Circumpolar‐Active‐Layer‐Monitoring (CALM) sites in the Mackenzie Valley, northwestern Canada
Abstract Active‐layer studies have been maintained for more than a decade throughout the 1200 km length of the Mackenzie Valley. An important goal of these programmes is to monitor processes linking climate, permafrost and the active layer. Thirteen sites have been selected from these studies for th...
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crwiley:10.1002/ppp.490 2024-06-02T07:54:14+00:00 Circumpolar‐Active‐Layer‐Monitoring (CALM) sites in the Mackenzie Valley, northwestern Canada Tarnocai, Charles Mark Nixon, F. Kutny, Les 2004 http://dx.doi.org/10.1002/ppp.490 https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.1002%2Fppp.490 https://onlinelibrary.wiley.com/doi/pdf/10.1002/ppp.490 en eng Wiley http://onlinelibrary.wiley.com/termsAndConditions#vor Permafrost and Periglacial Processes volume 15, issue 2, page 141-153 ISSN 1045-6740 1099-1530 journal-article 2004 crwiley https://doi.org/10.1002/ppp.490 2024-05-06T07:01:52Z Abstract Active‐layer studies have been maintained for more than a decade throughout the 1200 km length of the Mackenzie Valley. An important goal of these programmes is to monitor processes linking climate, permafrost and the active layer. Thirteen sites have been selected from these studies for the Circumpolar Active Layer Monitoring programme of the International Permafrost Association. Annual maximum thaw penetration and ground surface movements are measured relative to thaw tubes and soil temperature probes anchored in the permafrost. Active layer thickness, calculated from thaw penetration and surface movement or measured directly, varies more with local soil properties, vegetation and microclimate than with regional atmospheric climate. While depth of thaw penetration has increased at most sites for much of the record, this increase is not always reflected by a proportional increase in active layer thickness because of variable thaw settlement. Air thawing degree‐days (DDT) in the Subarctic and Boreal regions are more than double those in the Arctic regions. These increases in DDT are not reflected in active‐layer depths, suggesting the insulating effect of the surface organic layer, vegetation and snow cover on active‐layer development. Copyright © 2004 John Wiley & Sons, Ltd. Article in Journal/Newspaper Active layer monitoring Active layer thickness Arctic International Permafrost Association Mackenzie Valley permafrost Permafrost and Periglacial Processes Subarctic Wiley Online Library Arctic Canada Mackenzie Valley ENVELOPE(-126.070,-126.070,52.666,52.666) Permafrost and Periglacial Processes 15 2 141 153 |
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Wiley Online Library |
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crwiley |
language |
English |
description |
Abstract Active‐layer studies have been maintained for more than a decade throughout the 1200 km length of the Mackenzie Valley. An important goal of these programmes is to monitor processes linking climate, permafrost and the active layer. Thirteen sites have been selected from these studies for the Circumpolar Active Layer Monitoring programme of the International Permafrost Association. Annual maximum thaw penetration and ground surface movements are measured relative to thaw tubes and soil temperature probes anchored in the permafrost. Active layer thickness, calculated from thaw penetration and surface movement or measured directly, varies more with local soil properties, vegetation and microclimate than with regional atmospheric climate. While depth of thaw penetration has increased at most sites for much of the record, this increase is not always reflected by a proportional increase in active layer thickness because of variable thaw settlement. Air thawing degree‐days (DDT) in the Subarctic and Boreal regions are more than double those in the Arctic regions. These increases in DDT are not reflected in active‐layer depths, suggesting the insulating effect of the surface organic layer, vegetation and snow cover on active‐layer development. Copyright © 2004 John Wiley & Sons, Ltd. |
format |
Article in Journal/Newspaper |
author |
Tarnocai, Charles Mark Nixon, F. Kutny, Les |
spellingShingle |
Tarnocai, Charles Mark Nixon, F. Kutny, Les Circumpolar‐Active‐Layer‐Monitoring (CALM) sites in the Mackenzie Valley, northwestern Canada |
author_facet |
Tarnocai, Charles Mark Nixon, F. Kutny, Les |
author_sort |
Tarnocai, Charles |
title |
Circumpolar‐Active‐Layer‐Monitoring (CALM) sites in the Mackenzie Valley, northwestern Canada |
title_short |
Circumpolar‐Active‐Layer‐Monitoring (CALM) sites in the Mackenzie Valley, northwestern Canada |
title_full |
Circumpolar‐Active‐Layer‐Monitoring (CALM) sites in the Mackenzie Valley, northwestern Canada |
title_fullStr |
Circumpolar‐Active‐Layer‐Monitoring (CALM) sites in the Mackenzie Valley, northwestern Canada |
title_full_unstemmed |
Circumpolar‐Active‐Layer‐Monitoring (CALM) sites in the Mackenzie Valley, northwestern Canada |
title_sort |
circumpolar‐active‐layer‐monitoring (calm) sites in the mackenzie valley, northwestern canada |
publisher |
Wiley |
publishDate |
2004 |
url |
http://dx.doi.org/10.1002/ppp.490 https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.1002%2Fppp.490 https://onlinelibrary.wiley.com/doi/pdf/10.1002/ppp.490 |
long_lat |
ENVELOPE(-126.070,-126.070,52.666,52.666) |
geographic |
Arctic Canada Mackenzie Valley |
geographic_facet |
Arctic Canada Mackenzie Valley |
genre |
Active layer monitoring Active layer thickness Arctic International Permafrost Association Mackenzie Valley permafrost Permafrost and Periglacial Processes Subarctic |
genre_facet |
Active layer monitoring Active layer thickness Arctic International Permafrost Association Mackenzie Valley permafrost Permafrost and Periglacial Processes Subarctic |
op_source |
Permafrost and Periglacial Processes volume 15, issue 2, page 141-153 ISSN 1045-6740 1099-1530 |
op_rights |
http://onlinelibrary.wiley.com/termsAndConditions#vor |
op_doi |
https://doi.org/10.1002/ppp.490 |
container_title |
Permafrost and Periglacial Processes |
container_volume |
15 |
container_issue |
2 |
container_start_page |
141 |
op_container_end_page |
153 |
_version_ |
1800749266071715840 |