Development of the Active Layer, Pingok Island, Alaska.
Depth-of-thaw measurements were made on Pingok Island, Alaska, throughout the 1972 thaw season. The research revealed that initial thaw is rapid and the rate decreases exponentially until a maximum depth is reached. Generally, the base of the active layer conforms to the surface configuration; howev...
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ftdtic:ADA040913 2023-05-15T15:05:04+02:00 Development of the Active Layer, Pingok Island, Alaska. Fisher,Douglas M LOUISIANA STATE UNIV BATON ROUGE COASTAL STUDIES INST 1977-06 text/html http://www.dtic.mil/docs/citations/ADA040913 http://oai.dtic.mil/oai/oai?&verb=getRecord&metadataPrefix=html&identifier=ADA040913 en eng http://www.dtic.mil/docs/citations/ADA040913 APPROVED FOR PUBLIC RELEASE DTIC AND NTIS Snow Ice and Permafrost *FROST *PERMAFROST *TUNDRA THICKNESS SHAPE ALASKA TERRAIN DEPTH THAWING VEGETATION *Active layer(Frost) Pingok Island(Alaska) Arctic thaw WUNR388002 Text 1977 ftdtic 2016-02-20T13:54:12Z Depth-of-thaw measurements were made on Pingok Island, Alaska, throughout the 1972 thaw season. The research revealed that initial thaw is rapid and the rate decreases exponentially until a maximum depth is reached. Generally, the base of the active layer conforms to the surface configuration; however, local variations in the rate of thaw affect the shape and thickness of the active layer. An inversion of the surface topography often develops beneath hummocks that have a low vegetation cover and over ice wedges that are close to the surface. Slope exposure was found to be significant in affecting the thickness of the active layer, whereas moisture content and sediment size of the range discovered on Pingok Island have only minor effects on the depth of thaw. Thaw depths beneath a shallow pond were found to be greater than on the surrounding tundra. The dominant factor in influencing the thickness of the active layer in the study area is considered to be the presence of a vegetation cover. (Author) Text Arctic Ice permafrost Tundra wedge* Alaska Defense Technical Information Center: DTIC Technical Reports database Arctic |
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Open Polar |
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Defense Technical Information Center: DTIC Technical Reports database |
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ftdtic |
language |
English |
topic |
Snow Ice and Permafrost *FROST *PERMAFROST *TUNDRA THICKNESS SHAPE ALASKA TERRAIN DEPTH THAWING VEGETATION *Active layer(Frost) Pingok Island(Alaska) Arctic thaw WUNR388002 |
spellingShingle |
Snow Ice and Permafrost *FROST *PERMAFROST *TUNDRA THICKNESS SHAPE ALASKA TERRAIN DEPTH THAWING VEGETATION *Active layer(Frost) Pingok Island(Alaska) Arctic thaw WUNR388002 Fisher,Douglas M Development of the Active Layer, Pingok Island, Alaska. |
topic_facet |
Snow Ice and Permafrost *FROST *PERMAFROST *TUNDRA THICKNESS SHAPE ALASKA TERRAIN DEPTH THAWING VEGETATION *Active layer(Frost) Pingok Island(Alaska) Arctic thaw WUNR388002 |
description |
Depth-of-thaw measurements were made on Pingok Island, Alaska, throughout the 1972 thaw season. The research revealed that initial thaw is rapid and the rate decreases exponentially until a maximum depth is reached. Generally, the base of the active layer conforms to the surface configuration; however, local variations in the rate of thaw affect the shape and thickness of the active layer. An inversion of the surface topography often develops beneath hummocks that have a low vegetation cover and over ice wedges that are close to the surface. Slope exposure was found to be significant in affecting the thickness of the active layer, whereas moisture content and sediment size of the range discovered on Pingok Island have only minor effects on the depth of thaw. Thaw depths beneath a shallow pond were found to be greater than on the surrounding tundra. The dominant factor in influencing the thickness of the active layer in the study area is considered to be the presence of a vegetation cover. (Author) |
author2 |
LOUISIANA STATE UNIV BATON ROUGE COASTAL STUDIES INST |
format |
Text |
author |
Fisher,Douglas M |
author_facet |
Fisher,Douglas M |
author_sort |
Fisher,Douglas M |
title |
Development of the Active Layer, Pingok Island, Alaska. |
title_short |
Development of the Active Layer, Pingok Island, Alaska. |
title_full |
Development of the Active Layer, Pingok Island, Alaska. |
title_fullStr |
Development of the Active Layer, Pingok Island, Alaska. |
title_full_unstemmed |
Development of the Active Layer, Pingok Island, Alaska. |
title_sort |
development of the active layer, pingok island, alaska. |
publishDate |
1977 |
url |
http://www.dtic.mil/docs/citations/ADA040913 http://oai.dtic.mil/oai/oai?&verb=getRecord&metadataPrefix=html&identifier=ADA040913 |
geographic |
Arctic |
geographic_facet |
Arctic |
genre |
Arctic Ice permafrost Tundra wedge* Alaska |
genre_facet |
Arctic Ice permafrost Tundra wedge* Alaska |
op_source |
DTIC AND NTIS |
op_relation |
http://www.dtic.mil/docs/citations/ADA040913 |
op_rights |
APPROVED FOR PUBLIC RELEASE |
_version_ |
1766336822209675264 |