2023年10月大气环流和天气分析  

Analysis of the October 2023 Atmospheric Circulation and Weather

作　　者：宋佳凝 董林 渠鸿宇 SONG Jianing;DONG Lin;QU Hongyu(National Meteorological Centre,Beijing 100081)

机构地区：[1]国家气象中心,北京100081

出　　处：《气象》2024年第1期126-132,共7页Meteorological Monthly

基　　金：风云卫星应用先行计划(FY-APP-ZX-2023.01)资助。

摘　　要：2023年10月大气环流主要特征是北半球极涡呈多极型分布,欧亚中高纬地区主要由高压脊控制,西太平洋副热带高压位置偏北偏强,呈现带状分布的特征,亚洲东部有热带低值系统活动。10月,全国平均气温为12.0℃,较常年同期(10.6℃)偏高1.4℃,全国平均降水量为35.4 mm,与常年同期(35.6 mm)持平。月内,华西秋雨偏多,持续时间偏长,给部分地区带来暴雨洪涝;台风生成个数偏少,登陆个数偏多,影响较重,其中“小犬”引发华南强降水,“三巴”3次登陆我国,造成华南地区受灾;有2次冷空气过程影响我国;发生1次雾-霾天气过程。The main characteristics of the general atmospheric circulation in October 2023 are that the polar vortex was distributed in a multipolar pattern,the mid-and high-latitude regions in Eurasia were mainly controlled by high-pressure ridges,the western Pacific subtropical high was obviously strong,located to more northward,showing a zonal distribution,and there were tropical depressions in eastern Asia.In October,the monthly mean temperature was 12.0℃,1.4℃higher than that of the same period in normal years(10.6℃).The monthly average precipitation was 35.4 mm,which was the same as the normal value(35.6 mm).During this month,the autumn rainfall in West China was excessive and more prolonged,bringing torrential rains and floods to some areas.The number of generated typhoons was less than normal but above-normal typhoons made landfall,with heavier impacts to the affected areas.Among them,Typhoon Koinu triggered severe precipitation in South China,and Typhoon Samba made landfall in China three times,causing disasters in South China.In addition,there were two cold air processes and one fog-haze weather event during this month.

关 键 词：大气环流 副热带高压 台风 气温偏高 华西秋雨 

分 类 号：P44[天文地球—大气科学及气象学] P458