摘要
2017年5月大气环流的主要特征是极涡偏强且呈单极型分布,中高纬环流呈多波型,西太平洋副热带高压强度较常年偏强,南支槽强度较常年偏弱。5月全国平均气温17.1℃,较常年同期偏高0.9℃,为1961年以来第4高;全国平均降水量59.4 mm,比常年同期(69.5 mm)偏少14.5%,但5月7日广州出现破历史极值的极端强降水。月内我国南方地区有5次区域性暴雨天气过程;北方出现极端高温过程;东北西部、华北等地发生严重气象干旱;北方地区有2次沙尘天气过程。
The main characteristics of the general atmospheric circulation in May 2017 are as follows. There was one polar vortex center in the Northern Hemisphere, stronger than usual. The 500 hPa geopotential height presented the distribution of a multi-wave pattern in the high latitude of Northern Hemisphere. The strength of Western Pacific subtropical high was a little stronger than in normal years, and the south branch through was a little weaker. The monthly mean temperature was 17. 1℃, 0.9℃ higher than nor mal, which ranks the fourth highest since 1961. The monthly mean precipitation amount was 59.4 mm, which is less than normal （69. 5 mm） by 14. 5%, whereas an extremely strong precipitation event that broke the historical records occurred in Guangzhou on 7 May. Five rainfall processes occurred in Southern China this month, and an extremely high temperature event happend in Northern China. Severe droughts occurred in the west part of Northeast and North China, and two dust weather events happened in the northern part of China.
出处
《气象》
CSCD
北大核心
2017年第8期1022-1028,共7页
Meteorological Monthly
关键词
大气环流
干旱
暴雨
高温
沙尘
atmospheric circulation, drought, heavy rain, high temperature, sand and dust
