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Volume 26 Issue 4

Jul.  2009

Article Contents
Article >  ADVANCES IN ATMOSPHERIC SCIENCES  > 2009 >  26(4): 727-735

The Dipole Mode of the Summer Rainfall over East China during 1958--2001

  • 1.

    State Key Laboratory of Severe Weather (LaSW) Chinese Academy of Meteorological Sciences, Beijing 100081; Nansen-Zhu International Research Centre, Institute of Atmospheric Physics,Chinese Academy of Sciences, Beijing 100029,State Key Laboratory of Severe Weather (LaSW) Chinese Academy of Meteorological Sciences, Beijing 100081


doi: 10.1007/s00376-009-9014-6

  • By examining the second leading mode (EOF2) of the summer rainfall in China during 1958--2001 and associated circulations, the authors found that this prominent mode was a dipole pattern with rainfall decreasing to the north of the Yangtze River and increasing to the south. This reverse relationship of the rainfalls to the north and to the south of the Yangtze River was related with the meridional circulations within East Asia and the neighboring region, excited by SST in the South China Sea-northwestern Pacific. When the SST was warmer, the geopotential heights at 500 hPa were positive in the low and high latitudes and negative in the middle latitudes. The anticyclone in the low latitudes favored the subtropical high over the northwestern Pacific (SHNP) shifting southwestward, leading to additional moisture transport over southern China. The anomalous atmospheric circulations along the East Asian coast tends to enhance upward movement over the region. Subsequently, rainfall in southern China is enhanced.
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    • Manuscript History

    Manuscript received: 10 July 2009
    Manuscript revised: 10 July 2009
    通讯作者: 陈斌, bchen63@163.com
    • 1. 

      沈阳化工大学材料科学与工程学院 沈阳 110142

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    The Dipole Mode of the Summer Rainfall over East China during 1958--2001

    • 1. State Key Laboratory of Severe Weather (LaSW) Chinese Academy of Meteorological Sciences, Beijing 100081; Nansen-Zhu International Research Centre, Institute of Atmospheric Physics,Chinese Academy of Sciences, Beijing 100029,State Key Laboratory of Severe Weather (LaSW) Chinese Academy of Meteorological Sciences, Beijing 100081
    • Manuscript received: 2009-07-10
    • Manuscript revised: 2009-07-10

    Abstract: By examining the second leading mode (EOF2) of the summer rainfall in China during 1958--2001 and associated circulations, the authors found that this prominent mode was a dipole pattern with rainfall decreasing to the north of the Yangtze River and increasing to the south. This reverse relationship of the rainfalls to the north and to the south of the Yangtze River was related with the meridional circulations within East Asia and the neighboring region, excited by SST in the South China Sea-northwestern Pacific. When the SST was warmer, the geopotential heights at 500 hPa were positive in the low and high latitudes and negative in the middle latitudes. The anticyclone in the low latitudes favored the subtropical high over the northwestern Pacific (SHNP) shifting southwestward, leading to additional moisture transport over southern China. The anomalous atmospheric circulations along the East Asian coast tends to enhance upward movement over the region. Subsequently, rainfall in southern China is enhanced.

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