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气象:2016,42(3):382-388
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2015年12月大气环流和天气分析
(国家气象中心,北京 100081)
Analysis of the December 2015 Atmospheric Circulation and Weather
(National Meteorological Centre, Beijing 100081)
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投稿时间:2016-02-19    修订日期:2016-02-24
中文摘要: 2015年12月大气环流主要特征如下:北半球极涡呈单极型分布,中心位于格陵兰岛附近,欧亚中高纬环流呈两槽一脊型;南支槽较活跃,平均位置大致位于90°E,副热带高压偏强,面积偏大。12月,全国平均气温为-2.1℃,较常年同期(-3.2℃)偏高1.1℃。全国降水量分布不均匀,南方地区多阴雨天气,江南大部、华南大部出现100~200 mm降水,全国平均降水量24.1 mm,较常年同期(10.5 mm)偏多1.3倍,为1951年以来同期最多。月内,我国出现三次冷空气过程、三次主要降水过程及两次大范围雾 霾天气过程。其中19—25日雾 霾天气过程具有持续时间长、影响范围广、空气污染程度重的特点,重度霾面积为2015年之最。
Abstract:The main characteristics of the general atmospheric circulation in December 2015 are as follows: There is one polar vortex center in the Northern Hemisphere, located near Greenland. The Eurasia mid high latitude circulation presents the trough ridge trough pattern. The south branch trough behaves actively, lying around 90°E averagely. The subtropical high is stronger and has larger area than normal years. The monthly mean temperature over China is -2.1℃, 1.1℃ higher than normal (-3.2℃). The distribution of precipitation is inhomogeneous. Large scale rainy weather appears in the southern part of China. The monthly precipitation in the south of the Yangtze River and South China is 100-200 mm, and for the whole country it is 24.1 mm, 1.3 times more than normal (10.5 mm), which is the maximum value for the corresponding periods since 1951. There are three cold air processes, three major rainfall processes and two large scale fog haze weather processes during this month, of which the fog haze event from 19 to 25 December is characterized by long duration, large scale and heavy air pollution, and the haze affected area is the largest in 2015.
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基金项目:公益性行业(气象)科研专项(GYHY201306015)及气象关键技术集成与应用项目(CMAGJ2015M70; CMAGJ2014Z16)共同资助
引用文本:
李明,花丛,马学款,2016.2015年12月大气环流和天气分析[J].气象,42(3):382-388.
LI Ming,HUA Cong,MA Xuekuan,2016.Analysis of the December 2015 Atmospheric Circulation and Weather[J].Meteor Mon,42(3):382-388.