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《Transactions of Atmospheric Sciences》 2018-01
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A strong correlation between Pacific subsurface ocean temperature and East Asian summer monsoon

GUO Shengli;LI Feng;GE Fei;Collaborative Innovation Center on Forecast and Evaluation of Meteorological Disasters(CIC-FEMD)/Key Laboratory of Meteorological Disaster,Ministry of Education(KLME) ,Nanjing University of Information Science & Technology;Jiangsu Sub-bureau of East China Regional Air Traffic Management Bureau of CAAC;College of Atmospheric Sciences /Plateau Atmosphere and Environment Key Laboratory of Sichuan Province,Chengdu University of Information Technology;  
In this study,based on the output of historical ocean temperature analysis program conducted by Japan Meteorological Agency and NCEP/NCAR reanalysis project,a relationship between tropical Pacific Subsurface Ocean Temperature Anomalies( SOTA) and East Asian Summer Monsoon( EASM) is proposed and investigated.The results indicated that there is a strong correlation between SOTA during winter and EASM.Among the three leading modes in the tropical Pacific subsurface temperature, the first mode has a dipole pattern,with warming in the eastern Pacific and cooling in the western Pacific,which is closely related to traditional El Nio, the western Pacific subtropical high( WPSH) is enhanced.An anomalous anticyclone with its southwesterly winds dominating over the western North Pacific,carrying abundant moisture to Yangtze River and Huaihe River Basin as well.Subsequently,it favors a positive precipitation anomaly along with a poor EASM,which in comparison with traditional El Nio,demonstrating that the impact of traditional El Nio is more significant than the EASM.The persistence of SOTA during winter could lead to form sustainable effects,affecting the general circulations over East Asian Pacific.When a continuous negative( positive) SOTA in the warm pool moves eastwards, the Sea Surface Temperature(SST) of East Pacific becomes cold( warm),while the strengthening of overturning due to the temperature of cold( warm) sea causes anomalies in the SST.Consequently,a meridional wave train appears over East Asia in the summer.Under the impact of an anomalous Western North Pacific anticyclone, it highly affects the atmospheric circulation and climate as well.
【Fund】: 国家重大科学研究计划“973”项目(2012CB955200);; 江苏省博士后科研资助计划项目(1402004B)
【CateGory Index】: P425.42;P731.11
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