Climate Change Research ›› 2016, Vol. 12 ›› Issue (1): 28-36.doi: 10.12006/j.issn.1673-1719.2015.123

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The Variation of Summer Precipitation in South China and Its Relationship with SST Anomalies in the Tropical Pacific

Zhong Quanjia1, 2, Zhang Lifeng1, Ding Ruiqiang2, Qin Jianhuang3   

  1. 1. College of Meteorology and Oceanography, PLA University of Science and Technology, Nanjing 211101, China;
    2. State Key Laboratory of Numerical Modeling for Atmospheric Sciences and Geophysical Fluid Dynamics (LASG), Institute of Atmospheric Physics (IAP), Chinese Academy of Sciences (CAS), Beijing 100029, China; 
    3. Nanjing University of Information Science and Technology, Nanjing 210044, China
  • Received:2015-06-24 Revised:2015-09-22 Online:2016-01-30 Published:2016-01-30


Based on the precipitation data of 48 selected stations in South China, the NCEP/NCAR analysis data during 1958-2008 and the NOAA monthly sea surface temperature (SST) data for the period 1957-2008, The variation features of summer precipitation in South China and its relationship with the SST in the tropical Pacific in winter have been studied using EOF decomposition, correlation, synthesis and other statistical methods. The results indicate that the first mode show consistent anomalous signs in the whole South China region, the Second mode is out-of-phase at the north and south of South China and the third mode is out-of-phase at the east and west of South China. These three modes show obvious interannual and decadal variation. The tropical Pacific SSTA, which corresponds to the first mode rainfall anomaly, has a “-+-”zonal three-pole type pattern along the equatorial Pacific, similar to El Nino-Modoki. The significant positive correlation between SST index and rainfall index also has decadal characteristic. In the period with more precipitation, the southwest summer monsoon and the west Pacific subtropical high (WPSH) are stronger. The ridge position of the WPSH extends westward. The ridge of South Asian high extends eastward and its strength is stronger. All of them are in favor of water vapor transport and convective motion in South China, leading to increased precipitation in South China. Conversely, there will be less precipitation in South China.

Key words: South China, summer precipitation, atmospheric circulation, SST anomalies

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