Simulation and Evaluation of Soil Temperature and Moisture during Freeze-thaw Process in Xizang Plateau by CLM5.0

Zhehao ZHANG; Xin LAI; Ge ZHANG; Siyuan YAO; Suyu ZHANG

doi:10.7522/j.issn.1000-0534.2024.00057

Plateau Meteorology >

2025 , Vol. 44 >Issue 1: 32 - 45

DOI: https://doi.org/10.7522/j.issn.1000-0534.2024.00057

Simulation and Evaluation of Soil Temperature and Moisture during Freeze-thaw Process in Xizang Plateau by CLM5.0

Zhehao ZHANG ,
Xin LAI ,
Ge ZHANG ,
Siyuan YAO ,
Suyu ZHANG

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School of Atmospheric Sciences，Plateau Atmosphere and Environment Key Laboratory of Sichuan Province，Joint Laboratory of Climate and Environment Change，Chengdu Plain Urban Meteorology and Environment Observation and Research Station of Sichuan Province，Chengdu 610225，Sichuan，China

Received date: 2023-08-23

Revised date: 2024-04-07

Online published: 2024-04-07

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Abstract

The China Meteorological Forcing Dataset（0.1°×0.1°） from 1979 -2018 was used as atmospheric forcing data to drive CLM5.0 （Community Land Model version 5.0） to simulate soil temperature and moisture changes in the Qinghai-Xizang Plateau region from 1979 to 2018.Divide the soil freeze-thaw process into two stages： freezing period and thawing period.By comparing and validating CLM5.0 simulation with site observation data， assimilation data （GLDAS-Noah）， and satellite remote sensing data （MODIS soil temperature data and ESA CCI-COMBINED soil moisture data） in two stages， this study explores the applicability of CLM5.0 simulation of soil temperature and moisture in the Qinghai-Xizang Plateau.The results indicate that：（1） CLM5.0 can accurately describe the dynamic changes in soil temperature and moisture at stations on the Qinghai-Xizang Plateau.The soil temperature and moisture simulated by CLM5.0 have consistent variation characteristics with the observed data and are numerically close.The accuracy of CLM5.0 simulation is higher than that of GLDAS Noah.CLM5.0 provides a more accurate description of soil temperature at the stations.（2） CLM5.0 can accurately describe the soil temperature and moisture characteristics during the freeze-thaw process in the Qinghai-Xizang Plateau.CLM5.0 simulated soil temperature and moisture show a significant positive correlation with MODIS and ESA CCI-COMBINED remote sensing data on the Qinghai-Xizang Plateau， with correlation coefficients mostly above 0.9.CLM5.0 has relatively better simulation ability for soil temperature in Qinghai-Xizang Plateau areas.CLM5.0 has better simulation ability for soil moisture during thawing periods than during freezing periods.CLM5.0 overestimates the soil temperature of the Qinghai-Xizang Plateau as a whole， with an average deviation mostly between 0~4 ℃.The average deviation of soil moisture simulated by CLM5.0 is mostly between -0.1~0.1 m³·m^-3， and the average deviation of soil moisture during thawing period is relatively small.（3） The soil temperature and moisture data from CLM5.0 simulation， GLDAS-Noah， MODIS， and ESA CCI-COMBINED remote sensing all have similar spatial distribution characteristics， with higher similarity in the spatial distribution characteristics of soil temperature.CLM5.0 has higher spatial resolution and more precise soil stratification， which can better describe the details of soil temperature and moisture.（4） The CLM5.0 simulation data shows an overall warming and drying trend in the Qinghai-Xizang Plateau， while the MODIS and ESA CCI-COMBINED remote sensing data show an overall warming and moistening trend.The trend of soil temperature changes simulated by CLM5.0 is relatively accurate， while there is a greater deviation in the trend of soil moisture changes.

Key words： Qinghai-Xizang Plateau; CLM5.0; freeze-thaw process; soil temperature and moisture

Cite this article

Zhehao ZHANG , Xin LAI , Ge ZHANG , Siyuan YAO , Suyu ZHANG . Simulation and Evaluation of Soil Temperature and Moisture during Freeze-thaw Process in Xizang Plateau by CLM5.0[J]. Plateau Meteorology, 2025 , 44(1) : 32 -45 . DOI: 10.7522/j.issn.1000-0534.2024.00057

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