased by 18.6% in 50 years.At present,it＇s a little water phase that was the least rainfall period in recent 50 years;second,the amount of precipitation was obviously related to 500HPA circulation features in July,the East Asia Blocking High,pacific subtropical high,Asia latitudinal circulation index,Tibetan high and East Asian troughs.