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  Encyclopedia of Keywords > Nature > Matter > Soil > Active Layer   Michael Charnine

Keywords and Sections
ACTIVE LAYER
TRANSITION ZONE
ICE
PERMAFROST
THICKNESS
CHANGES
DEPTH
DURING
Review of Short Phrases and Links

    This Review contains major "Active Layer"- related terms, short phrases and links grouped together in the form of Encyclopedia article.

Definitions

  1. An active layer is a layer you can interact with and get information about.

Active Layer

  1. Overlying permafrost is a thin active layer that seasonally thaws during the summer.
  2. Plant life can be supported only within the active layer since growth can occur only in soil that is fully thawed for some part of the year. (Web site)
  3. Seasonal frost commonly overlays permafrost and is called the active layer as it will thaw during the summer.
  4. Humlum, O. (1998): Active layer thermal regime at three rock glaciers in Greenland. (Web site)
  5. Marchenko, S.S., Results of monitoring of the active layer in the northern Tien Shan mountains, Earth Cryosphere, v. (Web site)

Transition Zone

  1. Orthels: soils that show little or no cryoturbation (less than one-third of the depth of the active layer). (Web site)
  2. At the surface is the "active layer" which thaws in summer and refreezes in winter (Bockheim and Hinkel). (Web site)
  3. The `active layer' in Cryosols supports biological activity and protects the underlying permafrost. (Web site)
  4. Cryoturbation occurs not only in the active layer, but also in the transition zone during episodic deep thaw events.
  5. Shur also suggested that the transition zone is useful for predicting the long-term (decadal to millennial) changes in thickness of the active layer.

Ice

  1. MACKAY, J.R. 1971. Ground ice in the active layer and the top portion of permafrost.
  2. Water from the active layer in summer seeps into cracks and freezes, starting the growth of vertical ice wedges. (Web site)

Permafrost

  1. The growth of permafrost is permafrost aggradation, which decreases the thickness of the active layer and may be caused by the freezing of taliks. (Web site)
  2. This is especially true in the active layer above the permafrost where freezing and thawing occurs. (Web site)
  3. Program Description : The active layer is a layer of earth materials between the ground surface and permafrost that freezes and thaws on an annual basis.

Thickness

  1. Thickness of the active layer varies by year and location, but is typically 0.6---4 m (2 to 12 feet) thick. (Web site)
  2. The remainder is called discontinuous permafrost, where the active layer may be many feet in depth. (Web site)
  3. Viereck, L.A., 1982. Effects of fire and firelines on active layer thickness and soil temperatures in interior Alaska.

Changes

  1. A frost table marks the upper limit of permafrost, which is overlain by the active layer. (Web site)
  2. Changes in the active layer thickness and permafrost continuity will affect ground water and river runoffs. (Web site)
  3. Near-surface permafrost is highly dynamic; the active layer increases and decreases in depth in response to environmental and climatic changes. (Web site)

Depth

  1. Thus, heat conduction is not the decisive factor in determining temperatures at depth in the active layer. (Web site)
  2. Of this, over half is called continuous permafrost, that is, has an active layer of only a few inches to a foot or so in depth. (Web site)

During

  1. Thus, the primary determinant of active layer thickness is the maximum temperature attained during the summer. (Web site)
  2. Tundra soils are in an unfrozen state for some two or three months of the year during which time the active layer is in a relatively dry condition. (Web site)

Categories

  1. Encyclopedia of Keywords > Nature > Matter > Soil
  2. Glossaries > Glossary of Soil Science /
  3. Books about "Active Layer" in Amazon.com

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  Short phrases about "Active Layer"
  Originally created: April 03, 2008.
  Links checked: January 16, 2013.
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