Journal of Arid Meteorology

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Spatial and Temporal Characteristics of the Onset Date of Rainy Season in Yunnan and Its Relationship with ENSO

CHEN Yan1, GUO Shichang2, LIU Yu3, JU Jianhua1, REN Juzhang1, ZHANG Huizhu2   

  1. 1. Yunnan Institute of Meteorological Sciences, Kunming 650034, China;
    2. Department of Atmospheric Sciences, School of Resource Environment and Earth Science, Yunnan University, Kunming 650091, China;
    3. Yunnan Provincial Climate Center, Kunming 650034, China
  • Online:2017-08-31 Published:2017-08-31


陈  艳1郭世昌2,刘  瑜3琚建华1任菊章1张惠珠2   

  1. 1.云南省气象科学研究所,云南昆明650034;
    2.云南大学资源环境与地球科学学院大气科学系,云南 昆明 650091;
    3.云南省气候中心,云南 昆明 650034
  • 作者简介:陈艳(1976—),女,汉族,云南通海人,博士,主要从事季风气候研究.
  • 基金资助:



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 Nio3.4 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 Nio3.4 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.



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