Analysis of the Qinghai-Xizang Plateau Monsoon Evolution and Its Correlation with Soil Moisture

  • ZHOU Juan ,
  • WEN Jun ,
  • WANG Xin ,
  • JIA Dongyu ,
  • CHEN Jinlei
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  • Key Laboratory of Land Surface Process and Climate Change in Cold and Arid Regions, Northwest Institute of Eco-Environment and Resources, Chinese Academy of Sciences, Lanzhou 730000, China;University of Chinese Academy of Sciences, Beijing 100049, China;College of Atmospheric Sciences, Chengdu University of Information Technology, Chengdu 610225, China

Received date: 2015-04-17

  Online published: 2017-02-28

Abstract

The Plateau monsoon evolution is essential to synoptic climatology process over the Qinghai-Xizang Plateau.Based on the European Centre for Medium-Range Weather Forecasts (ECMWF) ERA-Interim reanalysis data from 1979 to 2014, a new Plateau Monsoon Index (ZPMI) which could effectively quantify the monsoon evolution is constructed, and it is compared with the existing plateau monsoon indices TPMI, DPMI and QPMI.The results show that, the onset and retreat time of the Plateau monsoon represented by TPMI is about 1~2 months earlier than that of ZPMI, DPMI; and the ZPMI can better quantify the climatological monthly and inter-annual variations in precipitation over the Qinghai-Xizang Plateau.While the plateau summer and winter monsoons both have similar inter-annual and inter-decadal variation characteristics of a rising trend, and the increasing trend of the summer monsoon is more significant.And the ZPMI is also capable of effectively quantifying the meteorological elements.In stronger plateau summer monsoon years, more (less) precipitation and higher (lower) air temperature appear over the eastern and central (western) plateau, and vice versa.The summer ZPMI and soil moisture in April and May over the Qinghai-Xizang Plateau are used to explore the influences of soil moisture on the Plateau monsoon, and a significant correlation was found between the soil moisture in spring (April-May) over the Qinghai-Xizang Plateau and Plateau summer monsoon.It is found that when the soil moisture over the central and eastern Plateau is higher (lower), while the soil moisture over the western Plateau is lower (higher) than normal, the Plateau summer monsoon may be stronger (weaker).

Cite this article

ZHOU Juan , WEN Jun , WANG Xin , JIA Dongyu , CHEN Jinlei . Analysis of the Qinghai-Xizang Plateau Monsoon Evolution and Its Correlation with Soil Moisture[J]. Plateau Meteorology, 2017 , 36(1) : 45 -56 . DOI: 10.7522/j.issn.1000-0534.2016.00003

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