2021年2月大气环流和天气分析  

Analysis of the February 2021 Atmospheric Circulation and Weather

作　　者：胡艺 董全 HU Yi;DONG Quan(National Meteorological Centre,Beijing 100081)

机构地区：[1]国家气象中心,北京100081

出　　处：《气象》2021年第5期638-644,共7页Meteorological Monthly

基　　金：国家重点研发计划(2017YFC1502004);国家气象中心青年基金项目共同资助。

摘　　要：2021年2月大气环流的主要特征为北半球极涡呈偶极型分布,较常年同期明显偏弱,北半球中高纬西风带呈四波型,以纬向环流为主,西北太平洋副热带高压与常年同期相比偏强但范围较小。2月,我国冷空气强度较弱且影响范围小,全国平均气温为1.2℃,较常年同期偏高2.9℃,为1961年以来历史同期最高,出现了极端高温事件,有618个国家气象站的日最高气温突破有气象记录以来2月历史同期极值。月内,全国平均降水量为19.6 mm,较常年同期偏多9.5%。另外,2月中旬我国中东部出现持续大雾天气,月底北方地区出现沙尘天气过程。The main characteristics of the general atmospheric circulation in February 2021 are as follows.There were two polar vortex centers in the Northern Hemisphere and they were weaker than normal.The general atmospheric circulation over mid-high latitudes of the Northern Hemisphere showed a four-wave pattern,and the circulation was of zonal type.The western Pacific subtropical high was stronger than normal but its impact range was small.Cold air processes in this month were weak with small influence scope in China.The monthly mean temperature was 1.2℃,higher than normal by 2.9℃,which is the highest in the same period since 1961.An extreme high temperature event occurred because the daily maximum temperatures at 618 national meteorological stations nationwide exceeded the historical extreme values in the same period in records.In February,the monthly mean precipitation was 19.6 mm,9.5%higher than normal.In addition,in the middle of February,sustained heavy fog weather appeared in the central and eastern part of China,and a sand-dust event occurred across North China at the end of February.

关 键 词：大气环流 冷空气 雨雪天气过程 极端高温 

分 类 号：P448[天文地球—大气科学及气象学] P458