Impact of late spring Siberian snow on summer rainfall in South-Central China

作     者：Shen, Haibo Li, Fei He, Shengping Orsolini, Yvan J. Li, Jingyi 

作者机构：Nanjing Univ Informat Sci & Technol Collaborat Innovat Ctr Forecast & Evaluat Meteoro Key Lab Meteorol Disaster Minist Educ Nanjing Peoples R China China Southern Power Grid Co Ltd Power Dispatching Control Ctr Guangzhou Peoples R China Univ Bergen Geophys Inst Bergen Norway Bjerknes Ctr Climate Res Bergen Norway NILU Norwegian Inst Air Res Kjeller Norway 

出 版 物：《CLIMATE DYNAMICS》 (气象动力学)

年 卷 期：2020年第54卷第7-8期

页      面：3803-3818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：Bjerknes Climate Prediction Unit National Key R&D Program of China RCN, (276730) Trond Mohn Foundation Trond Mohn stiftelse, (BFS2018TMT01) Trond Mohn stiftelse National Natural Science Foundation of China, NSFC, (41421004, 41505073, 41605059, 41875118) National Natural Science Foundation of China, NSFC Norges Forskningsråd, (244166) Norges Forskningsråd National Key Research and Development Program of China, NKRDPC, (2016YFA0600703) National Key Research and Development Program of China, NKRDPC 

主　　题：Siberian snow water equivalent Precipitation in South-Central China Sea surface temperature over the North Atlantic Siberian soil moisture The Silk Road pattern The meridional displacement of the Asian jet 

摘      要：Located in the Yangtze River Valley and surrounded by mountains, South-Central China (SCC) frequently suffered from natural disasters such as torrential precipitation, landslide and debris flow. Here we provide corroborative evidence for a link between the late spring (May) snow water equivalent (SWE) over Siberia and the summer (July-August, abbr. JA) rainfall in SCC. We show that, in May, anomalously low SWE over Siberia is robustly related to a large warming from the surface to the mid-troposphere, and to a stationary Rossby wave train from Siberia eastward toward the North Atlantic. On the one hand, over the North Atlantic there exhibits a tripole pattern response of sea surface temperature anomalies in May. It persists to some extent in JA and in turn triggers a wave train propagating downstream across Eurasia and along the Asian jet, as the so-called Silk Road pattern (SRP). On the other hand, over northern Siberia the drier soil occurs in JA, accompanied by an overlying anomalous anticyclone through the positive feedback. This anomalous anticyclone favors the tropospheric cooling over southern Siberia, and the meridional (northward) displacement of the Asian jet (JMD) due to the change in the meridional temperature gradient. The combination of the SRP and the JMD facilitates less water vapor transport from the tropical oceans and anomalous descending motion over SCC, and thus suppresses the precipitation. These findings indicate that May Siberian SWE can be exploited for seasonal predictability of SCC precipitation.