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气象:2019,45(7):1028-1036
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2019年4月大气环流和天气分析
周晓敏,张涛
(国家气象中心,北京 100081)
Analysis of the April 2019 Atmospheric Circulation and Weather
ZHOU Xiaomin,ZHANG Tao
(National Meteorological Centre, Beijing 100081)
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投稿时间:2019-05-29    修订日期:2019-06-06
中文摘要: 2019年4月大气环流的主要特征是北半球极涡呈偶极型分布;中高纬环流呈不典型3波型,我国基本为正距平;西太平洋副热带高压与南支槽强度均偏强。全国平均气温为12.7℃,较常年同期(11.0℃)偏高1.7℃,全国平均降水量为49.0 mm,较常年同期(44.7 mm)偏多9.6%。月内共出现2次较强冷空气过程;全国范围内共发生8次大范围强降雨天气过程,同时出现9次强对流过程,多地遭受风雹袭击,局部地区受灾较重;而内蒙古东北部、东北地区发生干旱。此外,北方地区出现4次沙尘天气过程。
Abstract:The main characteristics of the general atmospheric circulation in April 2019 are as follows. Two polar vortex centers were in the Northern Hemisphere. The circulation in middle-high latitudes of the Eurasian showed an atypical three-wave pattern, and there was a positive anomaly of the geopotential height over most of China. The strength of Western Pacific subtropical high and the Bay of Bengal trough were both stronger than the climatological normal. The monthly mean temperature was 12.7℃, higher than the normal (11.0℃) by 1.7℃. The monthly mean precipitation amount was 49 mm, more than the normal (44.7 mm) by 9.6%. Two nationwide strong cold air processes happened in this month. There were eight heavy rainfall events and nine severe convection events throughout the country in this month. Several provinces were attacked by severe thunderstorms and hail disaster while severe droughts occurred in the northeast of Inner Mongolia and Northeast China. In addition, Northern China experienced four sand-dust weather events.
文章编号:     中图分类号:P448,P458    文献标志码:
基金项目:国家重点研发计划(2017YFC1502003)资助
引用文本:
周晓敏,张涛,2019.2019年4月大气环流和天气分析[J].气象,45(7):1028-1036.
ZHOU Xiaomin,ZHANG Tao,2019.Analysis of the April 2019 Atmospheric Circulation and Weather[J].Meteor Mon,45(7):1028-1036.