Mechanism of Long Lifespan Sichuan Basin Vortex's Activity Influence the Precipitation in Sichuan-Chongqing Region on Summer

  • LI Chao ,
  • LI Yueqing ,
  • JIANG Xingwen
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  • Institute of Heavy Rain, China Meterological Administration, Wuhan 430205, China;Hubei Key Laboratory for Heavy Rain Monitoring and Warning Research, Wuhan 430205, China;Institute of Plateau Meteorology, China Meterological Administration, Chengdu 610072, China

Received date: 2015-11-03

  Online published: 2017-06-28

Abstract

Based on the ERA-interim reanalysis data and the daily meteorological precipitation data of 824 China stations during 1983 and 2012, we analysed the inter-annual variation of Sichuan Basin Vortex (SBV) whose lifespan is equal to or more than 24 hours (defined as long lifespan) and the corresponding cause, as well as its influence on seasonal precipitation on summer. The main conclusions are as follows:(1) The birthplace of long lifespan SBV was located in southwest and northeast of Sichuan Basin, SBV could be classified into two types (Southwest Type and Northeast Type) based on the birthplace. (2) The frequency of Southwest Type was much higher than Northwest Type, and Southwest Type contributed much more to seasonal precipitation as a result, however Northeast Type caused much more daily precipitation and influenced broader region in mostly case. Because Southwest Type was stable and less dynamic, its influenced region was limited within its birthplace. However, Northeast type was active, its influenced area was surrounded subtropical high. There was obvious difference on precipitation range between Southwest Type and Northeast Type. (3) As to seasonal scale, the key atmosphere circulation factors which influenced the frequency of the two types were various from each other. When the intensity of long wave trough in middle attitude got stronger, the subtropical high extended westward more, besides the South Branch Trough of the plateau got stronger, it was advantageous to produce more Southwest Type SBV. On the contrary, when the intensity of South Asia high got weaker, Siberia high ridge was stably maintained, as well as the edge of subtropical high was just located near the east of Yun Gui Plateau, it was advantageous to produce more Northeast Type SBV.

Cite this article

LI Chao , LI Yueqing , JIANG Xingwen . Mechanism of Long Lifespan Sichuan Basin Vortex's Activity Influence the Precipitation in Sichuan-Chongqing Region on Summer[J]. Plateau Meteorology, 2017 , 36(3) : 685 -696 . DOI: 10.7522/j.issn.1000-0534.2016.00064

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