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Coupling of the Calculated Freezing and Thawing Front Parameterization in the Earth System Model CAS-ESM

Coupling of the Calculated Freezing and Thawing Front Parameterization in the Earth System Model... The soil freezing and thawing process affects soil physical properties, such as heat conductivity, heat capacity, and hydraulic conductivity in frozen ground regions, and further affects the processes of soil energy, hydrology, and carbon and nitrogen cycles. In this study, the calculation of freezing and thawing front parameterization was implemented into the earth system model of the Chinese Academy of Sciences (CAS-ESM) and its land component, the Common Land Model (CoLM), to investigate the dynamic change of freezing and thawing fronts and their effects. Our results showed that the developed models could reproduce the soil freezing and thawing process and the dynamic change of freezing and thawing fronts. The regionally averaged value of active layer thickness in the permafrost regions was 1.92 m, and the regionally averaged trend value was 0.35 cm yr−1. The regionally averaged value of maximum freezing depth in the seasonally frozen ground regions was 2.15 m, and the regionally averaged trend value was −0.48 cm yr−1. The active layer thickness increased while the maximum freezing depth decreased year by year. These results contribute to a better understanding of the freezing and thawing cycle process. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Advances in Atmospheric Sciences Springer Journals

Coupling of the Calculated Freezing and Thawing Front Parameterization in the Earth System Model CAS-ESM

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References (47)

Publisher
Springer Journals
Copyright
Copyright © Institute of Atmospheric Physics/Chinese Academy of Sciences, and Science Press and Springer-Verlag GmbH Germany, part of Springer Nature 2023
ISSN
0256-1530
eISSN
1861-9533
DOI
10.1007/s00376-023-2203-x
Publisher site
See Article on Publisher Site

Abstract

The soil freezing and thawing process affects soil physical properties, such as heat conductivity, heat capacity, and hydraulic conductivity in frozen ground regions, and further affects the processes of soil energy, hydrology, and carbon and nitrogen cycles. In this study, the calculation of freezing and thawing front parameterization was implemented into the earth system model of the Chinese Academy of Sciences (CAS-ESM) and its land component, the Common Land Model (CoLM), to investigate the dynamic change of freezing and thawing fronts and their effects. Our results showed that the developed models could reproduce the soil freezing and thawing process and the dynamic change of freezing and thawing fronts. The regionally averaged value of active layer thickness in the permafrost regions was 1.92 m, and the regionally averaged trend value was 0.35 cm yr−1. The regionally averaged value of maximum freezing depth in the seasonally frozen ground regions was 2.15 m, and the regionally averaged trend value was −0.48 cm yr−1. The active layer thickness increased while the maximum freezing depth decreased year by year. These results contribute to a better understanding of the freezing and thawing cycle process.

Journal

Advances in Atmospheric SciencesSpringer Journals

Published: Sep 1, 2023

Keywords: frozen ground; freezing and thawing fronts; maximum freezing depth; active layer thickness; earth system model CAS-ESM; 冻土; 冻融界面; 最大冻结深度; 活动层厚度; 地球系统模式CAS-ESM

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