2018年3月大气环流和天气分析

Analysis of the March 2018 Atmosphic Circulation and Weather

2018年3月大气环流的主要特征是极涡呈偶极型分布,中高纬环流呈3波型,西太平洋副热带高压强度较常年偏弱,南支槽强度与常年相当。3月全国平均气温7.0℃,较常年同期(4.1℃)偏高2.9℃,为1961年以来同期最高;全国平均降水量29.4mm,接近常年同期(29.5mm)。月内我国中东部地区出现1次全国中等(南方强)冷空气过程,1次北方强冷空气过程;南方地区有5次主要降水过程;北方地区有3次沙尘天气过程;江西、湖北、湖南和广西等省(区)局地遭受风雹袭击。

The main characteristics of the general atmospheric circulation are as follows. Double polar vor tex centers existed in the Northern Hemisphere. The circulation in Eurasian middle-high latitudes showed a three-wave pattern. The strength of Western Pacific subtropical high was a little weaker than normal years, and the intensity of south branch through was almost equal to normal. The monthly mean tempera- ture was 7.0℃, 2.9℃ higher than normal, breaking the record since 1961. The monthly mean precipitati- on amount was 29.4 mm, which is almost equal to normal. One nationwide medium cold air process oc- curred in central and eastern China, and one strong cold air process in northern China in this month. Five obvious rainfall processes occurred in southern China, and three dust weather events happened in northern China. Strong winds and hails hit some areas of Jiangxi, Huhei, Hunan, and Guangxi.