Zonally Asymmetric Temperature Trends near the Northern Middle and High Latitude Stratopause during Winter  

作　　者：Tao WANG Wenshou TIAN Ruhua ZHANG Jiali LUO Wuhu FENG 

机构地区：[1]College of Atmospheric Sciences,Lanzhou University,Lanzhou 730000,China [2]Department of Atmospheric and Oceanic Sciences and Institute of Atmospheric Sciences,Fudan University,Shanghai 200438,China [3]National Centre for Atmospheric Science(NCAS),School of Earth and Environment,University of Leeds,Leeds LS29JT,UK

出　　处：《Journal of Meteorological Research》2023年第4期441-453,共13页气象学报（英文版）

基　　金：Supported by the National Natural Science Foundation of China (42130601 and 42142038)。

摘　　要：The temperature trend near the stratopause is rarely evaluated owing to the limited long-term observations of global temperature. In this study, the spatial patterns of the temperature trends near the northern stratopause are investigated by using satellite and reanalysis datasets. Our analysis reveals a zonally asymmetric temperature trend pattern near the northern mid-to-high latitude stratopause during January, and this pattern underwent an evident transition around the 2000s. From 1980 to 2003, there was a cooling trend in the Western Hemisphere and a warming trend in the Eastern Hemisphere. In contrast, a reversed zonally asymmetric temperature trend pattern existed in the east–west direction from 2003 to 2020. Although the warming trends are statistically insignificant, they contrasted with the overall cooling trend in the upper stratosphere due to ozone depletion and an increase in well-mixed greenhouse gases in recent decades. The zonally asymmetric temperature trends were induced by the transition in the intensity of quasi-stationary planetary wavenumber 1(wave 1) near the stratopause. The increasing(decreasing) trend of the intensity of wave 1 enhanced(weakened) its meridional temperature advection near the stratopause before(after) the 2000s;consequently, a zonally asymmetric temperature trend pattern exists in the east–west direction near the stratopause. The transition in the intensity of the stratospheric wave 1 around the 2000s is most likely caused by the transition in the intensity of wave 1 activity in the troposphere.

关 键 词：stratospheric temperature trend zonally asymmetric temperature pattern quasi-stationary planetary wavenumber 1 

分 类 号：P423[天文地球—大气科学及气象学] P421.32