The Enhancing Effect of the East Asian Subtropical Westerly Jet on Summer Extreme High-Temperature Events over Central-Eastern China Since the Late 1990s  

作　　者：Chujie GAO Yuyu NIU Gen LI Shanlei SUN Bo LU Chaofan LI Bei XU Jinglong HUANG Xiubao SUN 

机构地区：[1]College of Oceanography&Key Laboratory of Marine Hazards Forecasting,Ministry of Natural Resources,Hohai University,Nanjing 210098,China [2]Key Laboratory of Meteorological Disaster,Ministry of Education(KLME)&Collaborative Innovation Center on Forecast and Evaluation of Meteorological Disasters(CIC-FEMD),Nanjing University of Information Science and Technology,Nanjing 210044,China [3]State Key Laboratory of Tropical Oceanography,South China Sea Institute of Oceanology,Chinese Academy of Sciences,Guangzhou 510301,China [4]Laboratory for Climate Studies and CMA-NJU Joint Laboratory for Climate Prediction Studies,National Climate Center,China Meteorological Administration,Beijing 100081,China [5]Xiong’an Institute of Meteorological Artificial Intellegence,Xiong'an 071708,China [6]Center for Monsoon System Research,Institute of Atmospheric Physics,Chinese Academy of Sciences,Beijing 100029,China [7]College of Earth and Planetary Sciences,University of the Chinese Academy of Sciences,Beijing 100049,China [8]College of Intelligent Science and Control Engineering,Jinling Institute of Technology,Nanjing 211169,China

出　　处：《Advances in Atmospheric Sciences》2025年第3期453-466,共14页大气科学进展(英文版)

基　　金：supported by the Natural Science Foundation of China(Grant No:42105025,42075189,42275036,and 42430610);the National Key R&D Program of China under Grant 2021YFA0718000;the China Meteorological Administration Youth Innovation Team(CMA2023QN15);China Meteorological Administration Key Innovation Team(CMA2024ZD07);the development fund of South China Sea Institute of Oceanology of the Chinese Academy of Sciences(SCSIO202203 and SCSIO202208);the Open Research Fund of the State Key Laboratory of Tropical Oceanography(South China Sea Institute of Oceanology,Chinese Academy of Sciences)(LTO2110)。

摘　　要：The increase in frequency and intensity of Extreme High-temperature Events(EHEs)over Central-Eastern China(CEC)in recent decades has severely impacted social development and livelihoods.Using observation and reanalysis datasets,this study explores the effect of the East Asian subtropical westerly jet stream(EAJ)on the CEC EHEs for the summers spanning 1979–2020.Considering its general relative location to the right side of the upper-level jet stream exit region,CEC would theoretically suffer more EHEs with a stronger and northwardly-shifted EAJ in summer due to the likelihood of abnormal subsidence induced by the EAJ.However,such an EAJ–EHE connection has been unstable over the past four decades but has displayed an evident interdecadal change.Before the late 1990s,the interannual variation of the EAJ was manifested mainly by its meridional displacement in the northeastern part of East Asia;thus,the atmospheric responses were essentially located to the east of CEC,exerting less of an influence on the CEC EHEs.However,since the late 1990s,the EAJ variation has featured an intensity change in its center over the northwest portion of the CEC,which has resulted in a westward shift in atmospheric responses to cover the CEC region.Therefore,the EAJ could potentially affect the summer CEC EHEs during 2000–21.Our findings offer support for an in-depth understanding of the formation mechanisms of extreme weather/climate events of this nature and thus provide a scientific reference for seasonal climate predictions.

关 键 词：summer extreme high-temperature events East Asian subtropical jet atmospheric circulation central-eastern China interdecadal change 

分 类 号：P423[天文地球—大气科学及气象学]