Page 38 - 《高原气象》2026年第1期

高 原 气 象 45 卷
34

Modelling of the Feedback Effect of Soil Moisture Anomalies

on Precipitation Feedback in Wetlands of
the Three-River Regions

1
QUAN Rui ， LIU Rong ， WANG Zuoliang ， WANG Xin 1
1， 2
1
（1. Key Laboratory of Cryospheric Science and Permafrost Engineering， Northwest Institute of Eco-Environment
and Resources， Lanzhou 730000， Gansu， China；
2. University of Chinese Academy of Sciences， Beijing 100049， China）

Abstract： The Three-River regions， as a crucial water source conservation area in China， plays a crucial role in
maintaining the regional hydrological and climatic stability through its extensive highland wetlands. Considering
the competitive interaction between soil moisture anomalies and precipitation feedback mechanisms under differ‐
ent environmental conditions， this study conducted control and sensitivity experiments based on the WRF meteo‐
rological model， combined with the CTP-HI framework and CAPE index， to assess the precipitation response
low
under soil moisture anomaly conditions. The study preliminarily analyzes the impact characteristics and feedback
mechanisms of soil moisture anomalies on regional weather， particularly precipitation processes. Specifically，
based on transient simplified evaporation experiments and inversion methods， the WRF simulation incorporated
hydrological measurement data from multiple soil samples collected within the study area. The results show that
the hydraulic properties of wetland soils significantly influence surface thermal properties and energy distribu‐
tion. The soil hydraulic parameters obtained using the simplified evaporation method significantly improved the
model’s simulation of latent heat flux， sensible heat flux， surface temperature， 2-meter air temperature， and 2-
meter specific humidity. Soil moisture anomalies have a significant impact on short-term precipitation processes.
Under conditions of soil moisture anomalies， both CAPE and CTP values significantly increase， while HI val‐
low
ues decrease， accompanied by an increase in atmospheric instability and water vapor content， leading to a clear
positive feedback response in precipitation. In contrast， under dry anomaly conditions， CAPE and CTP values
slightly decrease， while HI values increase， accompanied by reduced atmospheric instability and decreased wa‐
low
ter vapor content， with precipitation showing no clear feedback to soil moisture. The hydraulic characteristics of
wetland soils， through regulating surface energy distribution and water vapor flux， significantly affect precipita‐
tion processes at both local and regional scales. Especially under soil moisture anomaly conditions， the hydrologi‐
cal regulation effect of wetland soils plays a crucial role in precipitation feedback mechanisms， further highlight‐
ing their key position in maintaining regional hydrological and climatic stability.
Key words： Three-River regions； wetland environment； wetland soil； soil moisture anomalies； precipitation
feedback