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投稿时间：2012-02-20 修订日期：2012-03-01
投稿时间：2012-02-20 修订日期：2012-03-01
中文摘要: 2012年1月大气环流及我国天气主要特征如下：北半球高纬度地区极涡呈偶极型，位于加拿大北部的中心偏强，亚洲东北部地区的中心偏弱，中高纬度地区环流呈现经向型，东亚大槽偏强，平均南支槽位于80°E附近，强度偏强。2012年1月全国平均气温为-7.2℃，较常年同期偏低1.7℃。全国平均降水量为16.8 mm，较常年同期偏多3.9 mm。月内出现两次中等以上强度的冷空气过程以及4次降水过程，新疆、内蒙古等地出现极端低温事件，南方出现大范围持续低温阴雨（雪）天气。
中文关键词: 冷空气， 低温， 持续阴雨（雪）
Abstract:The following are the main characteristics of the general circulation of atmosphere and weather over China in January 2012. There were two polar vortex centers in the Northern Hemisphere, which were respectively located to the north in Canada and the east northeast in Asia. The circulation presents meridional patterns in middle high latitudes. The East Asia major trough is stronger than the trough in average condition, and the average south branch trough is located at 80°E nearby and stronger than the normal years. The average temperature (-7.2℃) is 1.7℃ lower than and the average precipitation(16.8 mm) is 3.9 mm more than the same period of normal years in January 2012. There were two clod air processes and four rainfall processes in the month. The extreme low temperature event occurred in Xinjiang and Inner Mongolia, etc. A large scale persisting overcast and rainy (snowy) weather happened in the southern China.
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基金项目:
| Author Name | Affiliation |
| LI Yong | National Meteorological Centre, Beijing 100081 |
引用文本：
李勇,2012.2012年1月大气环流和天气分析[J].气象,38(4):495-500.
LI Yong,2012.Analysis of the January 2012 Atmospheric Circulation and Weather[J].Meteor Mon,38(4):495-500.
李勇,2012.2012年1月大气环流和天气分析[J].气象,38(4):495-500.
LI Yong,2012.Analysis of the January 2012 Atmospheric Circulation and Weather[J].Meteor Mon,38(4):495-500.