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Permafrost

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Encyclopedia of Snow, Ice and Glaciers

Synonyms

Perennially cryotic ground

Definition

Permafrost. Ground (soil or rock and included ice and organic material) that remains at or below 0°C for at least 2 consecutive years.

Perennially cryotic ground. Soil or rock at or below 0°C for at least 2 consecutive years, but the material may not be frozen because of freezing-point depression.

Active layer. The layer of ground that is subject to annual thawing and freezing in areas underlain by permafrost.

Ice-rich permafrost. Thaw-sensitive permafrost containing excess ice.

Ground ice. Pore, segregated and/or massive ice that occurs in frozen ground.

Permafrost aggradation. A naturally or artificially caused increase in the thickness and/or areal extent of permafrost.

Permafrost definition

The term “permafrost” was introduced into the English literature by Muller (1947) as an abbreviation of the original Russian term “Permanently frozen ground (soil)” (Sumgin et al., 1940). North American and Russian concepts, however, have differed...

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Bibliography

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Correspondence to Yuri Shur .

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Shur, Y., Jorgenson, M.T., Kanevskiy, M.Z. (2011). Permafrost. In: Singh, V.P., Singh, P., Haritashya, U.K. (eds) Encyclopedia of Snow, Ice and Glaciers. Encyclopedia of Earth Sciences Series. Springer, Dordrecht. https://doi.org/10.1007/978-90-481-2642-2_400

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