Difference Analysis on Influence of EP and CP El Niño of Precipitation in Yunnan in Winter

  • Jianqin ZHOU ,
  • Hongming YAN
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  • Yunnan Climate Centre,Kunming 650034,Yunnan,China

Received date: 2019-10-10

  Online published: 2021-02-28

Abstract

There are few analyses on the effect of different types of SST changes in the equatorial Pacific Ocean of precipitation in Yunnan in winter.Based on daily precipitation observation data of 125 stations in Yunnan and NECP reanalysis data from 1981 to 2017, the authors analyze the differences influence of eastern Pacific (EP) and central Pacific (CP) El Ni?o of precipitation in Yunnan in winter by Partial correction, Composite analysis.It was found that the rainfall in most areas of Yunnan in winter will be more than annual year in EP El Ni?o year, but there was no obvious unusual of rainfall in CP El Ni?o year.With deep study on the physical causes of two types El Ni?o events affect winter precipitation differences, results demonstrate that: Firstly, in the EP El Ni?o year, the Walker circulation has an unusually strong downdraft in the western Pacific, the West Pacific Subtropical High (WPSH) is stronger, and the position is westward than normal.The Hadley circulation has an abnormal updraft at 20°N, which offer an advantage for water vapor transport and convergence enhance in Yunnan.At the same time, the ridge developing between the Balkhash Lake and Baikal in the middle and high latitudes which leader to cold air move south and invade Yunnan along the east side of the plateau.Meeting of cold and warm air in Yunnan causes heavy rain in winter.Secondly, in the CP El Ni?o year, the intensity of downdraft of the Walker circulation in the western Pacific is weaker than EP El Ni?o year.The WPSH is stronger and the position is westward than regular ones but weaker and eastward than EP El Ni?o year.The Hadley circulation has a downdraft at 20°N, which against the water vapor transport and convergence enhance in Yunnan.Meanwhile, the circulation in the middle and high latitudes result no obvious cold air move south and influence Yunnan.So, except the rainfall-days is less than normal in eastern of Yunnan, there is no obvious effect on precipitation in winter in Yunnan in CP El Ni?o year.

Cite this article

Jianqin ZHOU , Hongming YAN . Difference Analysis on Influence of EP and CP El Niño of Precipitation in Yunnan in Winter[J]. Plateau Meteorology, 2021 , 40(1) : 98 -108 . DOI: 10.7522/j.issn.1000-0534.2019.00124

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