Relationships between Thermal Anomalies over the Qinghai-Xizang Plateau and Tropical Indian Ocean in May with Summer Rainfall in Xinjiang

  • Tianzhu WANG ,
  • Yong ZHAO
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  • Plateau Atmosphere & Environment Key Laboratory of Sichuan Province,School of Atmospheric Sciences,Chengdu University of Information Technology,Chengdu 610225,Sichuan,China

Received date: 2019-11-28

  Online published: 2021-02-28

Abstract

Based on the sea surface temperatures (SSTs) data provided by the National Oceanic and Atmospheric Administration (NOAA), reanalysis data provided by the National Center for Environmental Prediction (NCEP)/National Center for Atmospheric Research (NCAR), the surface sensible heat flux calculated at 149 stations in May over the Qinghai-Xizang Plateau (QXP) from 1979 to 2017, and the monthly precipitation data at 81 stations in Xinjiang provided by the Xinjiang Meteorological Information Center, the concurrent and individual effects of thermal anomalies over the tropical Indian Ocean (IO) and the QXP in May on summer rainfall in Xinjiang are analyzed.The results show the thermal anomalies in in May have good heating persistence with summer sensible heat (SH) and summer SSTs over the QXP and tropical IO.The singular value decomposition (SVD) analysis indicates the SH over the eastern QXP (divided by 90E) in May has a good negative correlation with summer rainfall in northern Xinjiang and southwest Tarim Basin (TB), and the SSTs over the tropical IO have a good positive correlation with summer rainfall in western TB.When only considering the heating effects over the QXP, the strengthened (weakened) SH over eastern QXP is corresponded to less (more) summer rainfall in the northern Xinjiang and southwest parts of the TB.When only considering the heating effects over the tropical IO, the warmer (colder) SSTs are corresponded to more (less) summer rainfall over the TB.When corresponding to stronger SH in the QXP and warmer SSTs over the tropical IO in May, the northern Xinjiang (TB) receives less (more) summer rainfall.When corresponding to weaker SH in the QXP and colder SSTs over the tropical IO in May, less summer rainfall occurs over the western TB and northeast Xinjiang and the remaining regions receive more summer rainfall.When the SH is weaker (stronger) over the QXP and the SSTs are warmer (colder) over the tropical IO, the subtropical westerly jet shifts south (north) over central Asia, anomalous south (north) wind prevails over Xinjiang and more (less) water vapor is transported into Xinjiang from the IO.Above all are contributed to more (less) summer rainfall over Xinjiang.

Cite this article

Tianzhu WANG , Yong ZHAO . Relationships between Thermal Anomalies over the Qinghai-Xizang Plateau and Tropical Indian Ocean in May with Summer Rainfall in Xinjiang[J]. Plateau Meteorology, 2021 , 40(1) : 1 -14 . DOI: 10.7522/j.issn.1000-0534.2020.00003

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