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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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.
that avoids dangerous discontinuous permafrost zones. The alternative route has the following advantages:

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