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投稿时间：2012-09-20 修订日期：2012-09-28
投稿时间：2012-09-20 修订日期：2012-09-28
中文摘要: 2012年8月环流特征如下：北半球极涡呈单极型分布，中心略偏于东半球，强度较常年偏强；北半球高纬度环流呈5波型分布；西太平洋副热带高压较常年偏北偏西。2012年8月，全国平均气温为21.4℃，较常年同期（20.8℃）偏高0.6℃。全国平均降水量92.1 mm，较常年同期（105.1 mm）偏少12.4%。月内共出现8次降水过程；西北太平洋有7个热带气旋活动，有5个热带气旋登陆我国，另外，热带气旋布拉万对我国东北地区造成严重影响；江南、华南、江汉、四川盆地及新疆等地出现高温天气；19个省（市、区）遭受风雹灾害。
中文关键词: 副热带高压， 暴雨， 热带气旋， 高温
Abstract:The following are the main characteristics of the general atmospheric circulation in August 2012. There was one polar vortex center in the Northern Hemisphere and its intensity is stronger than normal. The circulation presents a five wave pattern in the middle high latitudes. In comparison with the sates of normal years, the western ridge spot of West Pacific subtropical high is further west and north. The monthly mean temperature is 21.4℃, and is 0.6℃ higher than normal (20.8℃). The monthly mean precipitation is 92.1 mm, and is 12.4% less than normal (105.1 mm).There are 8 precipitation processes, and 7 tropical cyclones have acted in the western North Pacific. There are 5 tropical cyclones landed China. Besides, tropical cyclone “Bolaven” seriously affected Northeast of China. Extreme high temperature weather occurred in areas of Jiangnan, Huanan, Jianghan, Sichuan Basin and Xinjiang. The hail storm disasters happened in 19 provinces, regions and cities in China.
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基金项目:公益性行业(气象)科研专项（GYHY201106003）资助
| Author Name | Affiliation |
| TAO Yiwei | National Meteorological Centre, Beijing 100081 |
引用文本：
陶亦为,2012.2012年8月大气环流和天气分析[J].气象,38(11):1429-1435.
TAO Yiwei,2012.Analysis of the August 2012 Atmospheric Circulation and Weather[J].Meteor Mon,38(11):1429-1435.
陶亦为,2012.2012年8月大气环流和天气分析[J].气象,38(11):1429-1435.
TAO Yiwei,2012.Analysis of the August 2012 Atmospheric Circulation and Weather[J].Meteor Mon,38(11):1429-1435.