Impacts of Atlantic sea surface temperature anomalies on Indo-East Asian summer monsoon-ENSO relationship  

作　　者：RONG XinYao ZHANG RenHe LI Tim 

机构地区：[1]Chinese Academy of Meteorological Sciences, Beijing 100086, China [2]International Pacific Research Center and Department of Meteorology, University of Hawaii at Manoa, Honolulu HI 96822, USA

出　　处：《Chinese Science Bulletin》2010年第22期2458-2468,共11页

基　　金：supported by the National Basic Research Program of China (2004CB418302);the National Natural Science Foundation of China (40921003);the International S&T Cooperation Project of the Ministry of Science and Technology of China (2009DFA21430)

摘　　要：In this study, the effect of the tropical North Atlantic (TNA) sea surface temperature (SST) variation in inducing the circulation anomaly in the Indo-East Asian monsoon (IEAM) region is investigated through the observational analysis and numerical model-ing. The observational analysis shows that the TNA summer SST is positively correlated with the preceding winter Ni?o3 SST and is simultaneously correlated with the circulation in the IEAM region. The simultaneous circulation pattern resembles that of the ENSO-decaying summer. The positive correlation between the TNA SST and the Ni?o3 region SST is primarily ascribed to the surface latent heat flux and short wave radiation anomalies induced by the ENSO teleconnection. Coupled general circulation model experiments show that, while including the air-sea coupling in the Atlantic, the model can reproduce the main features of the IEAM circulation, such as an anomalous anticyclone over the western North Pacific (WNP) and southerly anomalies over southeast China. While the climatological Atlantic SST is prescribed, the circulation over the WNP displays a significantly dif-ferent pattern, with an eastward migration of the WNP anticyclone and the associated northerly anomalies over southeast China. It is argued that anticyclonic shear and Ekman divergence associated with the atmospheric Kelvin wave response to the TNA warm SSTA forcing is the primary mechanism for the generation of the anomalous anticyclone in WNP. The results presented in this study provide a teleconnection pattern between TNA and short-term climate variability in IEAM region.In this study, the effect of the tropical North Atlantic （TNA） sea surface temperature （SST） variation in inducing the circulation anomaly in the Indo-East Asian monsoon （IEAM） region is investigated through the observational analysis and numerical modeling. The observational analysis shows that the TNA summer SST is positively correlated with the preceding winter Nino3 SST and is simultaneously correlated with the circulation in the IEAM region. The simultaneous circulation pattern resembles that of the ENSO-decaying summer. The positive correlation between the TNA SST and the Nino3 region SST is primarily ascribed to the surface latent heat flux and short wave radiation anomalies induced by the ENSO teleconnection. Coupled general circulation model experiments show that, while including the air-sea coupling in the Atlantic, the model can reproduce the main features of the IEAM circulation, such as an anomalous anticyclone over the western North Pacific （WNP） and southerly anomalies over southeast China. While the climatological Atlantic SST is prescribed, the circulation over the WNP displays a significantly different pattern, with an eastward migration of the WNP anticyclone and the associated northerly anomalies over southeast China. It is argued that anticyclonic shear and Ekman divergence associated with the atmospheric Kelvin wave response to the TNA warm SSTA forcing is the primary mechanism for the generation of the anomalous anticyclone in WNP. The results presented in this study provide a teleconnection pattern between TNA and short-term climate variability in IEAM region.

关 键 词：海表温度异常 北大西洋 ENSO 东亚季风 夏季季风 短期气候变化 中国东南部 西北太平洋 

分 类 号：P732.6[天文地球—海洋科学] P467