Abstract
The upper part of the subsurface component of the Earth’s cryosphere—polygonal peatlands—are considered in this paper. The polygonal peatlands are widespread in the cryolithozone in northwestern Siberia. When the upper permafrost layer thaws under the influence of climatic fluctuations, the ice-bearing transition and intermediate layers in the polygonal peatlands serve as a buffer zone. Therefore, the identification of these layers is a crucial task. The specific features of the layers, their relationship with ice of various origins, and the properties of peat have been determined. The differences in the structure of the intermediate layer, associated with polygonal microrelief of the surface, have been revealed. Thawing of the transitional layer against the background of modern warming has been recorded on the basis of monitoring of a seasonally thawed layer. To identify the transitional and intermediate layers, the indicators—the cryogenic structure, degree of preservation, color, water content, and density of peat—have been determined.
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Funding
This work was supported by the Russian Foundation for Basic Research, project no. 18-55-11005 “Mechanisms, Trajectories, and Patchiness of Changes in the Arctic Ecosystems Caused by Climate Warming” (ClimEco) and no. 19-45-890011 “Assessment of polygonal peatlands’ sustainability to the anthropogenic impact under climate change in the northern part of the Pur-Taz interfluve.”
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Translated by V. Krutikova
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Koroleva, E.S., Slagoda, E.A., Melnikov, V.P. et al. Identification Features of the Transition and Intermediate Layers in the Polygonal Peatlands in Northwestern Siberia. Dokl. Earth Sc. 498, 465–470 (2021). https://doi.org/10.1134/S1028334X2106009X
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DOI: https://doi.org/10.1134/S1028334X2106009X