Active‐layer characteristics and summer climatic indices, Mackenzie Valley, Northwest Territories, Canada
Abstract Summer thaw depths at eight monitoring sites in the Mackenzie Valley, determined from probing of grids and thaw tubes, are used to characterise the spatial and temporal variations in active‐layer thickness and to investigate linkages to climatic variations. Intra‐site variability in thaw de...
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crwiley:10.1002/ppp.651 2024-09-15T18:18:12+00:00 Active‐layer characteristics and summer climatic indices, Mackenzie Valley, Northwest Territories, Canada Smith, Sharon L. Wolfe, Stephen A. Riseborough, Daniel W. Nixon, F. Mark 2009 http://dx.doi.org/10.1002/ppp.651 https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.1002%2Fppp.651 https://onlinelibrary.wiley.com/doi/pdf/10.1002/ppp.651 en eng Wiley http://onlinelibrary.wiley.com/termsAndConditions#vor Permafrost and Periglacial Processes volume 20, issue 2, page 201-220 ISSN 1045-6740 1099-1530 journal-article 2009 crwiley https://doi.org/10.1002/ppp.651 2024-08-22T04:18:00Z Abstract Summer thaw depths at eight monitoring sites in the Mackenzie Valley, determined from probing of grids and thaw tubes, are used to characterise the spatial and temporal variations in active‐layer thickness and to investigate linkages to climatic variations. Intra‐site variability in thaw depths is typically low where organic cover is thin and uniform. Higher variability occurs where moisture contents and organic cover are high and spatially variable. Grid‐mean thaw depths provide robust measures of the average site thaw depth, although they are less than annual maximum active‐layer thicknesses determined by thaw tubes. Values from both measurements correlate reasonably well, permitting estimates of the variations in active‐layer thickness from grid‐mean thaw depths. Active‐layer response to thermal forcing in various settings is well represented by grid‐mean thaw depths and the square‐root of late‐season thawing‐degree days. However, the effect of interannual climate variability on active‐layer thickness is better assessed by maximum tube thaw depths and the square‐root of total thawing‐degree days. Copyright © 2009 Her Majesty the Queen in right of Canada. Published by John Wiley & Sons, Ltd. Article in Journal/Newspaper Mackenzie Valley Northwest Territories Permafrost and Periglacial Processes Wiley Online Library Permafrost and Periglacial Processes 20 2 201 220 |
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Wiley Online Library |
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English |
description |
Abstract Summer thaw depths at eight monitoring sites in the Mackenzie Valley, determined from probing of grids and thaw tubes, are used to characterise the spatial and temporal variations in active‐layer thickness and to investigate linkages to climatic variations. Intra‐site variability in thaw depths is typically low where organic cover is thin and uniform. Higher variability occurs where moisture contents and organic cover are high and spatially variable. Grid‐mean thaw depths provide robust measures of the average site thaw depth, although they are less than annual maximum active‐layer thicknesses determined by thaw tubes. Values from both measurements correlate reasonably well, permitting estimates of the variations in active‐layer thickness from grid‐mean thaw depths. Active‐layer response to thermal forcing in various settings is well represented by grid‐mean thaw depths and the square‐root of late‐season thawing‐degree days. However, the effect of interannual climate variability on active‐layer thickness is better assessed by maximum tube thaw depths and the square‐root of total thawing‐degree days. Copyright © 2009 Her Majesty the Queen in right of Canada. Published by John Wiley & Sons, Ltd. |
format |
Article in Journal/Newspaper |
author |
Smith, Sharon L. Wolfe, Stephen A. Riseborough, Daniel W. Nixon, F. Mark |
spellingShingle |
Smith, Sharon L. Wolfe, Stephen A. Riseborough, Daniel W. Nixon, F. Mark Active‐layer characteristics and summer climatic indices, Mackenzie Valley, Northwest Territories, Canada |
author_facet |
Smith, Sharon L. Wolfe, Stephen A. Riseborough, Daniel W. Nixon, F. Mark |
author_sort |
Smith, Sharon L. |
title |
Active‐layer characteristics and summer climatic indices, Mackenzie Valley, Northwest Territories, Canada |
title_short |
Active‐layer characteristics and summer climatic indices, Mackenzie Valley, Northwest Territories, Canada |
title_full |
Active‐layer characteristics and summer climatic indices, Mackenzie Valley, Northwest Territories, Canada |
title_fullStr |
Active‐layer characteristics and summer climatic indices, Mackenzie Valley, Northwest Territories, Canada |
title_full_unstemmed |
Active‐layer characteristics and summer climatic indices, Mackenzie Valley, Northwest Territories, Canada |
title_sort |
active‐layer characteristics and summer climatic indices, mackenzie valley, northwest territories, canada |
publisher |
Wiley |
publishDate |
2009 |
url |
http://dx.doi.org/10.1002/ppp.651 https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.1002%2Fppp.651 https://onlinelibrary.wiley.com/doi/pdf/10.1002/ppp.651 |
genre |
Mackenzie Valley Northwest Territories Permafrost and Periglacial Processes |
genre_facet |
Mackenzie Valley Northwest Territories Permafrost and Periglacial Processes |
op_source |
Permafrost and Periglacial Processes volume 20, issue 2, page 201-220 ISSN 1045-6740 1099-1530 |
op_rights |
http://onlinelibrary.wiley.com/termsAndConditions#vor |
op_doi |
https://doi.org/10.1002/ppp.651 |
container_title |
Permafrost and Periglacial Processes |
container_volume |
20 |
container_issue |
2 |
container_start_page |
201 |
op_container_end_page |
220 |
_version_ |
1810456324895408128 |