The 2022 Extreme Heatwave in Shanghai,Lower Reaches of the Yangtze River Valley:Combined Influences of Multiscale Variabilities  

作　　者：Ping LIANG Zhiqi ZHANG Yihui DING Zeng-Zhen HU Qi CHEN 

机构地区：[1]Key Laboratory of Cities’Mitigation and Adaptation to Climate Change in Shanghai,Shanghai Regional Climate Center,China Meteorological Administration,Shanghai 200030,China [2]National Climate Center,China Meteorological Administration,Beijing 100081,China [3]Climate Prediction Center,NCEP/NWS/NOAA,College Park,MD 20740,USA

出　　处：《Advances in Atmospheric Sciences》2024年第4期593-607,共15页大气科学进展（英文版）

基　　金：the Guangdong Major Project of Basic and Applied Basic Research(Grant No.2020B0301030004);the National Natural Science Foundation of China(Grant No.42175056);the Natural Science Foundation of Shanghai(Grant No.21ZR1457600);Review and Summary Project of China Meteorological Administration(Grant No.FPZJ2023-044);the China Meteorological Administration Innovation and Development Project(Grant No.CXFZ2022J009);the Key Innovation Team of Climate Prediction of the China Meteorological Administration(Grant No.CMA2023ZD03).

摘　　要：In the summer of 2022,China(especially the Yangtze River Valley,YRV)suffered its strongest heatwave(HW)event since 1961.In this study,we examined the influences of multiscale variabilities on the 2022 extreme HW in the lower reaches of the YRV,focusing on the city of Shanghai.We found that about 1/3 of the 2022 HW days in Shanghai can be attributed to the long-term warming trend of global warming.During mid-summer of 2022,an enhanced western Pacific subtropical high(WPSH)and anomalous double blockings over the Ural Mountains and Sea of Okhotsk,respectively,were associated with the persistently anomalous high pressure over the YRV,leading to the extreme HW.The Pacific Decadal Oscillation played a major role in the anomalous blocking pattern associated with the HW at the decadal time scale.Also,the positive phase of the Atlantic Multidecadal Oscillation may have contributed to regulating the formation of the double-blocking pattern.Anomalous warming of both the warm pool of the western Pacific and tropical North Atlantic at the interannual time scale may also have favored the persistency of the double blocking and the anomalously strong WPSH.At the subseasonal time scale,the anomalously frequent phases 2-5 of the canonical northward propagating variability of boreal summer intraseasonal oscillation associated with the anomalous propagation of a weak Madden-Julian Oscillation suppressed the convection over the YRV and also contributed to the HW.Therefore,the 2022 extreme HW originated from multiscale forcing including both the climate warming trend and air-sea interaction at multiple time scales.

关 键 词：extreme heatwave multiscale variability air-sea interaction warming trend Yangtze River Valley SHANGHAI 

分 类 号：P423[天文地球—大气科学及气象学]