Origin and polycyclic behaviour of tundra thaw slumps, Mackenzie Delta region, Northwest Territories, Canada
Abstract In tundra uplands east of the Mackenzie Delta, retrogressive thaw slumps up to several hectares in area typically develop around lakes. Ground temperatures increase in terrain affected by slumping due to the high thermal conductivity of exposed mineral soils and deep snow accumulation in wi...
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crwiley:10.1002/ppp.642 2024-06-23T07:53:38+00:00 Origin and polycyclic behaviour of tundra thaw slumps, Mackenzie Delta region, Northwest Territories, Canada Kokelj, S. V. Lantz, T. C. Kanigan, J. Smith, S. L. Coutts, R. 2009 http://dx.doi.org/10.1002/ppp.642 https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.1002%2Fppp.642 https://onlinelibrary.wiley.com/doi/pdf/10.1002/ppp.642 en eng Wiley http://onlinelibrary.wiley.com/termsAndConditions#vor Permafrost and Periglacial Processes volume 20, issue 2, page 173-184 ISSN 1045-6740 1099-1530 journal-article 2009 crwiley https://doi.org/10.1002/ppp.642 2024-06-13T04:24:54Z Abstract In tundra uplands east of the Mackenzie Delta, retrogressive thaw slumps up to several hectares in area typically develop around lakes. Ground temperatures increase in terrain affected by slumping due to the high thermal conductivity of exposed mineral soils and deep snow accumulation in winter. Mean annual temperatures at the top of permafrost were several degrees warmer in thaw slumps (−0.1°C to −2.2°C) than beneath adjacent undisturbed tundra (−6.1°C to −6.7°C). Simulations using a two‐dimensional thermal model showed that the thermal disturbance caused by thaw slumping adjacent to tundra lakes can lead to rapid near‐surface lateral talik expansion. Talik growth into ice‐rich materials is likely to cause lake‐bottom subsidence and rejuvenation of shoreline slumping. The observed association of thaw slumps with tundra lakes, the absence of active slumps on the shores of drained lakes where permafrost is aggradational and depressions in the lake bottom adjacent to thaw slumps provide empirical evidence that thermal disturbance, talik enlargement and thawing of subadjacent ice‐rich permafrost can drive the polycyclic behaviour (initiation and growth of slump within an area previously affected by slumping) of lakeside thaw slumps. Copyright © 2009 John Wiley & Sons, Ltd. and Her Majesty the Queen in right of Canada. Article in Journal/Newspaper Ice Mackenzie Delta Northwest Territories permafrost Permafrost and Periglacial Processes Tundra Wiley Online Library Canada Mackenzie Delta ENVELOPE(-136.672,-136.672,68.833,68.833) Northwest Territories Talik ENVELOPE(146.601,146.601,59.667,59.667) Permafrost and Periglacial Processes 20 2 173 184 |
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Open Polar |
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Wiley Online Library |
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crwiley |
language |
English |
description |
Abstract In tundra uplands east of the Mackenzie Delta, retrogressive thaw slumps up to several hectares in area typically develop around lakes. Ground temperatures increase in terrain affected by slumping due to the high thermal conductivity of exposed mineral soils and deep snow accumulation in winter. Mean annual temperatures at the top of permafrost were several degrees warmer in thaw slumps (−0.1°C to −2.2°C) than beneath adjacent undisturbed tundra (−6.1°C to −6.7°C). Simulations using a two‐dimensional thermal model showed that the thermal disturbance caused by thaw slumping adjacent to tundra lakes can lead to rapid near‐surface lateral talik expansion. Talik growth into ice‐rich materials is likely to cause lake‐bottom subsidence and rejuvenation of shoreline slumping. The observed association of thaw slumps with tundra lakes, the absence of active slumps on the shores of drained lakes where permafrost is aggradational and depressions in the lake bottom adjacent to thaw slumps provide empirical evidence that thermal disturbance, talik enlargement and thawing of subadjacent ice‐rich permafrost can drive the polycyclic behaviour (initiation and growth of slump within an area previously affected by slumping) of lakeside thaw slumps. Copyright © 2009 John Wiley & Sons, Ltd. and Her Majesty the Queen in right of Canada. |
format |
Article in Journal/Newspaper |
author |
Kokelj, S. V. Lantz, T. C. Kanigan, J. Smith, S. L. Coutts, R. |
spellingShingle |
Kokelj, S. V. Lantz, T. C. Kanigan, J. Smith, S. L. Coutts, R. Origin and polycyclic behaviour of tundra thaw slumps, Mackenzie Delta region, Northwest Territories, Canada |
author_facet |
Kokelj, S. V. Lantz, T. C. Kanigan, J. Smith, S. L. Coutts, R. |
author_sort |
Kokelj, S. V. |
title |
Origin and polycyclic behaviour of tundra thaw slumps, Mackenzie Delta region, Northwest Territories, Canada |
title_short |
Origin and polycyclic behaviour of tundra thaw slumps, Mackenzie Delta region, Northwest Territories, Canada |
title_full |
Origin and polycyclic behaviour of tundra thaw slumps, Mackenzie Delta region, Northwest Territories, Canada |
title_fullStr |
Origin and polycyclic behaviour of tundra thaw slumps, Mackenzie Delta region, Northwest Territories, Canada |
title_full_unstemmed |
Origin and polycyclic behaviour of tundra thaw slumps, Mackenzie Delta region, Northwest Territories, Canada |
title_sort |
origin and polycyclic behaviour of tundra thaw slumps, mackenzie delta region, northwest territories, canada |
publisher |
Wiley |
publishDate |
2009 |
url |
http://dx.doi.org/10.1002/ppp.642 https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.1002%2Fppp.642 https://onlinelibrary.wiley.com/doi/pdf/10.1002/ppp.642 |
long_lat |
ENVELOPE(-136.672,-136.672,68.833,68.833) ENVELOPE(146.601,146.601,59.667,59.667) |
geographic |
Canada Mackenzie Delta Northwest Territories Talik |
geographic_facet |
Canada Mackenzie Delta Northwest Territories Talik |
genre |
Ice Mackenzie Delta Northwest Territories permafrost Permafrost and Periglacial Processes Tundra |
genre_facet |
Ice Mackenzie Delta Northwest Territories permafrost Permafrost and Periglacial Processes Tundra |
op_source |
Permafrost and Periglacial Processes volume 20, issue 2, page 173-184 ISSN 1045-6740 1099-1530 |
op_rights |
http://onlinelibrary.wiley.com/termsAndConditions#vor |
op_doi |
https://doi.org/10.1002/ppp.642 |
container_title |
Permafrost and Periglacial Processes |
container_volume |
20 |
container_issue |
2 |
container_start_page |
173 |
op_container_end_page |
184 |
_version_ |
1802645387713970176 |