气象2012，Vol.38Issue(8)：1023-1028,6.
2012年5月大气环流和天气分析
Analysis of the May 2012 Atmospheric Circulation and Weather
摘要
Abstract
The following are the main characteristics of the general circulation of atmosphere in May 2012： there is only one polar vortex center in the Northern Hemisphere with stronger strength than normal years. More troughs occur in middle-high latitudes in the Asian area, and lead to several cold air currents to influence China. The subtropical high is slightly stronger than normal years. The East Asia major trough is clearly stronger than usual at the same time period. The south branch trough at 90°E is slightly stronger than normal years. The monthly mean temperature averaged over China is 16.8℃, which is 1.0℃ higher than the same period of normal years. The mean precipitation （66.1 mm） is 2.63% more than nor- mal（64.4 mm）. There are 5 precipitation processes in May 2012. Extreme precipitation events occur in Provinces Gansu and Hunan, and drought is mitigated in Yunnan. High temperature occurs in Sichuan, Yunnan, Guizhou and Guangxi. Strong wind and hail disasters hit many regions in China in May.关键词
暴雨/强对流/高温Key words
heavy rainfall/severe convection/high temperature分类
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关月..2012年5月大气环流和天气分析[J].气象,2012,38(8):1023-1028,6.
