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Analysis of the Influence of the Qinghai-Xizang Plateau Weather System on a
Rare Rainstorm Process on the Northern Slope of Kunlun Mountain
ZHANG Junlan 1,2,3 ,YANG Xia 1,2,3 ,SHI Junjie 1,2,3
(1. Urumqi Institute of Desert Meteorology,China Meteorological Administration,Urumqi 830002,Xinjiang,China;
2. Central Asian Atmospheric Science Research Center,Urumqi 830002,Xinjiang,China;
3. Meteorological Observatory of Xinjiang Uygur Autonomous Region,Urumqi 830002,Xinjiang,China)
Abstract:Using the encrypted automatic station data,conventional ground observation and high-altitude sound‐
ing data,NCEP 1°×1° reanalysis data and ECMWF model prediction initial field data(spatial resolution 0. 125°×
0. 125°)in the Tarim Basin of southern Xinjiang,aiming at a rare torrential rain process occurred on the northern
slope of Kunlun Mountain from 24 to 26 June,2019. The influence of plateau weather systems such as South
Asia High,plateau vortex and shear line on the northern slope of Kunlun Mountain was analyzed. The results
showed that the heavy rain occurred under the large-scale circulation of the 100 hPa South Asian high double-
body type converted to the Qinghai-Xizang high pressure haplotype. The 500 hPa mid-low latitudes showed "two
highs sandwiched one low" meridian circulation,and the West Pacific Subtropical High continued to extend west‐
ward. The southerly wind prevails in the periphery,the high pressure of Iran strengthens eastward,and the pla‐
teau shear line and low vortex between the two highs are maintained. In the two water vapor transport paths of
500 hPa westward and southward,the southerly water vapor transport lasts longer. The southerly airstream trans‐
ports water vapor from the Bay of Bengal to the Qinghai-Xizang Plateau and the Kunlun Mountains. Conver‐
gence of water vapor is obvious. Heavy rain occurs in the middle-level water vapor transport and convergence In
the superimposed area,the water vapor source comes from the Bay of Bengal,the Caspian Sea and the Aral
Sea,and the water vapor in the Bay of Bengal contributes more. The high-altitude southerly warm and humid air‐
flow climbs along the low-level "cold cushion",It is conducive to power uplift and aggravates the warm and cold
changes in the vertical direction.
Key words:heavy rain on the northern slope of Kunlun Mountain;Qinghai-Xizang High;plateau vortex and
shear line;low-level "cold cushion"