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《Journal of Arid Meteorology》 2017-04
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Spatial and Temporal Characteristics of the Onset Date of Rainy Season in Yunnan and Its Relationship with ENSO

CHEN Yan;GUO Shichang;LIU Yu;JU Jianhua;REN Juzhang;ZHANG Huizhu;Yunnan Institute of Meteorological Sciences;Department of Atmospheric Sciences,School of Resource Environment and Earth Science,Yunnan University;Yunnan Provincial Climate Center;  
Based on the onset date of rainy season at 124 weather stations of Yunnan Province,NCEP/NCAR reanalysis data,the tropical Pacific sea surface temperature(SST) index from CPC and OLR from NOAA during 1971-2015,the spatial and temporal characteristics of the onset date of Yunnan's rainy season(ODYRS) and its relationship with tropical Pacific SST were investigated by using statistical methods such as correlation analysis,EOF analysis and composite analysis,etc. The results are as follows:(1) ODYRS marched from the south,east and west to the inner of northwestern Yunnan Province,and the intersection characteristic of Asian summer monsoon systems for ODYRS was obvious. The marching from the south to the north was closely related to the advancement of Asian tropical summer monsoon,while that of other two directions were probably influenced by subtropical systems.(2) The influence of preceding tropical Pacific SST on the first spatial mode of ODYRS was significant. In other words,ODYRS in most regions of Yunnan were significantly positive correlation with tropical Pacific SST,especially the Ni1o3. 4 index in preceding March and April,except for a few edge areas in the northwest,west,northeast and southeast of Yunnan.(3) The response of ODYRS to the preceding Ni1o3. 4 index was asymmetric,and the response to the warm events was stronger than the cold events.(4) The preceding tropical Pacific SST could influence Walker circulation and monsoon systems in low latitude,and then affect ODTRS.
【Fund】: 国家自然科学基金(41365007;41565002;41665005)资助
【CateGory Index】: P461.2;P732
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