The Unprecedented Extreme Anticyclonic Anomaly over Northeast Asia in July 2021 and Its Climatic Impacts

作     者：Xingyan ZHOU Riyu LU Xingyan ZHOU;Riyu LU

作者机构：Laboratory for Climate StudiesNational Climate CenterChina Meteorological AdministrationBeijing 100081China State Key Laboratory of Numerical Modeling for Atmospheric Sciences and Geophysical Fluid DynamicsInstitute of Atmospheric PhysicsChinese Academy of SciencesBeijing 100029China College of Earth and Planetary SciencesUniversity of Chinese Academy of SciencesBeijing 100049China 

出 版 物：《Advances in Atmospheric Sciences》 (大气科学进展（英文版）)

年 卷 期：2024年第41卷第4期

页      面：608-618页

核心收录：

学科分类：07[理学] 0707[理学-海洋科学] 0706[理学-大气科学] 

基　　金：the National Natural Science Foundation of China(Grant Nos.42005029 and 42130504) the Research Program on Decision Services of China Meteorological Administration(Nos.JCZX2023026 and JCZX2022021) 

主　　题：anomalous anticyclone Northeast Asia surface air temperatures sea surface temperatures 

摘      要：This study investigates the evolution of an extreme anomalous anticyclone(AA)event over Northeast Asia,which was one of the dominant circulation systems responsible for the catastrophic extreme precipitation event in July 2021 in Henan,and further explores the significant impact of this AA on surface temperatures beneath *** results indicate that this AA event over Northeast Asia was unprecedented in terms of intensity and *** AA was very persistent and extremely strong for 10 consecutive days from 13 to 22 July *** long-lived and unprecedented AA led to the persistence of warmer surface temperatures beyond the temporal span of the pronounced 500-hPa anticyclonic signature as the surface air temperatures over land in Northeast Asia remained extremely warm through 29 July ***,the sea surface temperatures in the Sea of Japan/East Sea were extremely high for 30 consecutive days from 13 July to 11 August 2021,persisting well after the weakening or departure of this *** results emphasize the extreme nature of this AA over Northeast Asia in July 2021 and its role in multiple extreme climate events,even over remote ***,possible reasons for this long-lasting AA are explored,and it is suggested to be a byproduct of a teleconnection pattern over extratropical Eurasia during the first half of its life cycle,and of the Pacific-Japan teleconnection pattern during the latter half.