Temperature changes and thaw of permafrost adjacent to Richards Island, Mackenzie Delta, N.W.T.
Thawing of ice-bonded sediment below the sea floor accompanies sea-level rise and shoreline retreat along the Beaufort Sea coast. The rate of thaw is primarily controlled by the warm spring and summer discharge of the Mackenzie River, which affects sea-bottom temperatures to water depths of 10–20 m....
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1991
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Online Access: | http://dx.doi.org/10.1139/e91-163 http://www.nrcresearchpress.com/doi/pdf/10.1139/e91-163 |
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crcansciencepubl:10.1139/e91-163 2024-09-15T17:58:45+00:00 Temperature changes and thaw of permafrost adjacent to Richards Island, Mackenzie Delta, N.W.T. Dyke, Larry D. 1991 http://dx.doi.org/10.1139/e91-163 http://www.nrcresearchpress.com/doi/pdf/10.1139/e91-163 en eng Canadian Science Publishing http://www.nrcresearchpress.com/page/about/CorporateTextAndDataMining Canadian Journal of Earth Sciences volume 28, issue 11, page 1834-1842 ISSN 0008-4077 1480-3313 journal-article 1991 crcansciencepubl https://doi.org/10.1139/e91-163 2024-07-25T04:10:06Z Thawing of ice-bonded sediment below the sea floor accompanies sea-level rise and shoreline retreat along the Beaufort Sea coast. The rate of thaw is primarily controlled by the warm spring and summer discharge of the Mackenzie River, which affects sea-bottom temperatures to water depths of 10–20 m. The intensity of the warming at any one location decreases with depth until continuous sub-0 °C temperatures are encountered. Sea-level rise eventually brings the sea floor into the cold sea-water zone and thawing stops. Therefore thawing is also controlled by the residence time in the warm zone. Sedimentation or scouring can, respectively, slow or accelerate the increase in water depth and thereby modify the rate of thaw progression. This, combined with changes in the rate of coastal retreat, can produce a subbottom frost table with considerable relief. In the extreme, ice bonding within a few metres of the sea floor can be explained by accelerated submergence. Article in Journal/Newspaper Beaufort Sea Ice Mackenzie Delta Mackenzie river permafrost Richards Island Canadian Science Publishing Canadian Journal of Earth Sciences 28 11 1834 1842 |
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Open Polar |
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Canadian Science Publishing |
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crcansciencepubl |
language |
English |
description |
Thawing of ice-bonded sediment below the sea floor accompanies sea-level rise and shoreline retreat along the Beaufort Sea coast. The rate of thaw is primarily controlled by the warm spring and summer discharge of the Mackenzie River, which affects sea-bottom temperatures to water depths of 10–20 m. The intensity of the warming at any one location decreases with depth until continuous sub-0 °C temperatures are encountered. Sea-level rise eventually brings the sea floor into the cold sea-water zone and thawing stops. Therefore thawing is also controlled by the residence time in the warm zone. Sedimentation or scouring can, respectively, slow or accelerate the increase in water depth and thereby modify the rate of thaw progression. This, combined with changes in the rate of coastal retreat, can produce a subbottom frost table with considerable relief. In the extreme, ice bonding within a few metres of the sea floor can be explained by accelerated submergence. |
format |
Article in Journal/Newspaper |
author |
Dyke, Larry D. |
spellingShingle |
Dyke, Larry D. Temperature changes and thaw of permafrost adjacent to Richards Island, Mackenzie Delta, N.W.T. |
author_facet |
Dyke, Larry D. |
author_sort |
Dyke, Larry D. |
title |
Temperature changes and thaw of permafrost adjacent to Richards Island, Mackenzie Delta, N.W.T. |
title_short |
Temperature changes and thaw of permafrost adjacent to Richards Island, Mackenzie Delta, N.W.T. |
title_full |
Temperature changes and thaw of permafrost adjacent to Richards Island, Mackenzie Delta, N.W.T. |
title_fullStr |
Temperature changes and thaw of permafrost adjacent to Richards Island, Mackenzie Delta, N.W.T. |
title_full_unstemmed |
Temperature changes and thaw of permafrost adjacent to Richards Island, Mackenzie Delta, N.W.T. |
title_sort |
temperature changes and thaw of permafrost adjacent to richards island, mackenzie delta, n.w.t. |
publisher |
Canadian Science Publishing |
publishDate |
1991 |
url |
http://dx.doi.org/10.1139/e91-163 http://www.nrcresearchpress.com/doi/pdf/10.1139/e91-163 |
genre |
Beaufort Sea Ice Mackenzie Delta Mackenzie river permafrost Richards Island |
genre_facet |
Beaufort Sea Ice Mackenzie Delta Mackenzie river permafrost Richards Island |
op_source |
Canadian Journal of Earth Sciences volume 28, issue 11, page 1834-1842 ISSN 0008-4077 1480-3313 |
op_rights |
http://www.nrcresearchpress.com/page/about/CorporateTextAndDataMining |
op_doi |
https://doi.org/10.1139/e91-163 |
container_title |
Canadian Journal of Earth Sciences |
container_volume |
28 |
container_issue |
11 |
container_start_page |
1834 |
op_container_end_page |
1842 |
_version_ |
1810435600420962304 |