2006年夏季主要天气系统及环流特征分析

简要介绍了2006年夏季的主要天气过程和形势。2006年夏季我国华南地区出现严重洪涝,淮河流域、东北大部、河套西部降雨异常偏多,而长江流域降雨偏少。6月造成华南地区强降雨的影响天气系统为切变线和地面静止锋,7、8月则为台风。2006年的梅雨期在典型梅雨常见的中高纬度乌拉尔山和鄂霍次克海阻塞高压均未建立,中高纬度高压位于贝加尔湖以西,低纬度副高位置比气候平均稍偏北。华北地区的暴雨过程多为低槽冷锋造成。东北地区多低涡活动。2006年夏季登陆我国的台风偏早、偏多、偏强,特别是4号台风“碧利斯”和8号台风“桑美”给我国造成了巨大的经济损失。与2005年相比,2006年我国西南地区的高温日数异常偏多,四川、重庆出现了特大伏旱,华北地区的高温日数偏少,但也出现了持续闷热天气,江南部分地区的高温天数也偏多,东北基本未出现高温天气。

The Weather and Its Circulation in Summer of 2006

The main weather processes and their circulations in summer 2006 are introduced.The severe flooding occurred in South China,Huaihe basin and Northeast China,however,the typical circulation and the related strong precipitation during Meiyu period over the Yangtze River basin did not appeared.The severe heavy rainfall over South China in June was caused mainly by shear line at the lower troposphere and stationary front at surface,and the heavy rainfall in July and August was produced by typhoon.In the Meiyu season of 2006,the blocking high located to the west of Baikal Lake,the west Pacific subtropical high was more northward than that in the normal year.The heavy rainfall in North China is closely related to the activities of low trough and cold front.The vortices are very active over northeastern China in the summer of 2006.The landing tropical cyclones with high intensity were more than normal and resulted in serious disasters.The heat wave days over southwest China in the summer of 2006 are much more than that in the summer of 2005,and swelter weather also occurred over North China.In addition,heat wave days did not happen over northeastern China.The heat wave occurred in southern China,which was associated with subtropical high of West Pacific and continental high,respectively.