Page 80 - 《高原气象》2022年第1期

高 原 气 象 41 卷
78

Study on Water Vapor Transport Source and Path of Rainstorm

in Sanjiangyuan Area

WANG Meiyue ，WANG Lei ，LI Xiehui ，WANG Chunyuan ，WANG Xiangyue 1
1
3
1，2
1，2
（1. College of Atmospheric Science，Chengdu University of Information Technology，Chengdu 610225，Sichuan，China；
2. Plateau Atmosphere and Environment Key Laboratory of Sichuan Province，Chengdu 610225，Sichuan，China；
3. Zhuanghe Meteorological Bureau，Zhuanghe 116400，Liaoning，China）
Abstract：Based on the NCAR/NCEP reanalysis data，the weather situation and water vapor transport character‐
istics of two typical rainstorm weather processes in Sanjiangyuan on July 22-23（"0722"）and August 2-3（"
0802"）were analyzed firstly. Then，the WRF model was used to output data for driving the HYSPLIT model to
quantitatively analyzing the water vapor transport of the two storms. The results show：（1）The main influence
systems of the two rainstorms are the vortex and shear lines formed in the eastern region of Sanjiangyuan and the
evolution and advance and retreat of the vortex system has great influence on the intensity and fall area of the
rainstorms.（2）The HYSPLIT model uses the high-resolution data output from the WRF model as the initial field
and the simulation works well.（3）There are three main moisture transport routes for the“0722”rainstorm：10
days before the rainstorm，the gas blocks in the northwest path were located in the western region of Xinjiang
and entered the Sanjiangyuan via the northern Qinghai-Xizang Plateau，the moisture transport contribution rate is
16%；The air parcels in the southwest path originate from the north of the Bay of Bengal and are transported to
Sanjiangyuan through the water vapor transport channel of the Yarlung Zangbo River Grand Canyon，with the
water vapor transport contribution rate is 41. 5%；Water vapor in the southwest path existed in Guangxi 10 days
ago and transported to the rainstorm area through Sichuan and other places，with water vapor transport contribu‐
tion rate acbeing 42. 5%.（4）The water vapor of the "0802" rainstorm is mainly transported to the Sanjiangyuan
area via four routes：one route is southwest，and the water vapor of the Bay of Bengal is transported to the rain‐
storm area through the Yarlung Zangbo River Grand Canyon，the water vapor transport contribution rate is 28%.
The remaining three are southeast routes：ten days ago，the main source of water vapor appeared in Guizhou and
Hunan and is transported to Sanjiangyuan in the northwest direction，the contribution rate of water vapor trans‐
portation of the three routes being 23%，23% and 26%，respectively.（5）In general，the main water vapors for
the two rainstorms come from the southwest and southeast paths. The water vapors in the southwest path come
from the Bay of Bengal and are transported to the rainstorm area through the Water vapor transport channel of the
Yarlung Zangbo River Grand Canyon. The water vapors along the southeast path are transferred-toward the north‐
west from Guangdong and Hunan to the rainstorm area. For the rainstorm of "0722"，there are also water vapors
transport along the northwest path，which has a small contribution rate.
Key words：Qinghai-Xizang Plateau；numerical simulation；vapor transport path；vapor transport contribution
rate