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active layer

noun
1.
(in arctic or subarctic regions) the layer of soil, above the permafrost, that thaws during the summer.
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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Examples from the web for active layer
  • The active layer of permafrost, the uppermost ground layer, thaws in the summer and freezes in the winter.
  • Plastic solar cells, no matter how well designed, have intrinsic limits dictated by the polymers that make up their active layer.
  • Until about two years ago, the companies who make silicon wafers weren't able to make the active layer thin enough.
  • Surface soils called the active layer thaw out each summer and refreeze in winter.
  • Modeling results can be highly dependent on this active layer thickness.
  • Once that box is selected a new active layer is added to the drop down menu under map layers.
  • In this structure, the active layer is oriented in registry with the nucleating surface.
  • Click the greyed out select tool beside a layer name to make it the active layer for selections.
  • Immediately above the permafrost may be a transitional zone and above that, reaching to the land surface, is the active layer.

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