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...
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Online Access: | http://www.ncbi.nlm.nih.gov/pmc/articles/PMC7507779/ http://www.ncbi.nlm.nih.gov/pubmed/32999517 https://doi.org/10.1029/2020GL088561 |
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ftpubmed:oai:pubmedcentral.nih.gov:7507779 2023-05-15T15:04:10+02:00 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. 2020-07-31 http://www.ncbi.nlm.nih.gov/pmc/articles/PMC7507779/ http://www.ncbi.nlm.nih.gov/pubmed/32999517 https://doi.org/10.1029/2020GL088561 en eng John Wiley and Sons Inc. http://www.ncbi.nlm.nih.gov/pmc/articles/PMC7507779/ http://www.ncbi.nlm.nih.gov/pubmed/32999517 http://dx.doi.org/10.1029/2020GL088561 ©2020. The Authors. This is an open access article under the terms of the http://creativecommons.org/licenses/by/4.0/ License, which permits use, distribution and reproduction in any medium, provided the original work is properly cited. CC-BY Geophys Res Lett Research Letters Text 2020 ftpubmed https://doi.org/10.1029/2020GL088561 2020-10-04T00:42:57Z 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 0.3 mg L(−1), within the first 100–300 m offshore. Simultaneously, radiocarbon ages of POC drop from 16,400 to 3,600 (14)C years, indicating rapid settling of old permafrost POC to underlying sediments. This suggests that permafrost OC is, apart from a very narrow resuspension zone (<5 m 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. Text Arctic Herschel Herschel Island permafrost Yukon PubMed Central (PMC) Arctic Canada Herschel Island ENVELOPE(-139.089,-139.089,69.583,69.583) Yukon Geophysical Research Letters 47 15 |
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English |
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Research Letters |
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Research Letters 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 |
topic_facet |
Research Letters |
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 0.3 mg L(−1), within the first 100–300 m offshore. Simultaneously, radiocarbon ages of POC drop from 16,400 to 3,600 (14)C years, indicating rapid settling of old permafrost POC to underlying sediments. This suggests that permafrost OC is, apart from a very narrow resuspension zone (<5 m 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 |
Text |
author |
Jong, Dirk Bröder, Lisa Tanski, George Fritz, Michael Lantuit, Hugues Tesi, Tommaso Haghipour, Negar Eglinton, Timothy I. Vonk, Jorien E. |
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 |
John Wiley and Sons Inc. |
publishDate |
2020 |
url |
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC7507779/ http://www.ncbi.nlm.nih.gov/pubmed/32999517 https://doi.org/10.1029/2020GL088561 |
long_lat |
ENVELOPE(-139.089,-139.089,69.583,69.583) |
geographic |
Arctic Canada Herschel Island Yukon |
geographic_facet |
Arctic Canada Herschel Island Yukon |
genre |
Arctic Herschel Herschel Island permafrost Yukon |
genre_facet |
Arctic Herschel Herschel Island permafrost Yukon |
op_source |
Geophys Res Lett |
op_relation |
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC7507779/ http://www.ncbi.nlm.nih.gov/pubmed/32999517 http://dx.doi.org/10.1029/2020GL088561 |
op_rights |
©2020. The Authors. This is an open access article under the terms of the http://creativecommons.org/licenses/by/4.0/ License, which permits use, distribution and reproduction in any medium, provided the original work is properly cited. |
op_rightsnorm |
CC-BY |
op_doi |
https://doi.org/10.1029/2020GL088561 |
container_title |
Geophysical Research Letters |
container_volume |
47 |
container_issue |
15 |
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1766335991477436416 |