ISSN 1000-0526
CN 11-2282/P
CN 11-2282/P
Archive > Volume 38 Issue 7 > 2012,38(7):890-896. DOI:10.7519/j.issn.1000-0526.2012.07.016 Prev Next
Analysis of the April 2012 Atmospheric Circulation and Weather
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Abstract:
The characteristics of general circulation of atmosphere in April 2012 are as follows. There is only one polar vortex center in the Northern Hemisphere, and the strength is similar to normal years. There are four waves around the earth in middle high latitudes and the strength of Ural blocking high is higher than the normal that leads to several streams of cold air to influence China. More south waves are at middle low latitudes and the East Asia major trough is stronger than usual at the same period. In April, the mean temperature is 11.7℃, 1.0℃ warmer than the same month of normal years (10.7℃). The average precipitation over China is 45.6 mm which is 2.5 mm more than climatological normal 43.1 mm. There are 8 rainstorm precipitation events and 6 sand dust events in April. Especially in South China and Jiangnan area many severe convection events with thunderstorm gale and hail happening.
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2012年4月大气环流特征为：北半球极涡呈单极型分布，强度接近常年；中高纬度环流呈4波型分布，乌拉尔山阻塞高压尤其偏强，有利于冷空气影响我国；中低纬度地区南支槽前多波动，西太平洋副热带高压强度稍偏强。4月全国平均温度为11.7℃，较常年同期（10.7℃）偏高1.0℃。全国平均降水量为45.6 mm，较常年同期（43.1 mm）偏多2.5 mm（偏多5.8%）。月内我国共出现了8次大到暴雨降水过程，华南、江南多强对流并伴随雷暴大风和冰雹天气，北方出现6次沙尘过程。
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