Page 38 - 《高原气象》2025年第5期

高 原 气 象 44 卷
1156

The Characteristics of Water Vapor Transport during the Qinghai-Xizang

Plateau Summer Monsoon from 1980 to 2020

1， 2
1， 2
ZHANGH Huan 1， 2， 3 ， HU Zeyong ， YU Haipeng ， WU Haojie 1， 2， 3 ，
CHENG Shanling 1， 2， 3 ， WANG Guantian 1， 2， 3 ， FAN Weiwei 1， 2
（1. Key Laboratory of Cryospheric Science and Frozen Soil Engineering， Northwest Institute of Eco-Environment and Resources，
Chinese Academy of Sciences， Lanzhou 730000， Gansu， China；
2. Nagqu Plateau Climate and Environment Observation and Research Station of Tibet Autonomous Region， Northwest Institute
of Eco-Environment and Resources， Chinese Academy of Sciences， Nagqu 852000， Xizang， China；
3. University of Chinese Academy of Sciences， Beijing 100049， China）

Abstract： The Qinghai-Xizang Plateau summer monsoon is an important component of the Asian monsoon sys‐
tem， significantly influencing the energy and moisture cycles in the plateau and its surrounding regions. This
study uses JRA-55 monthly reanalysis data from 1980 to 2020 and GPCC monthly precipitation data， combined
with the Qinghai-Xizang Plateau Monsoon Index. Various statistical methods， including correlation analysis， re‐
gression analysis， composite analysis， and dynamic diagnostics， are used in this study. This paper focuses on the
impact of the summer monsoon over the Qinghai-Xizang Plateau on water transport， such as precipitation， atmo‐
spheric circulation， and water budget. The results show that： （1） When the Qinghai-Xizang Plateau summer
monsoon is strong （weak）， precipitation in the central and eastern parts of the plateau increases （decreases）.
（2） From the perspective of water vapor transport， when the summer monsoon over the plateau is stronger， there
is an anomalous anticyclonic circulation over central India， an anomalous westerly airflow to the south of the pla‐
teau， and the water vapor transport over the plateau is primarily dominated by the westerly water vapor transport
channel.（3） Analysed in terms of moisture budget， when the Qinghai-Xizang Plateau summer monsoon is
strong （weak）， moisture inflow at the southern and western boundaries of the plateau increases （decreases），
while moisture inflow at the northern boundary decreases （increases）， resulting in an increase （decrease） in re‐
gional net moisture budget.（4） The impact of the Qinghai-Xizang Plateau summer monsoon on moisture conver‐
gence/divergence is mainly driven by the contribution of the wind’s dynamic component， while the thermal com‐
ponent from moisture advection is relatively small.
Key words： Qinghai-Xizang Plateau； Qinghai-Xizang Plateau summer monsoon； water vapor transport and bud‐
get； climatic impact