摘要
2022年5月大气环流的主要特征是:北半球极涡呈单极型分布,强度偏强;中高纬完成了从冬季三波型向夏季四波型的转换,环流呈四波型,欧亚环流经向度较大,副热带高压和南支槽强度与常年相当。全国平均气温为16.7℃,较常年同期偏高0.2℃。全国平均降水量为71.6 mm,较常年同期偏多2%,其中西南及华南地区降水较常年显著偏多。月内,全国范围内共发生4次区域性暴雨天气过程,多省遭受风雹袭击,部分地区受灾较重。此外,3次冷空气过程影响我国,3次沙尘过程影响北方地区,黄淮、江淮等地气象干旱持续发展。
The main characteristic of the general atmospheric circulation in May 2022 is that the single polar vortex center in the Northern Hemisphere was stronger than usual.The circulation finished the transition from a three-wave pattern to a four-wave pattern,the 500 hPa geopotential height presented the distribution of a four-wave pattern in middle-high latitudes of the Northern Hemisphere,and the degree of meridionality was stonger than normal.The strength of Western Pacific subtropical high and the south branch trough were similar to those in normal years.The monthly mean temperature was 16.7℃,0.2℃higher than normal.The monthly mean precipitation amount was 71.6 mm,2%more than normal,of which the precipitation in Southwest China and South China was significantly more than in the normal year.Four regional rainfall processes occurred in China this month and several provinces were attacked by gales and hailstorm,which led to economic losses and casualties to some degrees.In addition,three cold air processes occurred this month,and the northern part of China experienced three sand-dust weather events.The drought maintained or developed in the Huanghuai and Jianghuai Regions.
作者
韩旭卿
张涛
HAN Xuqing;ZHANG Tao(National Meteorological Centre,Beijing 100081)
出处
《气象》
CSCD
北大核心
2022年第8期1070-1076,共7页
Meteorological Monthly
基金
国家重点研发计划(2017YFC1052000)资助。
关键词
大气环流
暴雨
强对流
沙尘
atmospheric circulation
torrential rain
severe convection
sand-dust
