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气象:2020,46(3):441-448
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2019年12月大气环流和天气分析
徐冉,桂海林,江琪,张天航
(国家气象中心,北京 100081)
Analysis of the December 2019 Atmospheric Circulation and Weather
XU Ran,GUI Hailin,JIANG Qi,ZHANG Tianhang
(National Meteorological Centre, Beijing 100081)
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投稿时间:2020-02-10    修订日期:2020-02-21
中文摘要: 2019年12月大气环流主要特征为:北半球极涡为偶极型分布,环流呈三波型,东亚槽略偏弱,南支槽偏强,且副热带高压位置偏西。12月,全国平均降水量为11.2 mm,较常年同期(10.5 mm)偏多6.7%;全国平均气温为-2.7℃,较常年同期(-3.2℃)偏高 0.5℃。月内共出现3次较强降水过程和3次中等强度冷空气过程。另外,7—10日、20—26日我国中东部地区发生了两次持续性大范围雾 霾天气过程。
Abstract:The main characteristics of the general atmospheric circulation in December 2019 are as follows. There were two polar vortex centers in the Northern Hemisphere. The circulation presented a three wave pattern in middle high latitudes. The East Asian trough behaved weakly while the south branch trough was stronger. And the subtropical high was located more westward than that in the same period of normal years. Monthly mean precipitation over China was 11.2 mm, which is 6.7% higher than normal (10.5 mm). Monthly mean temperature over China was -2.7℃, which is 0.5℃ higher than normal (-3.2℃). Three relatively severe rainfall events and three cold air processes with moderate strength occurred in December. In addition, two large scale continuous fog haze weather appeared in the central and eastern part of China during 7-10 and 20-26 December.
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徐冉,桂海林,江琪,张天航,2020.2019年12月大气环流和天气分析[J].气象,46(3):441-448.
XU Ran,GUI Hailin,JIANG Qi,ZHANG Tianhang,2020.Analysis of the December 2019 Atmospheric Circulation and Weather[J].Meteor Mon,46(3):441-448.