Rapid seafloor changes associated with the degradation of Arctic submarine permafrost
Repeated high-resolution bathymetric surveys of the shelf edge of the Canadian Beaufort Sea during 2- to 9-y-long survey intervals reveal rapid morphological changes. New steep-sided depressions up to 28 m in depth developed, and lateral retreat along scarp faces occurred at multiple sites. These mo...
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ftpubmed:oai:pubmedcentral.nih.gov:8944826 2023-05-15T15:04:40+02:00 Rapid seafloor changes associated with the degradation of Arctic submarine permafrost Paull, Charles K. Dallimore, Scott R. Jin, Young Keun Caress, David W. Lundsten, Eve Gwiazda, Roberto Anderson, Krystle Hughes Clarke, John Youngblut, Scott Melling, Humfrey 2022-03-14 http://www.ncbi.nlm.nih.gov/pmc/articles/PMC8944826/ http://www.ncbi.nlm.nih.gov/pubmed/35286188 https://doi.org/10.1073/pnas.2119105119 en eng National Academy of Sciences http://www.ncbi.nlm.nih.gov/pmc/articles/PMC8944826/ http://www.ncbi.nlm.nih.gov/pubmed/35286188 http://dx.doi.org/10.1073/pnas.2119105119 Copyright © 2022 the Author(s). Published by PNAS. https://creativecommons.org/licenses/by-nc-nd/4.0/This open access article is distributed under Creative Commons Attribution-NonCommercial-NoDerivatives License 4.0 (CC BY-NC-ND) (https://creativecommons.org/licenses/by-nc-nd/4.0/) . CC-BY-NC-ND Proc Natl Acad Sci U S A Physical Sciences Text 2022 ftpubmed https://doi.org/10.1073/pnas.2119105119 2022-03-27T01:52:43Z Repeated high-resolution bathymetric surveys of the shelf edge of the Canadian Beaufort Sea during 2- to 9-y-long survey intervals reveal rapid morphological changes. New steep-sided depressions up to 28 m in depth developed, and lateral retreat along scarp faces occurred at multiple sites. These morphological changes appeared between 120-m and 150-m water depth, near the maximum limit of the submerged glacial-age permafrost, and are attributed to permafrost thawing where ascending groundwater is concentrated along the relict permafrost boundary. The groundwater is produced by the regional thawing of the permafrost base due to the shift in the geothermal gradient as a result of the interglacial transgression of the shelf. In contrast, where groundwater discharge is reduced, sediments freeze at the ambient sea bottom temperature of ∼−1.4 °C. The consequent expansion of freezing sediment creates ice-cored topographic highs or pingos, which are particularly abundant adjacent to the discharge area. Text Arctic Beaufort Sea Ice permafrost PubMed Central (PMC) Arctic Proceedings of the National Academy of Sciences 119 12 |
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PubMed Central (PMC) |
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language |
English |
topic |
Physical Sciences |
spellingShingle |
Physical Sciences Paull, Charles K. Dallimore, Scott R. Jin, Young Keun Caress, David W. Lundsten, Eve Gwiazda, Roberto Anderson, Krystle Hughes Clarke, John Youngblut, Scott Melling, Humfrey Rapid seafloor changes associated with the degradation of Arctic submarine permafrost |
topic_facet |
Physical Sciences |
description |
Repeated high-resolution bathymetric surveys of the shelf edge of the Canadian Beaufort Sea during 2- to 9-y-long survey intervals reveal rapid morphological changes. New steep-sided depressions up to 28 m in depth developed, and lateral retreat along scarp faces occurred at multiple sites. These morphological changes appeared between 120-m and 150-m water depth, near the maximum limit of the submerged glacial-age permafrost, and are attributed to permafrost thawing where ascending groundwater is concentrated along the relict permafrost boundary. The groundwater is produced by the regional thawing of the permafrost base due to the shift in the geothermal gradient as a result of the interglacial transgression of the shelf. In contrast, where groundwater discharge is reduced, sediments freeze at the ambient sea bottom temperature of ∼−1.4 °C. The consequent expansion of freezing sediment creates ice-cored topographic highs or pingos, which are particularly abundant adjacent to the discharge area. |
format |
Text |
author |
Paull, Charles K. Dallimore, Scott R. Jin, Young Keun Caress, David W. Lundsten, Eve Gwiazda, Roberto Anderson, Krystle Hughes Clarke, John Youngblut, Scott Melling, Humfrey |
author_facet |
Paull, Charles K. Dallimore, Scott R. Jin, Young Keun Caress, David W. Lundsten, Eve Gwiazda, Roberto Anderson, Krystle Hughes Clarke, John Youngblut, Scott Melling, Humfrey |
author_sort |
Paull, Charles K. |
title |
Rapid seafloor changes associated with the degradation of Arctic submarine permafrost |
title_short |
Rapid seafloor changes associated with the degradation of Arctic submarine permafrost |
title_full |
Rapid seafloor changes associated with the degradation of Arctic submarine permafrost |
title_fullStr |
Rapid seafloor changes associated with the degradation of Arctic submarine permafrost |
title_full_unstemmed |
Rapid seafloor changes associated with the degradation of Arctic submarine permafrost |
title_sort |
rapid seafloor changes associated with the degradation of arctic submarine permafrost |
publisher |
National Academy of Sciences |
publishDate |
2022 |
url |
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC8944826/ http://www.ncbi.nlm.nih.gov/pubmed/35286188 https://doi.org/10.1073/pnas.2119105119 |
geographic |
Arctic |
geographic_facet |
Arctic |
genre |
Arctic Beaufort Sea Ice permafrost |
genre_facet |
Arctic Beaufort Sea Ice permafrost |
op_source |
Proc Natl Acad Sci U S A |
op_relation |
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC8944826/ http://www.ncbi.nlm.nih.gov/pubmed/35286188 http://dx.doi.org/10.1073/pnas.2119105119 |
op_rights |
Copyright © 2022 the Author(s). Published by PNAS. https://creativecommons.org/licenses/by-nc-nd/4.0/This open access article is distributed under Creative Commons Attribution-NonCommercial-NoDerivatives License 4.0 (CC BY-NC-ND) (https://creativecommons.org/licenses/by-nc-nd/4.0/) . |
op_rightsnorm |
CC-BY-NC-ND |
op_doi |
https://doi.org/10.1073/pnas.2119105119 |
container_title |
Proceedings of the National Academy of Sciences |
container_volume |
119 |
container_issue |
12 |
_version_ |
1766336405146959872 |