Page 94 - 《高原气象》2022年第1期

高 原 气 象 41 卷
92

Gravel Parameterization Schemes for Regional Climate Model RegCM

and Analysis of Its Simulation of Soil Moisture Transportation
over the Different Areas of Qinghai-Xizang Plateau

LIU Yigang ，LÜ Shihua ，MA Cuili ，XU Yue ，LUO Jiangxin 1
1
1
3
1，2
（1. Plateau Atmosphere and Environment Key Laboratory of Sichuan Province，College of Atmosphere Sciences，
Chengdu University of Information Technology，Chengdu 610225，Sichuan，China；
2. Collaborative Innovation Center on Forecast and Evaluation of Meteorological Disasters（CIC-FEMD），
Nanjing University of Information Science & Technology，Nanjing 210044，Jiangsu，China；
3. Baotou Meteorological Bureau，Baotou 014030，Inner-Mongolia，China）

Abstract：In the regional climate model RegCM4. 7 coupled with CLM4. 5，the original soil hydrothermal pa‐
rameterization schemes and the improved gravel parameterization schemes were applied respectively over the
western，central，and southeastern Qinghai-Xizang Plateau，and a site over each area was selected to analyze the
mechanism for the discrepancy between the simulation of the two schemes according to the distribution character‐
istics of the gravel. Based on this，the simulation effect of the gravel parameterization schemes with soil moisture
content was validated using China land surface integration reanalysis data（CRA-40）. Results showed that In the
RegCM4. 7 using the gravel parameterization schemes：the surface moisture input is the major factor affecting
the surface ground-soil hydrological process；Lower gravel content facilitates the downward transportation of
soil water，whereas the impact of higher gravel content on the downward transportation of soil water varies with
different areas of the plateau. the simulation effect on the soil moisture of the gravel parameterization schemes
varies with different areas of the plateau，the simulation effect over the southeast plateau has been improved most
significantly.
Key words：Qinghai-Xizang Plateau；RegCM4. 7；soil gravel parameterization；regional simulation effect