Page 40 - 《高原气象》2021年第5期

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Circulation Evolution Characteristics of the Qinghai-Xizang Plateau
Rainy Season under the Warming Background

1，2
1，2
1，2
WEN Tingting ，GAO Xiaoqing ，YU Di ，SHEN Hongyan ，WANG Ziwen ，WANG Qingchun 1，2
3
1，2
（1. Qinghai Climate Centre，Xining 810001，Qinghai，China；
2. Key Laboratory of Disaster Prevention and Mitigation in Qinghai Province，Xining 810001，Qinghai，China；
3. Key Laboratory of Land Surface Process and Climate Change in Cold and Arid Regions，Chinese
Academy of Sciences，Lanzhou 730000，Gansu，China）
Abstract：The article based on the Qinghai-Xizang Plateau 110 stations daily precipitation data and NCEP daily
reanalysis data from May to September from1961 to 2017，and using the methods of the climatic mean rainfall
which through the threshold stably and ordered samples segmentation to divide the Qinghai-Xizang Plateau rainy
season onset and offset date and then analyzed the characteristics of the time and spatial evolution about Qinghai-
Xizang Plateau rainy season onset and offset，finally the anomalous characteristics of atmospheric circulation at
the Qinghai-Xizang Plateau rainy season onset and offset are discussed especially. The results shows that：（1）
Qinghai-Xizang Plateau rainy season onset date in the Qinghai-Xizang Plateau shows an advanced trend，but the
offset date shows an slightly delay trend，thus the Plateau rainy season duration become longer；（2）The estab‐
lish of the Qinghai-Xizang Plateau summer monsoon is helpful to low level airflow convergence，after with the
beginning of East Asian summer monsoon，the Bay of Bengal westsouthern wind provide water for the Qinghai-
Xizang Plateau which is helpful to the plateau precipitation；（3）The South Asia High eatablished in Indochina，
and its westnorthern movement is consistent with the evolution of the Qinghai-Xizang Plateau rainy season on‐
set，and its movemnet of southeast shrinking and weakening is also consistent with the evolution of the plateau
rainy season offset；（4）Before the onset of the Qinghai-Xizang Plateau rainy season，the convective upwelling
first starts at the middle-low levels in the southern part of the plateau，with the advancement of the plateau rainy
season，the convective upwelling is increasing over the whole layer of the plateau from the south to north contin‐
uelly；（5）The onset or end of plateau rainy season composite difference show that South Asian high more weak‐
er and souther or the subtropical high more wester and higher or the plateau summer monsoon stronger is benefi‐
cial to the beginning and ending of the plateau rainy season onset earlier or offset later；Contrawise，the plateau
rainy season onset later or offset earlier.
Key words：Qinghai-Xizang Plateau；onset and offset of rainy season；circulation evolution