PARAGENESIS OF DEGRADATION AND AGGRADATION PROCESSES IN FROZEN GROUND
F.M. Rivkin1, S.N. Buldovich2, D.A. Kaverin3
1Tyumen Research Centre, Siberian branch of the Russian Academy of Sciences, Earth Cryosphere Institute, Tyumen, Russia
2Lomonosov Moscow State University, Moscow, Russia
3Komi Science Centre of the Ural Branch of the Russian Academy of Sciences, Institute of Biology, Syktyvkar, Russia
Keywords: permafrost, deep position of a permafrost table, frozen ground thaw subsidence, aggradation of frozen ground, perennial ground freezing, frost heaving
Abstract
The regularities of the new formation of frozen ground near the southern boundary of permafrost against the background of a positive climate trend and permafrost degradation are considered. The new formation of permafrost against the background of long-term thawing of frozen ground is considered a paragenetic process. The spatial heterogeneity of frost heaving and thawing of soils leads to the formation of local irregularities within initially flat hydromorphic areas, where conditions become favorable for the new formation of frozen ground. Even minor altitudinal differentiation of the original surface (0.05-0.20 m) can radically change geocryological conditions and form fairly low-temperature permafrost. Thus, new frozen ground formation can occur against the background of general climate warming and permafrost degradation.
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