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气象:2021,47(9):1162-1168
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2021年6月大气环流和天气分析
解晋,周宁芳
(国家气象中心,北京 100081)
Analysis of the June 2021 Atmospheric Circulation and Weather
XIE Jin,ZHOU Ningfang
(National Meteorological Centre, Beijing 100081)
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投稿时间:2021-07-28    修订日期:2021-08-02
中文摘要: 2021年6月北半球的大气环流主要特征表现为,极涡呈单极型分布,较常年同期偏强;欧洲上空500 hPa位势高度场较常年同期显著偏高,西太平洋副热带高压位置南北变化较大。6月全国平均降水量91.5 mm,较历史常年同期偏少8%,江南大部、华南北部、江淮地区较常年偏少2~5成,局部地区偏少5成以上;内蒙古北部、黑龙江西部地区以及吉林东部、辽宁中东部偏多5成以上。全国平均气温20.8℃,较历史同期略偏高,其中河南北部、江苏中部以及青海南部地区气温较常年同期偏高达到了2℃以上。本月内有8次区域性暴雨天气过程,极端降水量出现区域分散。6月共有2个台风生成,接近历史同期水平,没有台风登陆我国。6月我国黄淮西部、江淮东部以及华南南部等地共44个站发生极端高温事件,4个站日最高气温突破历史同期极值。
Abstract:The main characteristics of the general atmospheric circulation in June 2021 are as follows. There was one polar vortex center with stronger strength than normal in the Northern Hemisphere. The 500 hPa geopotential height over Europe was stronger than normal. The western Pacific subtropical high moved northward during middle dekads of this month and then southward in the last dekad. In June, the monthly mean precipitation of China was 91.5 mm, which was less than the normal by 8%. The negative precipitation anomaly reached 20%-50% in most part of Jiangnan, north part of South China and Jianghuai Region. In some regions the negative anomaly exceeded 50%. However, the positive precipitation anomaly reached more than 50% in northern Inner Mongolia, western Heilongjiang Province and eastern Jilin Province as well as central and eastern Liaoning Province. The monthly mean temperature of China was 20.8℃, which was a little higher than the usual. However, it was even 2℃ warmer than the normal in northern Henan Province, central Jiangsu Province and southern Qinghai Province. In June, eight regional torrential rain processes which mostly occurred in South China, and the observed values at many stations reached the standard of extreme precipitation events. Two typhoons were generated and neither of them landed in China in June. There were 44 stations where extreme high temperature events occurred and these stations are mostly located in the regions of Huanghuai, Jianghuai and South China. In addition, the daily maximum temperature at four stations broke the historical record.
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解晋,周宁芳,2021.2021年6月大气环流和天气分析[J].气象,47(9):1162-1168.
XIE Jin,ZHOU Ningfang,2021.Analysis of the June 2021 Atmospheric Circulation and Weather[J].Meteor Mon,47(9):1162-1168.