Geothermal criterion for assessing the stability of frozen soils in seasonally active permafrost

Since the 1990s, climate variability has significantly increased, revealing various climatic anomalies. A clear trend of rising air temperatures has been observed in the permafrost zone and its adjacent areas, adversely affecting the state of frozen soils. Consequently, it is becoming increasingly important to assess the thermal stability of frozen soils in light of current climate change. As a result, it is becoming increasingly crucial to evaluate the thermal stability of these frozen soils in the context of ongoing climate change. A geothermal criterion (G k ) is suggested to assess the impact of climate change on the temperature regime of frozen soils in areas with seasonally active permafrost. (G k ) is represented through a dimensionless temperature simplex t* = (t i /T e ) and the Fourier criterion. It is intended to analyze experimental data from geothermal permafrost research collected via borehole thermometry. The theoretical basis for the practical use of this proposed criterion has been established, showing its broad applicability and significant potential for interpreting data from long-term in-situ observations of temperature regime development in frozen soils within seasonally active permafrost.