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active layer

American  

noun

  1. (in Arctic or subarctic regions) the layer of soil, above the permafrost, that thaws during the summer.


Example Sentences

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"If the semiconductor industry wants to succeed with 2D materials, the active layer and the insulating layer must be designed together from the very beginning," emphasizes Mahdi Pourfath.

From Science Daily May 9, 2026

Writing in the paper, the researchers noted: "Expansion of vegetation and especially in wetland areas indicates but also exacerbates permafrost thaw, active layer thickening and thus emissions of greenhouse gasespreviously stored in these Arctic soils."

From Science Daily Feb. 13, 2024

Built in the early 1960s, Arecibo was initially designed to study the Earths ionosphere, the chemically active layer in the upper atmosphere that is ionized by solar radiation.

From Slate Nov. 23, 2020

This sequence of steps is affected by the morphology of the active layer.

From Nature Aug. 15, 2012

Because the frozen permafrost was just a half meter beneath the active layer of soil, all the water on the tundra stayed near the surface.

From "Two Degrees" by Alan Gratz

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