The first 20 years (1978-1979 to 1998-1999) of active-layer development, Illisarvik experimental drained lake site, western Arctic coast, Canada
Active-layer thickness, snow depth, minimum soil temperatures, near-surface ground ice, soil heave, and permafrost temperatures have been measured for over 20 years following the 1978 artificial drainage of Lake Illisarvik. Measurements of active-layer thickness and other variables have been made at...
Published in: | Canadian Journal of Earth Sciences |
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Language: | English |
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2002
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Online Access: | https://ir.library.carleton.ca/pub/1856 https://doi.org/10.1139/e02-068 |
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ftcarletonunivir:oai:carleton.ca:1856 2023-05-15T13:02:56+02:00 The first 20 years (1978-1979 to 1998-1999) of active-layer development, Illisarvik experimental drained lake site, western Arctic coast, Canada Mackay, J.R. (J. Ross) Burn, C. (Christopher R.) 2002-11-01 https://ir.library.carleton.ca/pub/1856 https://doi.org/10.1139/e02-068 en eng https://ir.library.carleton.ca/pub/1856 doi:10.1139/e02-068 Canadian Journal of Earth Sciences vol. 39 no. 11, pp. 1657-1674 info:eu-repo/semantics/other 2002 ftcarletonunivir https://doi.org/10.1139/e02-068 2022-02-06T21:52:06Z Active-layer thickness, snow depth, minimum soil temperatures, near-surface ground ice, soil heave, and permafrost temperatures have been measured for over 20 years following the 1978 artificial drainage of Lake Illisarvik. Measurements of active-layer thickness and other variables have been made at 25-m intervals along the major and minor axes of the oval-shaped drained-lake bed. Permafrost aggradation commenced in the lake bottom during the first winter following drainage. Before the establishment of vegetation, there was little snow cover, minimum ground temperatures were low, and the active layer was relatively thin. However, both snow depth and minimum ground temperatures have risen where vegetation has grown, the active layer has thickened, and in response, the temperature in permafrost has gradually increased. In the lake bottom, the change in snow depth associated with vegetation growth has been the dominant control on variation in active-layer thickness and not summer weather conditions, which are well correlated with thaw depths along an active-layer course established in the adjacent tundra. Changes in elevation of the surface of the lake bed have been measured with respect to some 40 bench marks anchored in permafrost, and indicate vertical movements of the surface associated with frost heave, thaw subsidence, and the growth of aggradational ice. The ground ice content of near-surface permafrost determined by drilling is in close agreement with the measured uplift of the lake bed. The rate of growth of aggradational ice has been -0.5 cm a-1 over 20 years. Other/Unknown Material Active layer thickness Arctic Ice permafrost Tundra Carleton University's Institutional Repository Arctic Canada Canadian Journal of Earth Sciences 39 11 1657 1674 |
institution |
Open Polar |
collection |
Carleton University's Institutional Repository |
op_collection_id |
ftcarletonunivir |
language |
English |
description |
Active-layer thickness, snow depth, minimum soil temperatures, near-surface ground ice, soil heave, and permafrost temperatures have been measured for over 20 years following the 1978 artificial drainage of Lake Illisarvik. Measurements of active-layer thickness and other variables have been made at 25-m intervals along the major and minor axes of the oval-shaped drained-lake bed. Permafrost aggradation commenced in the lake bottom during the first winter following drainage. Before the establishment of vegetation, there was little snow cover, minimum ground temperatures were low, and the active layer was relatively thin. However, both snow depth and minimum ground temperatures have risen where vegetation has grown, the active layer has thickened, and in response, the temperature in permafrost has gradually increased. In the lake bottom, the change in snow depth associated with vegetation growth has been the dominant control on variation in active-layer thickness and not summer weather conditions, which are well correlated with thaw depths along an active-layer course established in the adjacent tundra. Changes in elevation of the surface of the lake bed have been measured with respect to some 40 bench marks anchored in permafrost, and indicate vertical movements of the surface associated with frost heave, thaw subsidence, and the growth of aggradational ice. The ground ice content of near-surface permafrost determined by drilling is in close agreement with the measured uplift of the lake bed. The rate of growth of aggradational ice has been -0.5 cm a-1 over 20 years. |
format |
Other/Unknown Material |
author |
Mackay, J.R. (J. Ross) Burn, C. (Christopher R.) |
spellingShingle |
Mackay, J.R. (J. Ross) Burn, C. (Christopher R.) The first 20 years (1978-1979 to 1998-1999) of active-layer development, Illisarvik experimental drained lake site, western Arctic coast, Canada |
author_facet |
Mackay, J.R. (J. Ross) Burn, C. (Christopher R.) |
author_sort |
Mackay, J.R. (J. Ross) |
title |
The first 20 years (1978-1979 to 1998-1999) of active-layer development, Illisarvik experimental drained lake site, western Arctic coast, Canada |
title_short |
The first 20 years (1978-1979 to 1998-1999) of active-layer development, Illisarvik experimental drained lake site, western Arctic coast, Canada |
title_full |
The first 20 years (1978-1979 to 1998-1999) of active-layer development, Illisarvik experimental drained lake site, western Arctic coast, Canada |
title_fullStr |
The first 20 years (1978-1979 to 1998-1999) of active-layer development, Illisarvik experimental drained lake site, western Arctic coast, Canada |
title_full_unstemmed |
The first 20 years (1978-1979 to 1998-1999) of active-layer development, Illisarvik experimental drained lake site, western Arctic coast, Canada |
title_sort |
first 20 years (1978-1979 to 1998-1999) of active-layer development, illisarvik experimental drained lake site, western arctic coast, canada |
publishDate |
2002 |
url |
https://ir.library.carleton.ca/pub/1856 https://doi.org/10.1139/e02-068 |
geographic |
Arctic Canada |
geographic_facet |
Arctic Canada |
genre |
Active layer thickness Arctic Ice permafrost Tundra |
genre_facet |
Active layer thickness Arctic Ice permafrost Tundra |
op_source |
Canadian Journal of Earth Sciences vol. 39 no. 11, pp. 1657-1674 |
op_relation |
https://ir.library.carleton.ca/pub/1856 doi:10.1139/e02-068 |
op_doi |
https://doi.org/10.1139/e02-068 |
container_title |
Canadian Journal of Earth Sciences |
container_volume |
39 |
container_issue |
11 |
container_start_page |
1657 |
op_container_end_page |
1674 |
_version_ |
1766324638767382528 |