Аннотация:o understand how climate change affects natural systems and economies, it's essential to study the freeze-thaw patterns and temperature changes in Eurasian soils, which are significant cold-climate zones. This study investigates the long-term persistence and stabilization behavior of soil temperature fluctuations at depths of 80, 120, and 160 cm across three cold climatic zones (Dfc, Dwb, Dfb) in temperate and boreal regions of Eurasia. Relied on nearly 60 years of meteorological observations from Yakutsk, Im. P. Osipenko, and Kamennaya Step stations, we applied Detrended Fluctuation Analysis (DFA), spectral analysis, and Phi_k correlation analysis to assess thermal memory patterns. The results revealed long-range correlations of 1/f–type (pink noise) in subsoil thermal dynamics, particularly in the deeper layers. This indicates that temperature fluctuations are not random but exhibit slowly decaying correlations—so the past continues to influence the future over long durations. The stabilization periods of local fluctuation slopes changed depending on the climate type. They ranged from the shortest in dry winters (Dwb) to the longest in moist summer regimes (Dfb). Seasonal fluctuations significantly influenced soil temperatures. However, this effect dissipated in depth due to greater thermal inertia. Soil temperature showed a weak direct correlation with precipitation and snow depth. These findings emphasize the combined impact of local climatic conditions and global oscillatory drivers on soil thermal regimes. They also highlight the importance of these factors in enhancing climate model parameterization, fostering comprehension of land–atmosphere interactions, and guiding land-use planning in regions susceptible to frost.
