摘要
2021年12月大气环流的主要特征是:北半球极涡呈偶极型分布,东亚大槽偏西偏强,西太平洋副热带高压接近常年同期。12月,全国平均降水量为8.7 mm,比常年同期(10.5 mm)偏少17.1%;全国平均气温为-2.3℃,比常年同期(-3.2℃)偏高0.9℃。月内出现了3次冷空气过程和1次大范围持续性雾-霾天气过程,此外超强台风雷伊正面袭击南沙群岛。
The main characteristics of the general atmospheric circulation in December 2021 are as follows.There were two polar vortex centers in the Northern Hemisphere.The East Asian major trough was strong and westward.The northwestern Pacific subtropical high was close to the normal situation.The monthly mean precipitation amount was 8.7 mm, which is 17.1% less than normal(10.5 mm).The monthly mean temperature was-2.3℃,which is 0.9℃ higher than normal(-3.2℃).There were three nationwide cold wave processes and one large-scale fog-haze processe in this month.In addition,Super Typhoon Rai slammed head-on into the Spratly Islands.
作者
尤媛
马学款
李思腾
关良
YOU Yuan;MA Xuekuan;LI Siteng;GUAN Liang(National Meteorological Centre,Beijing 100081;Institute of Urban Meteorology,Beijing 100089)
出处
《气象》
CSCD
北大核心
2022年第3期386-392,共7页
Meteorological Monthly
关键词
大气环流
寒潮
雾-霾
台风
atmospheric circulation
cold wave
fog-haze
typhoon
