| 2012年2月大气环流和天气分析 |
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| 引用本文： | 董全.2012年2月大气环流和天气分析[J].气象,2012,38(5):635-640. |
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| 作者姓名： | 董全 |
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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2月大气环流特征为：北半球极涡呈双极型,中心分别位于加拿大东北部和鄂霍茨克海附近,后者强度较常年平均明显偏强;中高纬环流呈经向型,乌拉尔山附近维持阻塞高压活动,强度偏强;平均南支槽位于90°E附近,接近多年平均位置,强度偏弱。2012年2月全国平均气温-3.2℃,较1月-7.2℃明显回暖,但比常年同期（-2.0℃）偏低1.2℃。全国平均降水量为14.5 mm,较1月16.8 mm减少2.3 mm,较常年同期（17.6mm）偏少3.1 mm。月内出现三次全国范围的中等以上强度冷空气过程,以及三次降水过程。西藏南部出现极端降水事件,云南和四川西南部的气象干旱发展,南方大部继续低温阴雨寡照天气。
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| 关 键 词： | 冷空气 干旱 持续阴雨 |
| 收稿时间： | 2012/3/16 0:00:00 |
| 修稿时间： | 2012/3/25 0:00:00 |
Analysis of the February 2012 Atmospheric Circulation and Weather |
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| DONG Quan.Analysis of the February 2012 Atmospheric Circulation and Weather[J].Meteorological Monthly,2012,38(5):635-640. |
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| Authors: | DONG Quan |
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| Institution: | National Meteorological Centre, Beijing 100081 |
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| Abstract: | The characteristics of general circulation of atmosphere in February 2012 are as follows.There were two polar vortex centers in the Northern Hemisphere,which were located at the northeast of Canada and sea of Okhotsk, respectively.The latter has strengthened compared to the mean conditions.The circulation presented meridional patterns at the middle and high latitudes.There were active blocking anticyclones near the Ural Mountains persistently and their strength was higher than the normal.The average south branch trough was located at 90°E nearly,at the general average position,but stronger than the mean conditions.In February,the mean temperature is -3.2℃,warmer than that in January(-7.2℃),but colder than the same month of normal years(-2.0℃). The average precipitation all the country is 14.5 mm,less than that in January(16.8 mm),and less than the same month of normal years(17.6 mm).There were three cold air events affecting most of the country,and three precipitation processes in this month.There were extreme precipitation events happening at south of the Tibet.In Yunnan Province and southwest of Sichuan Province,the meteorological drought was developing.The cold,rainy (snowy),and less sunshine weathers were continuing in southern China. |
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| Keywords: | cold air drought persisting overcast and rainy (snowy) |
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