The co-evolution of East Asian subtropical westerly jet and East Asian summer monsoon during different time periods in the Holocene and its influence on precipitation patterns in China  

作　　者：Yawen LIU Mi YAN Jian LIU Sumin WANG Zhengyu LIU Liang NING Ziyi WANG 

机构地区：[1]Key Laboratory for Virtual Geographic Environment,Ministry of Education/State Key Laboratory Cultivation Base of Geographical Environment Evolution and Regional Response/Jiangsu Center for Collaborative Innovation in Geographical Information Resource Development and Application,School of Geography,Nanjing Normal University,Nanjing,210023,China [2]Jiangsu Provincial Key Laboratory for Numerical Simulation of Large Scale Complex Systems,School of Mathematical Sciences,Nanjing Normal University,Nanjing,210023,China [3]Nanjing Institute of Geography and Limnology,Chinese Academy of Sciences,Nanjing,210008,China [4]Department of Geography,The Ohio State University,Columbus,OH,43210,USA

出　　处：《Science China Earth Sciences》2025年第4期1100-1115,共16页中国科学(地球科学英文版)

基　　金：supported by the Program of Global Change and Mitigation,the Ministry of Science and Technology of China(Grant No.2023YFF0804704);the National Natural Science Foundation of China(Grant Nos.42130604,42075049,42475051,42205055,41971108&41971021);the National Natural Science Foundation International(regional)Cooperation and Exchange Project(Grant No.42111530182);the Open Fund Project of State Key Laboratory of Loess and Quaternary Geology,Institute of Earth Environment,Chinese Academy of Sciences(Grant Nos.SKLLQG1930&SKLLQG1820);the Priority Academic Program Development of Jiangsu Higher Education Institutions(Grant No.164320H116);the Jiangsu Graduate Research and Practice Innovation Program Project(Grant No.KYCX22_1582)。

摘　　要：Generally,the interaction between the East Asian subtropical westerly jet(EASWJ)and the East Asian summer monsoon(EASM)is regarded as a critical dynamic factor in the evolution of precipitation patterns in China.Using simulation results from the transient climate evolution since the last glacial maximum,this study applies the multivariate empirical orthogonal function(MVEOF)analysis method to investigate the co-evolution relationships of the EASWJ and the EASM during the early,middle,and late Holocene,as well as their influence on precipitation patterns in China.The results indicate that all the first MVEOF modes in different time periods of the Holocene display an out-of-phase relationship in the intensity anomaly between the EASWJ and the EASM.However,the jet stream is wider and more tilted in the late Holocene.Under the influence of secondary circulations formed during their co-evolution,a north-south dipolar precipitation pattern in eastern China(“flood in the south and drought in the north”or“drought in the south and flood in the north”)and an east-west dipolar pattern in northern China(“wet in the west and dry in the east”or“wet in the east and dry in the west”)are found in the early and middle Holocene,while in the late Holocene a regionally-consistent precipitation pattern is witnessed across the whole region.In this mode,the precipitation in the middle and late Holocene is primarily dominated by trend changes.The second MVEOF mode reveals that the EASM weakens when the EASWJ shifts eastward and the jet steam axis shortens during the early Holocene,resulting in a north-south dipolar precipitation pattern in eastern China and a regionally-consistent pattern in northern China.In the middle Holocene,dipolar precipitation patterns are also observed in both eastern China and northern China when the EASWJ moves northward and the EASM strengthens,while the moisture condition in North China is less pronounced,and vice versa.In the late Holocene,the intensity anomalies of the EASWJ and the EASM exh

关 键 词：HOLOCENE East Asian subtropical westerly jet East Asian summer monsoon CO-EVOLUTION Precipitation pattern 

分 类 号：P467[天文地球—大气科学及气象学]