permafrost

(redirected from Discontinuous permafrost zone)
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Related to Discontinuous permafrost zone: permafrost table, Sporadic permafrost, Sporadic permafrost zone

permafrost

permanently frozen ground on which only a thin layer thaws in the summer, as in the high Arctic and Antarctic.
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Available ground temperature measurements for the northern Hudson Bay lowland suggest that most of its area is in the discontinuous permafrost zone.
Internal drainage through taliks has also been advanced to explain shrinkage in lake surface area in the discontinuous permafrost zone of Alaska; however, this process seems unlikely to operate in the Old Crow Basin given that the lakes are underlain by glacio-lacustrine clays, which would restrict groundwater circulation even if permafrost were to degrade significantly.
Most favorable onshore terrain (avoids mountains, earthquake zones, major river crossings, steep slopes, forests and discontinuous permafrost zones.

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