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投稿时间：2012-10-19 修订日期：2012-10-30
投稿时间：2012-10-19 修订日期：2012-10-30
中文摘要: 2012年9月环流特征如下：北半球高纬度地区极涡呈单极型分布，中心略偏于西半球，北半球高纬度环流呈5波型分布，槽区分别位于亚洲西部、亚洲东部、太平洋中部、北美洲东部和欧洲西部。月内，西太平洋副热带高压西脊点位置变化较大，强度比常年同期偏强。9月，全国平均气温为16.6℃，与常年同期持平，全国平均降水量73.8 mm，较常年同期(65.2 mm)偏多13.2%。月内共出现6次降水过程，西北太平洋有3个热带气旋活动，没有热带气旋在我国登陆。北方多地出现低温冷冻灾害，16个省（区）遭受风雹灾害。
中文关键词: 暴雨, 副热带高压， 切变线， 热带气旋， 低温冷害
Abstract:The following are the main characteristics of the general atmospheric circulation in September 2012. The polar center over the Northern Hemisphere is a single vortex pattern and deviated to the Western Hemisphere. The circulation presents a five wave pattern in the middle high latitudes and the trough areas are over the east part of Asia, the west part of Asia, the middle part of the Pacific, the east part of North America and the west part of Europe, respectively. The intensity of the subtropical high is slightly stronger than normal years, and its western ridge spot has large variation during September. The monthly mean temperature (16.6℃) is nearly the same as the value of normal years. The mean precipitation (73.8 mm) is 13.2% more than normal (65.2 mm). There are six precipitation processes and three tropical cyclones generated in the western North Pacific with none landed in China. In this month, freezing calamity occurred in several northern provinces of China and sixteen provinces (regions, cities) suffered from strong wind and hail disasters.
keywords: heavy rain, subtropical high, shear line, tropical cyclone, low temperature and chilly disaster
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基金项目:
| Author Name | Affiliation |
| QIAN Qifeng | National Meteorological Centre, Beijing 100081 |
引用文本：
钱奇峰,2012.2012年9月大气环流和天气分析[J].气象,38(12):1579-1584.
QIAN Qifeng,2012.Analysis of the September 2012 Atmospheric Circulation and Weather[J].Meteor Mon,38(12):1579-1584.
钱奇峰,2012.2012年9月大气环流和天气分析[J].气象,38(12):1579-1584.
QIAN Qifeng,2012.Analysis of the September 2012 Atmospheric Circulation and Weather[J].Meteor Mon,38(12):1579-1584.