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投稿时间：2011-05-18 修订日期：2011-05-30
投稿时间：2011-05-18 修订日期：2011-05-30
中文摘要: 2011年4月大气环流主要特征如下：北半球极涡呈现单极型，且偏向西半球，中高纬度地区环流呈现三波型分布，亚洲中高纬地区为一槽一脊形势。东亚大槽较常年同期偏强，西太平洋副热带高压明显偏弱，南支槽接近常年同期。2011年4月全国平均气温为11.3℃，较常年同期偏高1.0℃，西北地区大部气温明显偏高。4月全国平均降水量为21.4 mm，较常年同期偏少22.4 mm。月内共出现4次冷空气过程和4次沙尘天气过程，部分省(市、区）遭受强对流天气袭击。
中文关键词: 冷空气， 沙尘， 干旱， 强对流, 大气环流， 天气分析
Abstract:The following are the main characteristics of the general circulation of atmosphere in April 2011. There is one single center of the Northern Hemisphere polar vortex and is located in the Western Hemisphere. There are three waves around the earth in middle high latitudes and is one wave in Asia area. The East Asia deep trough is stronger, the subtropical high is obviously weaker than climatological normals and the south branch trough is approaching the climatological normals. The monthly mean temperature averaged over China is 11.3℃ which is 1.0℃ higher than climatological normals and that in Northwest China is obviously higher. The monthly mean precipitation averaged over China is 21.4 mm which is 22.4 mm less than climatological normals. There are four cold air currents and four sand dust processes in April respectively. Some provinces and regions are hit by severe convective storms.
keywords: cold air, sand dust process, drought, severe convection, atmospheric circulation, weather analysis
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基金项目:
| Author Name | Affiliation |
| ZHANG Yani | National Meteorological Centre, Beijing 100081 |
引用文本：
张亚妮,2011.2011年4月大气环流和天气分析[J].气象,37(7):906-912.
ZHANG Yani,2011.Analysis of the April 2011 Atmospheric Circulation and Weather[J].Meteor Mon,37(7):906-912.
张亚妮,2011.2011年4月大气环流和天气分析[J].气象,37(7):906-912.
ZHANG Yani,2011.Analysis of the April 2011 Atmospheric Circulation and Weather[J].Meteor Mon,37(7):906-912.