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气象:2021,47(3):381-388
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2020年12月大气环流和天气分析
迟茜元,马学款,江琪,尤媛,关良
(国家气象中心,北京 100081)
Analysis of the December 2020 Atmospheric Circulation and Weather
CHI Xiyuan,MA Xuekuan,JIANG Qi,YOU Yuan,GUAN Liang
(National Meteorological Centre, Beijing 100081)
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投稿时间:2021-01-27    修订日期:2021-02-02
中文摘要: 2020年12月大气环流的主要特征是:北半球极涡呈偶极分布,环流呈三波型,欧亚中高纬度环流经向度大,东亚大槽偏强,南支槽偏弱。12月,全国平均降水量为5.8 mm,比常年同期(10.5 mm)偏少45.3%,全国平均气温为-3.9℃,比常年同期(-3.2℃)偏低0.7℃。月内共出现2次强冷空气过程、2次大范围降水过程和2次大范围雾 霾天气过程。其中27—31日,我国大部分地区遭遇寒潮天气,降温幅度大,影响范围广,多地最低气温突破历史极值。
Abstract:The main characteristics of the general atmospheric circulation in December 2020 are as follows. Polar vortex in the Northern Hemisphere had a dipole distribution, the circulation presented a three-wave pattern in middle-high latitudes. The atmospheric circulation presented a great meridionality in mid-latitudes in Eurasia. The East Asian trough behaved strongly and the southern branch trough was weaker in this month. The monthly mean precipitation over China was 5.8 mm, 45.3 % less than normal (10.5 mm). The national monthly average temperature was -3.9℃, 0.7℃ lower than the normal. Totally, there were two strong cold air processes, two precipitation processes and two large-scale fog-haze events in this month. During 27-31 December, most of China suffered from the cold surge characterized by a sharply drop in temperatures and extremely wide areas being impacted. The lowest temperature in many places exceeded the historical extreme values.
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迟茜元,马学款,江琪,尤媛,关良,2021.2020年12月大气环流和天气分析[J].气象,47(3):381-388.
CHI Xiyuan,MA Xuekuan,JIANG Qi,YOU Yuan,GUAN Liang,2021.Analysis of the December 2020 Atmospheric Circulation and Weather[J].Meteor Mon,47(3):381-388.