摘要
2020年9月大气环流和天气分析主要特征如下:北半球极涡呈单极型,中高纬地区西风带为4波型分布,西太平洋副热带高压呈东西向带状分布,较常年位置偏东偏南。全国平均降水量为88.1 mm,较常年同期偏多34.9%,为1961年以来累计降水量同期最多。全国平均气温为17.2℃,较常年同期(16.6℃)偏高0.6℃。台风生成和登陆数较常年偏少,但台风美莎克和海神给我国东北地区带来严重大风和暴雨影响,多地日降水量突破当地9月历史极值。
The main characteristics of the general atmospheric circulation in September 2020 are as follows.The polar vortex of Northern Hemisphere presented a single-pole pattern,while the westerlies presented a four-wave pattern in middle-high latitudes.The western Pacific subtropical high was distributed in the east-west direction,more eastward and southward than normal.The monthly mean precipitation amount was 88.1 mm,which is more than its normal value by 34.9%,being the most accumulated precipitation in the same period since 1961.The monthly mean temperature was 17.2℃,0.6℃higher than the climatological mean(16.6℃).The number of landing typhoons generated is less than normal,but Typhoons Maysak and Haishen brought severe gales and rainstorms to Northeast China,making the daily rainfall in many places exceeded the local historical maximum in September.
作者
王海平
许映龙
WANG Haiping;XU Yinglong(National Meteorological Centre,Beijing 100081;University of Chinese Academy of Sciences,Beijing 100049)
出处
《气象》
CSCD
北大核心
2020年第12期1651-1656,共6页
Meteorological Monthly
关键词
大气环流
副热带高压
暴雨
台风
atmospheric circulation
subtropical high
torrential rainfall
typhoon
