Nearshore Zone Dynamics Determine Pathway of Organic Carbon From Eroding Permafrost Coasts
Collapse of permafrost coasts delivers large quantities of particulate organic carbon (POC) to Arctic coastal areas. With rapidly changing environmental conditions, sediment and organic carbon (OC) mobilization and transport pathways are also changing. Here, we assess the sources and sinks of POC in...
Published in: | Geophysical Research Letters |
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Online Access: | https://doi.org/10.1029/2020GL088561 |
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ftzenodo:oai:zenodo.org:4204381 2024-09-15T18:10:52+00:00 Nearshore Zone Dynamics Determine Pathway of Organic Carbon From Eroding Permafrost Coasts Jong, Dirk Bröder, Lisa Tanski, George Fritz, Michael Lantuit, Hugues Tesi, Tommaso Haghipour, Negar Eglinton, Timothy I. Vonk, Jorien E. 2020-07-17 https://doi.org/10.1029/2020GL088561 eng eng Zenodo https://zenodo.org/communities/nunataryuk https://doi.org/10.1029/2020GL088561 oai:zenodo.org:4204381 info:eu-repo/semantics/openAccess Creative Commons Attribution 4.0 International https://creativecommons.org/licenses/by/4.0/legalcode info:eu-repo/semantics/article 2020 ftzenodo https://doi.org/10.1029/2020GL088561 2024-07-26T23:25:07Z Collapse of permafrost coasts delivers large quantities of particulate organic carbon (POC) to Arctic coastal areas. With rapidly changing environmental conditions, sediment and organic carbon (OC) mobilization and transport pathways are also changing. Here, we assess the sources and sinks of POC in the highly dynamic nearshore zone of Herschel Island‐Qikiqtaruk (Yukon, Canada). Our results show that POC concentrations sharply decrease, from 15.9 to 0.3mgL−1, within the first 100–300m offshore. Simultaneously, radiocarbon ages of POC drop from 16,400 to 3,60014C years, indicating rapid settling of old permafrost POC to underlying sediments. This suggests that permafrost OC is, apart from a very narrow resuspension zone (<5m water depth), predominantly deposited in nearshore sediments. While long‐term storage of permafrost OC in marine sediments potentially limits biodegradation and its subsequent release as greenhouse gas, resuspension of fine‐grained, OC‐rich sediments in the nearshore zone potentially enhances OC turnover. Article in Journal/Newspaper Herschel Herschel Island permafrost Yukon Zenodo Geophysical Research Letters 47 15 |
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English |
description |
Collapse of permafrost coasts delivers large quantities of particulate organic carbon (POC) to Arctic coastal areas. With rapidly changing environmental conditions, sediment and organic carbon (OC) mobilization and transport pathways are also changing. Here, we assess the sources and sinks of POC in the highly dynamic nearshore zone of Herschel Island‐Qikiqtaruk (Yukon, Canada). Our results show that POC concentrations sharply decrease, from 15.9 to 0.3mgL−1, within the first 100–300m offshore. Simultaneously, radiocarbon ages of POC drop from 16,400 to 3,60014C years, indicating rapid settling of old permafrost POC to underlying sediments. This suggests that permafrost OC is, apart from a very narrow resuspension zone (<5m water depth), predominantly deposited in nearshore sediments. While long‐term storage of permafrost OC in marine sediments potentially limits biodegradation and its subsequent release as greenhouse gas, resuspension of fine‐grained, OC‐rich sediments in the nearshore zone potentially enhances OC turnover. |
format |
Article in Journal/Newspaper |
author |
Jong, Dirk Bröder, Lisa Tanski, George Fritz, Michael Lantuit, Hugues Tesi, Tommaso Haghipour, Negar Eglinton, Timothy I. Vonk, Jorien E. |
spellingShingle |
Jong, Dirk Bröder, Lisa Tanski, George Fritz, Michael Lantuit, Hugues Tesi, Tommaso Haghipour, Negar Eglinton, Timothy I. Vonk, Jorien E. Nearshore Zone Dynamics Determine Pathway of Organic Carbon From Eroding Permafrost Coasts |
author_facet |
Jong, Dirk Bröder, Lisa Tanski, George Fritz, Michael Lantuit, Hugues Tesi, Tommaso Haghipour, Negar Eglinton, Timothy I. Vonk, Jorien E. |
author_sort |
Jong, Dirk |
title |
Nearshore Zone Dynamics Determine Pathway of Organic Carbon From Eroding Permafrost Coasts |
title_short |
Nearshore Zone Dynamics Determine Pathway of Organic Carbon From Eroding Permafrost Coasts |
title_full |
Nearshore Zone Dynamics Determine Pathway of Organic Carbon From Eroding Permafrost Coasts |
title_fullStr |
Nearshore Zone Dynamics Determine Pathway of Organic Carbon From Eroding Permafrost Coasts |
title_full_unstemmed |
Nearshore Zone Dynamics Determine Pathway of Organic Carbon From Eroding Permafrost Coasts |
title_sort |
nearshore zone dynamics determine pathway of organic carbon from eroding permafrost coasts |
publisher |
Zenodo |
publishDate |
2020 |
url |
https://doi.org/10.1029/2020GL088561 |
genre |
Herschel Herschel Island permafrost Yukon |
genre_facet |
Herschel Herschel Island permafrost Yukon |
op_relation |
https://zenodo.org/communities/nunataryuk https://doi.org/10.1029/2020GL088561 oai:zenodo.org:4204381 |
op_rights |
info:eu-repo/semantics/openAccess Creative Commons Attribution 4.0 International https://creativecommons.org/licenses/by/4.0/legalcode |
op_doi |
https://doi.org/10.1029/2020GL088561 |
container_title |
Geophysical Research Letters |
container_volume |
47 |
container_issue |
15 |
_version_ |
1810448451622666240 |