Page 32 - 《高原气象》2025年第3期

高 原 气 象 44 卷
590

Study on the Influence of Different Soil Stratification Schemes on

Soil Freezing and Thawing Process

LIU Zisha， LÜ Shihua， BAO Yiqun
（College of Atmospheric Sciences， Chengdu University of Information Technology/ Sichuan Key Laboratory of Plateau Atmosphere and
Environment / Sichuan Field Scientific Observatory of Chengdu Plain Urban Meteorology and Environment / Sichuan Engineering
Laboratory of Meteorological Disaster Forecasting and Early Warning， Chengdu 610225， Sichuan， China）

Abstract： In this paper， the BCC_AVIM land model and encrypted observation data are used to evaluate the sim‐
ulation performance of different soil stratification schemes on soil temperature and humidity. The results indicate
that the encryption scheme has the best simulation performance. In the BCC_AVIM land model， the soil layer is
defined as ten layers and linearly interpolate the depth of each adjacent node to obtain a new 20-layer scheme， re‐
ferred to as the encryption scheme in this paper. The soil stratification scheme with 20 soli layers in the reference
model CLM5. 0 is also applied to the BCC_AVIM land model， which is called CLM5. 0 scheme in this paper.
Comparing the simulation results of the soil stratification scheme before and after improvement with the encrypt‐
ed observation data， it shows that： （1） The encrypted observation data and the original observation data can well
reflect the changing trend of soil temperature and humidity at the whole vertical level， but for the soil freezing pe‐
riod， the encrypted observation data can better depict the temperature change of shallow soil and the humidity
change of deep soil.（2） For the soil temperature and humidity during the freezing period， the simulation perfor‐
mance of the encryption scheme and CLM5. 0 scheme show improvements compared with the original scheme.
The encryption scheme is closest to the measured temperature and humidity data’s numerical values and ampli‐
tude changes. Furthermore， the encryption scheme is more reasonable in determining freezing time in the soil’s
shallow and middle layers.（3） For the soil temperature and humidity during ablation， the simulation perfor‐
mance of the encryption scheme and CLM5. 0 scheme are enhanced compared with the original scheme. After the
shallow and middle soil layers enter the ablation period， the simulated and measured data of soil temperature and
humidity by the encryption scheme are closer to the numerical values and curve trends.
Key words： soil layering program； soil temperature and humidity； freezing and thawing process； BCC_AVIM
land model