The Second Decadal Leading Mode of East Asian Summer Monsoon Rainfall  

作　　者：BAO Qing YU Pei 

机构地区：[1]The State Key Laboratory of Numerical Modeling for Atmospheric Sciences and Geophysical Fluid Dynamics (LASG), Institute of Atmospheric Physics, Chinese Academy of Sciences [2]University of Chinese Academy of Sciences

出　　处：《Atmospheric and Oceanic Science Letters》2014年第5期417-421,共5页大气和海洋科学快报（英文版）

基　　金：supported by the National Basic Research Program (973 Program, Grant No. 2012CB417203);the R&D Special Fund for Public Welfare Industry (Meteorology) (Grant No. GYHY201406001);Strategic Leading Science Projects of the Chinese Academy of Sciences (Grant No. XDA11010402);the National National Science Foundation of China (Grant Nos. 91337110 and 40805038)

摘　　要：The first decadal leading mode of East Asian summer rainfall(EASR) is characterized by rainfall anomalies along the East Asian subtropical rain belt. This study focuses on the second decadal leading mode(2DLM), accounting for 17.3% of rainfall decadal variance, as distinct from the other two neighboring modes of EAMR, based on the state-of-the-art in-situ rainfall data.This mode is characterized by a South-China-wet–HuaiheRiver-dry pattern, and is dominated by a quasi-30-yr period. Further analysis reveals the 2DLM corresponds to an enhanced lower-level monsoon jet, an eastward extension of the western North Pacific subtropical high, and a weakened East Asian upper-level westerly jet flow. The Tibetan Plateau surface temperature and Pacific Decadal Oscillation(PDO) are closely linked with the 2DLM. The regressed SST pattern indicates the PDO-like pattern of sea surface temperature anomalies may have a teleconnection relationship with the 2DLM of EASR.The first decadal leading mode of East Asian summer rainfall （EASR） is characterized by rainfall anomalies along the East Asian subtropical rain belt. This study focuses on the second decadal leading mode （2DLM）, accounting for 17.3% of rainfall decadal vari- ance, as distinct from the other two neighboring modes of EAMR, based on the state-of-the-art in-situ rainfall data. This mode is characterized by a South-China-wet-Huaihe- River-dry pattern, and is dominated by a quasi-30-yr pe- riod. Further analysis reveals the 2DLM corresponds to an enhanced lower-level monsoon jet, an eastward extension of the western North Pacific subtropical high, and a weakened East Asian upper-level westerly jet flow. The Tibetan Plateau surface temperature and Pacific Decadal Oscillation （PDO） are closely linked with the 2DLM. The regressed SST pattern indicates the PDO-like pattern of sea surface temperature anomalies may have a telecon- nection relationship with the 2DLM of EASR.

关 键 词：decadal leading mode East Asian summermonsoon Tibetan Plateau Pacific Decadal Oscillation 

分 类 号：P426.6[天文地球—大气科学及气象学]