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气象:2019,45(8):1181-1188
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2019年5月大气环流和天气分析
关良,张涛
(国家气象中心,北京100081)
Analysis of the May 2019 Atmospheric Circulation and Weather
GUAN Liang,ZHANG Tao
(National Meteorological Centre, Beijing 100081)
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投稿时间:2019-06-26    修订日期:2019-07-15
中文摘要: 2019年5月大气环流呈偶极型分布,加拿大北部极涡偏强,新地岛以南极涡变化不显著,中高纬环流呈四波型,西太平洋副热带高压强度与常年相当,南支槽较常年偏弱。5月全国平均气温为16.2℃,接近常年同期,月内气温波动较大,云南平均气温达到1961年以来最高。全国降水量为69.5 mm,与常年同期相当。月内我国共出现7次区域性暴雨天气过程,北京出现罕见冰雹和雷暴大风等强对流天气,江淮、黄淮和云南等地出现中到重度干旱,北方地区有4次沙尘天气过程。
Abstract:The main characteristics of the general atmospheric circulation in May 2019 are as follows. There were two polar vortex centers in the Northern Hemisphere. The polar vortex in the north of Canada was stronger than usual and was closed to normal in the south of Novaya Zemlya. The 500 hPa geopotential height presented the distribution of a four wave pattern in the high latitude of Northern Hemisphere. The strength of Western Pacific subtropical high was similar to normal years, and the south branch though was a little weaker. The monthly mean temperature across China was 16.2℃, closed to normal. The temperature fluctuated greatly in this month, and Yunnan Province experienced the warmest mean temperature since 1961. The monthly mean precipitation amount over China was 69.5 mm, same as the normal amount (69.5 mm). In addition, seven regional torrential rain processes occurred in China this month, and the extremely severe weather like hail and thunderstorms hit Beijing. Severe droughts were found in Jianghuai, Huanghuai and Yunnan, and four sand dust events happened in the northern part of China.
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基金项目:国家重点研发计划(2017YFC1502003和2018YFC1507504)共同资助
引用文本:
关良,张涛,2019.2019年5月大气环流和天气分析[J].气象,45(8):1181-1188.
GUAN Liang,ZHANG Tao,2019.Analysis of the May 2019 Atmospheric Circulation and Weather[J].Meteor Mon,45(8):1181-1188.