Thermal Dynamics in Frozen Soil Systems

Frozen soils occupy vast expanses of the Earth’s high-latitude and high-altitude regions, playing a crucial role in hydrology, engineering and climate feedbacks. Thermal dynamics in these systems are governed by the conduction of heat, phase changes between water and ice and the release or absorption of latent heat. As the temperature falls below the freezing point, a freezing front advances downward, redistributing soil moisture and forming ice lenses that alter mechanical strength and permeability. In permafrost terrains, an active layer thaws seasonally above a perpetually frozen substrate, driving ground settlement and influencing ecosystem processes. Accurate characterisation of heat transfer requires detailed knowledge of soil thermal conductivity, which varies with temperature, moisture content, mineralogy and ice content. Modelling approaches range from analytical solutions of the Stefan problem to complex thermo-hydro-mechanical (THM) simulations that capture the coupled interactions among heat flow, fluid movement and soil deformation. Field measurements, laboratory experiments and remote-sensing observations jointly inform these models, supporting applications as diverse as infrastructure design in cold regions, prediction of thaw-induced greenhouse-gas emissions and sustainable management of permafrost landscapes. Recent advances seek to unify constitutive laws, standardise parameter databases and refine numerical schemes to improve forecasts of soil thermal regimes under both current and future climates.

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Thermal Dynamics in Frozen Soil Systems publication trend

The graph below shows the total number of articles in thermal dynamics in frozen soil systems across all publications each year (not limited to Nature Index journals).

Technical terms

Permafrost: Ground that remains at or below 0 °C for at least two consecutive years.

Freezing front: The boundary delineating the interface between frozen and unfrozen soil during cooling.

Ice lens: A segregated layer of ice formed within soil pores as water migrates toward a freezing front.

Thermo-hydro-mechanical coupling: The interdependent interactions among thermal, hydraulic and mechanical processes in soils.

Thermal conductivity: A measure of a material’s ability to conduct heat through conduction.

References

1. State-of-the-Art Constitutive Modelling of Frozen Soils. Archives of Computational Methods in Engineering (2024).
2. Experimental study and numerical modeling of the thermo-hydro-mechanical processes in soil freezing with different frost penetration directions. Acta Geotechnica (2021).
3. Room for improvement: A review and evaluation of 24 soil thermal conductivity parameterization schemes commonly used in land-surface, hydrological, and soil-vegetation-atmosphere transfer models. Earth-Science Reviews (2020).