Active layer

Active layer

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

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Part of Speech: noun
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Blossary:
Industry/Domain: Earth science
Category: Soil science
Company: Soil Science Society of America
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Related terms

active layer

Earth science; Soil science

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

active layer

Geography; Physical geography

The upper few metres of soil in a periglacial area which undergoes thawing in summer and is prone to mass movement relative to the permafrost layer below.

active layer

Weather; Meteorology

That part of the soil included with the suprapermafrost layer (i.e., existing above permafrost) that usually freezes in winter and thaws in summer. Its bottom surface is the frost ...

active layer

Earth science; Geology

The name given to the upper part of the soil in periglacial areas (experiencing permafrost conditions) which undergoes seasonal thawing. This active layer becomes saturated and ...

active layer

Geography; Geography

In periglacial conditions, where permafrost exists, only the upper layer of ground thaws in summer. This upper layer, which is affected by summer thawing and winter freezing, is ...