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.
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Bibliography
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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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