Discussion of Plateau Monsoon Index and Its Impact on Precipitation in Sichuan Basin in Midsummer

  • PANG Yishu ,
  • MA Zhenfeng ,
  • YANG Shuqun ,
  • YANG Xiaobo
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  • Sichuan Climate Center, Chengdu 610072, China;Heavy Rain and Drought-Flood Disasters in Plateau and Basin Key Laboratory of Sichuan Province, Chengdu 610072, China;Sichuan Agricultural Meteorological Center, Chengdu 610072, China

Received date: 2015-11-13

  Online published: 2017-08-28

Abstract

A new Qinghai-Tibetan plateau monsoon index was built on the basis of synthetically consideration of the wind and height field variation on Qinghai-Tibetan plateau. After comparing with other indices by statistical methods such as correlation coefficient and wavelet analysis, the new index showed good response to the heat inter-annual variation of Qinghai-Tibetan plateau, and reflected the midsummer height and wind field of Tibetan plateau in a better way. On this base, the relationship between Qinghai-Tibetan plateau monsoon and precipitation of Sichuan Basin in midsummer was analyzed. The results showed that in midsummer, the strengthening of the plateau monsoon led the height over the Bay of Bengal-India strengthened, West Pacific Subtropical High, Ural Blocking High and Northeast Asia Blocking High abnormally enhanced, and the East Asia/Pacific (EAP) teleconnection pattern being "+-+". In the lower troposphere, warm water air was transported from the Arabia sea, the bay of Bengal and the South China Sea to South China by anticyclones circulation around the Indian-Bengal high and West Pacific Subtropical High. On the other side, Northerly airflow between Ural Blocking High and Northeast Asia Blocking High, and northeast airflow over Northeast China brought cold air southward. The warm and cold air met in Sichuan Basin, the convergence and uplifting motion of water vapor led the increasing of local precipitation.

Cite this article

PANG Yishu , MA Zhenfeng , YANG Shuqun , YANG Xiaobo . Discussion of Plateau Monsoon Index and Its Impact on Precipitation in Sichuan Basin in Midsummer[J]. Plateau Meteorology, 2017 , 36(4) : 886 -899 . DOI: 10.7522/j.issn.1000-0534.2016.00027

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