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气象:2021,47(4):510-516
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2021年1月大气环流和天气分析
徐冉,江琪,桂海林,尤媛,关良
(国家气象中心,北京 100081)
Analysis of the January 2021 Atmospheric Circulation and Weather
XU Ran,JIANG Qi,GUI Hailin,YOU Yuan,GUAN Liang
(National Meteorological Centre, Beijing 100081)
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投稿时间:2021-03-05    修订日期:2021-03-10
中文摘要: 2021年1月大气环流的主要特征是:北半球极涡呈偶极型分布,欧亚中高纬度环流经向度大,东亚大槽偏西偏强,南支槽偏弱。1月,全国平均降水量为5.6 mm,比常年同期(13.2 mm)偏少58%,为1961年以来第四少;全国平均气温为-4.5℃,比常年同期(-5.0℃)偏高0.5℃。月内降水偏少,共出现1次强冷空气过程、2次沙尘天气过程和1次大范围持续性雾-霾天气过程。其中4—7日,我国中东部地区遭遇的强冷空气过程具有影响范围广、华北黄淮低温极端性显著、大风持续时间长等特点。
Abstract:The main characteristics of the general atmospheric circulation in January 2021 are as follows. Polar vortex was a dipole pattern in the Northern Hemisphere. The atmospheric circulation presented a great meridionality in the mid-high latitudes in Eurasia. The East Asian trough was stronger to the west, and the southern branch trough was weaker in this month. The monthly mean precipitation over China was 5.6 mm, 58% lower than normal (13.2 mm), which is the fourth lowest since 1961. The monthly average temperature was -4.5℃, which is 0.5℃ above the normal. Totally, there was one strong cold air process, two dust weather processes and one largescale fog-haze event in this month. During 4-7 January, a strong cold air process occurred in central and eastern China, characterized by wide range of influence, significant low temperature extremes and long duration of strong winds in northern China.
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基金项目:国家重点研发计划(2019YFC0214602)资助
引用文本:
徐冉,江琪,桂海林,尤媛,关良,2021.2021年1月大气环流和天气分析[J].气象,47(4):510-516.
XU Ran,JIANG Qi,GUI Hailin,YOU Yuan,GUAN Liang,2021.Analysis of the January 2021 Atmospheric Circulation and Weather[J].Meteor Mon,47(4):510-516.