2022年8月大气环流和天气分析

Analysis of the August 2022 Atmospheric Circulation and Weather

2022年8月大气环流的主要特征是北半球极涡呈偶极型分布且较常年同期强度偏强,欧亚地区中高纬环流呈纬向型,里海北部高压脊异常偏强。西太平洋副热带高压较常年异常偏西偏强。8月,全国平均气温为22.4℃,较常年同期(21.1℃)偏高1.3℃;全国平均降水量为82.4 mm,比常年同期(107.1 mm)偏少23.1%。月内,高温日数异常偏多,区域高温过程持续影响我国,长江流域等地气象干旱持续发展,我国出现8次暴雨过程。8月共有5个热带气旋在南海和西北太平洋活动,其中2207号台风木兰和2209号台风马鞍登陆我国,生成和登陆个数较常年偏少。强对流天气多发,局地受灾重。

The main characteristics of the general atmospheric circulation in August 2022 are as follows.There were two polar vortex centers in the Northern Hemisphere and they were stronger than normal.The circulation at middle-high latitudes of the Eurasia showed a latitudinal type,and the ridge to the north of Caspian Sea was unusually strong.The western Pacific subtropical high was stronger than that of the climatological normal,and its location was more westerly compared to that in normal years.The monthly mean temperature across China was 22.4℃,higher than normal(21.1℃)by 1.3℃,and the monthly mean precipitation was 82.4 mm,23.1%lower than normal(107.1 mm).During this month,the high temperature days in China were abnormally more as the result of the persistent influence of the regional high temperature events.The meteorological drought condition in the Yangtze River Basin and other places continued to develop.Five tropical cyclones were active over the South China Sea and the western North Pacific,among which Typhoon Mulan(No.2207)and Typhoon Ma-on(No.2209)made landfall in China,but generally the number of landfall typhoon was less than usual.Convection events occurred frequently and there were eight torrential rain processes in this month,causing localized serious damages.