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气象:2021,47(8):1021-1028
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2021年5月大气环流和天气分析
华珊,张涛,张宸
(国家气象中心,北京 100081;中国民用航空局空中交通管理局航空气象中心,北京 100122)
Analysis of the May 2021 Atmospheric Circulation and Weather
HUA Shan,ZHANG Tao,ZHANG Chen
(National Meteorological Center, Beijing 100081; Aviation Meteorological Center, Air Traffic Management Bureau, CAAC, Beijing 100122)
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投稿时间:2021-07-02    修订日期:2021-07-24
中文摘要: 2021年5月大气环流的主要特征是北半球极涡呈偶极型分布,强度偏强;中高纬完成了从冬季三波型向夏季四波型的转换,环流呈四波型,副热带高压较常年偏强,南海夏季风在第6候爆发。主要天气气候特征是全国平均气温为16.9℃,较常年同期偏高0.7℃;全国平均降水量为74.8 mm,较常年同期偏多8%。月内,我国共发生6次区域性暴雨天气过程。同时,多地伴随出现风雹天气,湖北武汉、江苏发生龙卷天气,造成经济损失和人员伤亡。此外,北方地区出现4次沙尘天气且影响范围广,为2002年以来同期最多;云南、四川干旱维持或发展,华南大部地区的旱情在月末得到缓解。
Abstract:The main characteristics of the general atmospheric circulation in May 2021 is that the two polar vortex centers were in the Northern Hemisphere and stronger than usual. The circulation finished the transition from a three wave pattern to a four wave pattern and the 500 hPa geopotential height presented the distribution of a four wave pattern in middle high latitudes of Northern Hemisphere. The strength of Western Pacific subtropical high was stronger than that in normal years, and the South China Sea summer monsoon erupted in the sixth pentad. The monthly mean temperature was 16.9°C, 0.7°C higher than normal. The monthly mean precipitation amount was 74.8 mm, 8% more than normal. Six regional rainfall processes occurred in China this month. Meanwhile, several provinces were attacked by gales and hailstorm, including the tornadoes seen in Wuhan, Hubei Province and also that in Jiangsu Province, which led in economic losses and casualties to same degree. In addition, four dust sand events occurred in the northern part of China, making a wide range of impacts and being the most compared with such events in the same period since 2002. The drought maintained or developed in the provinces of Yunnan and Sichuan, but the drought condition in most parts of South China got relieved at the end of May.
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基金项目:国家重点研发计划(2017YFC1502003)资助
引用文本:
华珊,张涛,张宸,2021.2021年5月大气环流和天气分析[J].气象,47(8):1021-1028.
HUA Shan,ZHANG Tao,ZHANG Chen,2021.Analysis of the May 2021 Atmospheric Circulation and Weather[J].Meteor Mon,47(8):1021-1028.