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气象:2015,41(7):915-920
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2015年4月大气环流和天气分析
(国家气象中心,北京 100081)
Analysis of the April 2015 Atmosphere Circulation and Weather
(National Meteorological Centre, Beijing 100081)
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投稿时间:2015-05-24    修订日期:2015-06-10
中文摘要: 2015年4月环流特征如下:极涡为偶极型环流,极涡主体位于格陵兰西侧与加拿大之间,另一中心位于亚洲的东北部;两个极涡中心较常年平均偏低4~8 dagpm,乌拉尔山高压脊偏高8~12 dagpm;副热带高压面积偏大、西脊点偏西,南支槽位置与强度接近常年平均;4月全国平均气温11.6℃,较常年同期(11℃)偏高0.6℃;全国平均降水量43 mm,接近常年同期(44.7 mm),我国中东部长江以北地区降水偏多,江南、华南降水偏少。4月全国强对流天气过程频发,1—4、19—20和28—29日出现了范围较大的强对流天气。北方地区出现2次沙尘天气。
Abstract:The main characteristics of the general atmospheric circulation in April 2015 were as follows. The circulation of polar vortex in the Northern Hemisphere was in a dipole type, with one center located between the west of Greenland and Canada, and the other in the northeast of Asian. The strength of both centers was 4-8 dagpm lower than normal years, but the Ural Mountain ridge was 8-12 dagpm higher than normal. The Northwest Pacific subtropical high extended to west more than usual with larger area. The location and strength of south branch trough was close to normal annual means. The monthly mean temperature was 11.6℃, being 0.6℃ higher than normal. The monthly mean precipitation was 43 mm, which is close to the annual average (44.7 mm). While the precipitation in the region to the north of Yangtze River was more than average, the situation in South China was opposite. Severe convective weather events occurred frequently in April, with large scope of hail, thunderstorm and gust seen in 1-4, 19-20, and 28-29. Two sandstorms happened in the northern part of China.
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周康辉,方翀,2015.2015年4月大气环流和天气分析[J].气象,41(7):915-920.
ZHOU Kanghui,FANG Chong,2015.Analysis of the April 2015 Atmosphere Circulation and Weather[J].Meteor Mon,41(7):915-920.