The Linkage between Two Types of El Ni?o Events and Summer Streamflow over the Yellow and Yangtze River Basins

作     者：Dan WANG Aihui WANG Lianlian XU Xianghui KONG Dan WANG;Aihui WANG;Lianlian XU;Xianghui KONG

作者机构：Nansen-Zhu International Research CenterInstitute of Atmospheric PhysicsChinese Academy of SciencesBeijing 100029China University of Chinese Academy of SciencesBeijing 100029China 

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

年 卷 期：2020年第37卷第2期

页      面：160-172页

核心收录：

学科分类：07[理学] 070601[理学-气象学] 0706[理学-大气科学] 

基　　金：the Key Project of the Ministry of Science and Technology of China (Grant No. 2016YFA0602401) the National Natural Science Foundation of China (Grant No. 41875106) 

主　　题：summer streamflow EP El Nino CP El Nino Yellow River basin Yangtze River basin 

摘      要：It is generally agreed that El Nino can be classified into East Pacific(EP)and Central Pacific(CP)***,little is known about the relationship between these two types of El Ni?o and land surface climate *** study investigates the linkage between EP/CP El Ni?o and summer streamflow over the Yellow and Yangtze River basins and their possible *** the Yellow River basin,the anomalous streamflow always manifests as positive(negative)in EP(CP)years,with a correlation coefficient of 0.39(-0.37);while over the Yangtze River basin,the anomalous streamflow shows as positive in both EP and CP years,with correlation coefficients of 0.72 and 0.48,*** of the surface hydrological cycle indicate that the streamflow is more influenced by local evapotranspiration(ET)than precipitation over the Yellow River basin,while it is dominantly affected by precipitation over the Yangtze River *** different features over these two river basins can be explained by the anomalous atmospheric circulation,which is cyclonic(anticyclonic)north(south)of 30°N over East *** years are dominated by two anticyclones,which bring strong water vapor convergence and induce more precipitation but less ET,and subsequently increase streamflow and flooding *** CP years,especially over the Yellow River basin,two cyclones dominate and lead to water vapor divergence and reduce moisture ***,the ET enhances mainly due to local high surface air temperature,which further evaporates water from the *** a result,the streamflow decreases,which will then increase the drought risk.