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https://doi.org/10.5194/hess-2020-253
© Author(s) 2020. This work is distributed under
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/hess-2020-253
© Author(s) 2020. This work is distributed under
the Creative Commons Attribution 4.0 License.

Submitted as: research article 15 Jun 2020

Submitted as: research article | 15 Jun 2020

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This preprint is currently under review for the journal HESS.

Understanding the Mass, Momentum and Energy Transfer in the Frozen Soil with Three Levels of Model Complexities

Lianyu Yu1, Yijian Zeng1, and Zhongbo Su1,2 Lianyu Yu et al.
  • 1Faculty of Geo-information and Earth Observation (ITC), University of Twente, Enschede, The Netherlands
  • 2Key Laboratory of Subsurface Hydrology and Ecological Effect in Arid Region of Ministry of Education, School of Water and Environment, Chang’an University, Xi’an, China

Abstract. Frozen ground covers vast area of earth surface and has its important ecohydrological implications for high latitude and high altitude regions under changing climate. However, it is challenging to characterize the simultaneous transfer of mass and energy in frozen soils. Within the modeling framework of STEMMUS (Simultaneous Transfer of Mass, Momentum and Energy in Unsaturated Soil), the model complexity of soil heat and mass transfer varies from uncoupled, to coupled heat and mass transfer, and further to the explicit consideration of airflow (termed as unCPLD, CPLD, and CPLD-AIR, respectively). The impact of different model complexities on understanding the mass, momentum and energy transfer in frozen soil were investigated. The model performance in simulating water and heat transfer and surface latent heat flux was tested on a typical Tibetan Plateau meadow. Results indicate that the CPLD model considerably improved the simulation of soil moisture, temperature and latent heat flux. The analyses of heat budget reveal that the improvement of soil temperature simulations by CPLD model is ascribed to its physical consideration of vapor flow and thermal effect on water flow, with the former mainly functions above the evaporative front and the latter dominates below the evaporative front. The contribution of airflow-induced water and heat transport to the total mass and energy fluxes is negligible. Nevertheless, given the explicit consideration of airflow, vapor flow transfer and its effect on heat transfer were enhanced during the freezing-thawing transition period.

Lianyu Yu et al.

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Data sets

Soil Hydraulic and Thermal Properties for Land Surface Modelling over the Tibetan Plateau H. Zhao, Y. Zeng, Z. Su, S. Lv https://doi.org/10.4121/uuid:c712717c-6ac0-47ff-9d58-97f88082ddc0

HydroThermal Dynamics of Frozen Soils on the Tibetan Plateau during 2015-2016 L. Yu, Y. Zeng, Z. Su, J. Wen https://doi.org/10.4121/uuid:cc69b7f2-2448-4379-b638-09327012ce9b

Lianyu Yu et al.

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Short summary
Three levels of model complexities of soil heat and mass transfer process were investigated to understand soil freeze-thaw mechanisms. Results indicate that coupled water and heat transfer model considerably improved the simulation of soil hydrothermal regime. The vapor flow and thermal effect on water flow are the main mechanisms for the improvements. Given the explicit consideration of airflow, vapor flow and its effects on heat transfer were enhanced during the freeze-thaw transition period.
Three levels of model complexities of soil heat and mass transfer process were investigated to...
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