Causes of a Typical Southern Flood and Northern Drought Event in 2015 over Eastern China  

作　　者：Zhuoyuan LI Qing YANG Dian YUAN Er LU Zhuguo MA 

机构地区：[1]Key Laboratory of Meteorological Disaster,Ministry of Education(KLME),Joint International Research Laboratory of Climate and Environment Change(ILCEC),Collaborative Innovation Center on Forecast and Evaluation of Meteorological Disasters(CIC-FEMD),Nanjing University of Information Science and Technology,Nanjing 210044,China [2]Key Laboratory of Regional Climate-Environment Research for Temperate East Asia,Institute of Atmospheric Physics,Chinese Academy of Sciences,Beijing 100029,China [3]University of Chinese Academy of Sciences,Beijing 100049,China [4]Xiongan Institute of Innovation,Chinese Academy of Sciences,Xiongan New Area 071800,China

出　　处：《Advances in Atmospheric Sciences》2023年第11期2092-2107,I0014,I0015,共18页大气科学进展（英文版）

基　　金：sponsored by the National Natural Science Foundation of China(Grant Nos.41991281,42130613 and 41705073);the UK-China Research and Innovation Partnership Fund through the Met Office Climate Science for Service Partnership(CSSP)China as part of the Newton Fund;the Jiangsu Collaborative Innovation Center for Climate Change.

摘　　要：The spatial distribution of summer precipitation anomalies over eastern China often shows a dipole pattern,with anti-phased precipitation anomalies between southern China and northern China,known as the“southern flooding and northern drought”(SF-ND)pattern.In 2015,China experienced heavy rainfall in the south and the worst drought since 1979 in the north,which caused huge social and economic losses.Using reanalysis data,the atmospheric circulation anomalies and possible mechanisms related to the summer precipitation anomalies in 2015 were examined.The results showed that both El Niño and certain atmospheric teleconnections,including the Pacific Japan/East Asia Pacific(PJ/EAP),Eurasia pattern(EU),British–Baikal Corridor pattern(BBC),and Silk Road mode(SR),contributed to the dipole pattern of precipitation anomalies.The combination of these factors caused a southwards shift of the western Pacific subtropical high(WPSH)and a weakening of the East Asian summer monsoon.Consequently,it was difficult for the monsoon front and associated rain band to migrate northwards,which meant that less precipitation occurred in northern China while more precipitation occurred in southern China.This resulted in the SF-ND event.Moreover,further analysis revealed that global sea surface temperature anomalies(SSTAs)or sea-ice anomalies were key to stimulating these atmospheric teleconnections.

关 键 词：DROUGHT FLOOD El Niño atmospheric teleconnection sea surface temperature anomaly 

分 类 号：P426.616[天文地球—大气科学及气象学]