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 establish 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 onset, 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 continuelly; (5)The onset or end of plateau rainy season composite difference show that South Asian high more weaker and souther or the subtropical high more wester and higher or the plateau summer monsoon stronger is beneficial 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.
Tingting WEN
,
Xiaoqing GAO
,
Di YU
,
Hongyan SHEN
,
Ziwen WANG
,
Qingchun WANG
. Circulation Evolution Characteristics of the Qinghai-Xizang Plateau Rainy Season under the Warming Background[J]. Plateau Meteorology, 2021
, 40(5)
: 991
-1001
.
DOI: 10.7522/j.issn.1000-0534.2020.00096
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