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气象:2023,49(8):1020-1028
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2023年5月大气环流和天气分析
李妮娜,林建
(国家气象中心,北京 100081)
Analysis of the May 2023 Atmospheric Circulation and Weather
LI Nina,LIN Jian
(National Meteorological Centre, Beijing 100081)
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投稿时间:2023-06-20    修订日期:2023-07-18
中文摘要: 2023年5月大气环流的主要特征是北半球极涡呈单极型分布、强度偏强,中高纬环流完成了从冬季三波型向夏季四波型的转换,副热带高压较常年同期偏强。全国平均气温为16.3℃,较常年同期偏低0.2℃;全国平均降水量为57.8 mm,较常年同期偏少18%,为1961年以来第五低。月内,我国共发生5次暴雨过程,5月第3候南海夏季风爆发后,西南地区出现降水,云南旱情得以缓解。此外,我国发生5次强对流天气过程且局地遭受冰雹灾害,北方地区出现3次沙尘天气过程。
Abstract:The main characteristics of the general atmospheric circulation in May 2023 are that the polar vortex in the Northern Hemisphere was mono-polar with stronger intensity than usual. The 500 hPa geopotential height presented the distribution of a four-wave pattern in middle-high latitudes of the Northern Hemisphere, which means that the circulation have transformed from a three-wave pattern in winter to a four-wave pattern in summer. The Western Pacific subtropical high was stronger than that of normal years. The monthly mean temperature across China was 16.3℃, 0.2℃ lower than normal. The monthly mean precipitation was 57.8 mm, 18% less than normal. During this month five torrential rainfall processes occurred in China. After the onset of the South China Sea summer monsoon in the third pentad, precipitation occurred in southwestern China, alleviating the drought in Yunnan Province. In addition, China experienced five severe convection weather events, making local areas suffer hail disasters. Besides, three sand-dust events were seen in northern China.
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基金项目:国家重点研发计划(2021YFC3000904)资助
引用文本:
李妮娜,林建,2023.2023年5月大气环流和天气分析[J].气象,49(8):1020-1028.
LI Nina,LIN Jian,2023.Analysis of the May 2023 Atmospheric Circulation and Weather[J].Meteor Mon,49(8):1020-1028.