| 2012年1月大气环流和天气分析 |
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| 引用本文： | 李勇.2012年1月大气环流和天气分析[J].气象,2012,38(4):495-500. |
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| 作者姓名： | 李勇 |
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| 作者单位： | 国家气象中心,北京,100081 |
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| 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16．8mm，较常年同期偏多3．9mm。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。
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| 关 键 词： | 冷空气 低温 持续阴雨(雪) |
| 收稿时间： | 2012/2/20 0:00:00 |
| 修稿时间： | 3/1/2012 12:00:00 AM |
Analysis of the January 2012 Atmospheric Circulation and Weather |
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| LI Yong.Analysis of the January 2012 Atmospheric Circulation and Weather[J].Meteorological Monthly,2012,38(4):495-500. |
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| Authors: | LI Yong |
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| Institution: | National Meteorological Centre, Beijing 100081 |
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| 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°C) 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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| Keywords: | cold air low temperature persistent overcast and rainy (snowy) |
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