The seasonally thawed surface layer above permafrost.
〔地理〕活性层
Example sentencesExamples
In streams of both regions, flows peak rapidly for several days as snow and ice melt in late May; then, stream discharge attenuates slowly as the active layer thaws.
Consequently, during the summer growing season the active layer of the soil horizon will normally be aerated.
A bear can dig an entrance in a peat bank up to 120 cm deep by digging through the active layer into the permafrost and then digging to excavate the main body of the den.
This allows water to change to freeze and thaw seasonally, creating stresses within the active layer that may lead to sorting of stones of different sizes within the substrate, to the formation of ‘patterned ground’.
The larger and larger trees indicate that the active layer, which thaws each summer, is deeper and deeper, giving roots of large trees room to grow down.
Definition of active layer in US English:
active layer
noun
Geography
The seasonally thawed surface layer above permafrost.
〔地理〕活性层
Example sentencesExamples
A bear can dig an entrance in a peat bank up to 120 cm deep by digging through the active layer into the permafrost and then digging to excavate the main body of the den.
The larger and larger trees indicate that the active layer, which thaws each summer, is deeper and deeper, giving roots of large trees room to grow down.
Consequently, during the summer growing season the active layer of the soil horizon will normally be aerated.
This allows water to change to freeze and thaw seasonally, creating stresses within the active layer that may lead to sorting of stones of different sizes within the substrate, to the formation of ‘patterned ground’.
In streams of both regions, flows peak rapidly for several days as snow and ice melt in late May; then, stream discharge attenuates slowly as the active layer thaws.