Active‐layer characteristics and summer climatic indices, Mackenzie Valley, Northwest Territories, Canada
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 t...
Published in: | Permafrost and Periglacial Processes |
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Language: | unknown |
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Online Access: | https://doi.org/10.1002/ppp.651 |
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ftrepec:oai:RePEc:wly:perpro:v:20:y:2009:i:2:p:201-220 2023-05-15T17:09:43+02:00 Active‐layer characteristics and summer climatic indices, Mackenzie Valley, Northwest Territories, Canada Sharon L. Smith Stephen A. Wolfe Daniel W. Riseborough F. Mark Nixon https://doi.org/10.1002/ppp.651 unknown https://doi.org/10.1002/ppp.651 article ftrepec https://doi.org/10.1002/ppp.651 2020-12-04T13:31:03Z 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 RePEc (Research Papers in Economics) Northwest Territories Canada Mackenzie Valley ENVELOPE(-126.070,-126.070,52.666,52.666) Permafrost and Periglacial Processes 20 2 201 220 |
institution |
Open Polar |
collection |
RePEc (Research Papers in Economics) |
op_collection_id |
ftrepec |
language |
unknown |
description |
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 |
Sharon L. Smith Stephen A. Wolfe Daniel W. Riseborough F. Mark Nixon |
spellingShingle |
Sharon L. Smith Stephen A. Wolfe Daniel W. Riseborough F. Mark Nixon Active‐layer characteristics and summer climatic indices, Mackenzie Valley, Northwest Territories, Canada |
author_facet |
Sharon L. Smith Stephen A. Wolfe Daniel W. Riseborough F. Mark Nixon |
author_sort |
Sharon L. Smith |
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 |
url |
https://doi.org/10.1002/ppp.651 |
long_lat |
ENVELOPE(-126.070,-126.070,52.666,52.666) |
geographic |
Northwest Territories Canada Mackenzie Valley |
geographic_facet |
Northwest Territories Canada Mackenzie Valley |
genre |
Mackenzie Valley Northwest Territories |
genre_facet |
Mackenzie Valley Northwest Territories |
op_relation |
https://doi.org/10.1002/ppp.651 |
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_ |
1766065874578440192 |