Permafrost carbon and CO2 pathways differ at contrasting coastal erosion sites in the Canadian Arctic
Warming air and sea temperatures, longer open-water seasons and sea-level rise promote the erosion of permafrost coasts in the Arctic, which profoundly impacts organic matter pathways. Although estimates on organic carbon (OC) fluxes from erosion exist for some parts of the Arctic, little is known a...
Published in: | Frontiers in Earth Science |
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2021
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Online Access: | https://epic.awi.de/id/eprint/53774/ https://epic.awi.de/id/eprint/53774/1/Tanski_2021_feart-09-630493.pdf https://doi.org/10.3389/feart.2021.630493 https://hdl.handle.net/10013/epic.c4786d5c-dbb1-4b25-b61b-5f9313fa3964 |
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ftawi:oai:epic.awi.de:53774 2024-05-19T07:33:30+00:00 Permafrost carbon and CO2 pathways differ at contrasting coastal erosion sites in the Canadian Arctic Tanski, George Bröder, Lisa Wagner, Dirk Knoblauch, Christian Lantuit, Hugues Beer, Christian Sachs, Torsten Fritz, Michael Tesi, Tommaso Koch, Boris Haghipour, Negar Eglinton, TI Strauss, Jens Vonk, Jorien E 2021 application/pdf https://epic.awi.de/id/eprint/53774/ https://epic.awi.de/id/eprint/53774/1/Tanski_2021_feart-09-630493.pdf https://doi.org/10.3389/feart.2021.630493 https://hdl.handle.net/10013/epic.c4786d5c-dbb1-4b25-b61b-5f9313fa3964 unknown https://epic.awi.de/id/eprint/53774/1/Tanski_2021_feart-09-630493.pdf Tanski, G. , Bröder, L. , Wagner, D. , Knoblauch, C. , Lantuit, H. orcid:0000-0003-1497-6760 , Beer, C. , Sachs, T. , Fritz, M. orcid:0000-0003-4591-7325 , Tesi, T. , Koch, B. orcid:0000-0002-8453-731X , Haghipour, N. , Eglinton, T. , Strauss, J. orcid:0000-0003-4678-4982 and Vonk, J. E. (2021) Permafrost carbon and CO2 pathways differ at contrasting coastal erosion sites in the Canadian Arctic , Frontiers in Earth Science . doi:10.3389/feart.2021.630493 <https://doi.org/10.3389/feart.2021.630493> , hdl:10013/epic.c4786d5c-dbb1-4b25-b61b-5f9313fa3964 info:eu-repo/semantics/openAccess EPIC3Frontiers in Earth Science Article isiRev info:eu-repo/semantics/article 2021 ftawi https://doi.org/10.3389/feart.2021.630493 2024-04-23T23:38:07Z Warming air and sea temperatures, longer open-water seasons and sea-level rise promote the erosion of permafrost coasts in the Arctic, which profoundly impacts organic matter pathways. Although estimates on organic carbon (OC) fluxes from erosion exist for some parts of the Arctic, little is known about how much OC is transformed into greenhouse gases (GHGs). In this study we investigated two different coastal erosion scenarios on Qikiqtaruk – Herschel Island (Canada) and estimate the potential for GHG formation. We distinguished between a delayed release represented by mud debris draining a coastal thermoerosional feature and a direct release represented by cliff debris at a low collapsing bluff. Carbon dioxide (CO2) production was measured during incubations at 4 °C under aerobic conditions for two months and were modelled for four months and a full year. Our incubation results show that mud debris and cliff debris lost a considerable amount of OC as CO2 (2.5 ± 0.2 and 1.6 ± 0.3% of OC, respectively). Although relative OC losses were highest in mineral mud debris, higher initial OC content and fresh organic matter in cliff debris resulted in a ~three times higher cumulative CO2 release (4.0 ± 0.9 compared to 1.4 ± 0.1 mg CO2 gdw-1), which was further increased by the addition of seawater. After four months, modelled OC losses were 4.9 ± 0.1 and 3.2 ± 0.3% in set-ups without seawater and 14.3 ± 0.1 and 7.3 ± 0.8% in set-ups with seawater. The results indicate that a delayed release may support substantial cycling of OC at relatively low CO2 production rates during long transit times onshore during the Arctic warm season. By contrast, direct erosion may result in a single CO2 pulse and less substantial OC cycling onshore as transfer times are short. Once eroded sediments are deposited in the nearshore, highest OC losses can be expected. We conclude that the release of CO2 from eroding permafrost coasts varies considerably between erosion types and residence time onshore. We emphasize the importance of a more ... Article in Journal/Newspaper Arctic Arctic Herschel Island permafrost Alfred Wegener Institute for Polar- and Marine Research (AWI): ePIC (electronic Publication Information Center) Frontiers in Earth Science 9 |
institution |
Open Polar |
collection |
Alfred Wegener Institute for Polar- and Marine Research (AWI): ePIC (electronic Publication Information Center) |
op_collection_id |
ftawi |
language |
unknown |
description |
Warming air and sea temperatures, longer open-water seasons and sea-level rise promote the erosion of permafrost coasts in the Arctic, which profoundly impacts organic matter pathways. Although estimates on organic carbon (OC) fluxes from erosion exist for some parts of the Arctic, little is known about how much OC is transformed into greenhouse gases (GHGs). In this study we investigated two different coastal erosion scenarios on Qikiqtaruk – Herschel Island (Canada) and estimate the potential for GHG formation. We distinguished between a delayed release represented by mud debris draining a coastal thermoerosional feature and a direct release represented by cliff debris at a low collapsing bluff. Carbon dioxide (CO2) production was measured during incubations at 4 °C under aerobic conditions for two months and were modelled for four months and a full year. Our incubation results show that mud debris and cliff debris lost a considerable amount of OC as CO2 (2.5 ± 0.2 and 1.6 ± 0.3% of OC, respectively). Although relative OC losses were highest in mineral mud debris, higher initial OC content and fresh organic matter in cliff debris resulted in a ~three times higher cumulative CO2 release (4.0 ± 0.9 compared to 1.4 ± 0.1 mg CO2 gdw-1), which was further increased by the addition of seawater. After four months, modelled OC losses were 4.9 ± 0.1 and 3.2 ± 0.3% in set-ups without seawater and 14.3 ± 0.1 and 7.3 ± 0.8% in set-ups with seawater. The results indicate that a delayed release may support substantial cycling of OC at relatively low CO2 production rates during long transit times onshore during the Arctic warm season. By contrast, direct erosion may result in a single CO2 pulse and less substantial OC cycling onshore as transfer times are short. Once eroded sediments are deposited in the nearshore, highest OC losses can be expected. We conclude that the release of CO2 from eroding permafrost coasts varies considerably between erosion types and residence time onshore. We emphasize the importance of a more ... |
format |
Article in Journal/Newspaper |
author |
Tanski, George Bröder, Lisa Wagner, Dirk Knoblauch, Christian Lantuit, Hugues Beer, Christian Sachs, Torsten Fritz, Michael Tesi, Tommaso Koch, Boris Haghipour, Negar Eglinton, TI Strauss, Jens Vonk, Jorien E |
spellingShingle |
Tanski, George Bröder, Lisa Wagner, Dirk Knoblauch, Christian Lantuit, Hugues Beer, Christian Sachs, Torsten Fritz, Michael Tesi, Tommaso Koch, Boris Haghipour, Negar Eglinton, TI Strauss, Jens Vonk, Jorien E Permafrost carbon and CO2 pathways differ at contrasting coastal erosion sites in the Canadian Arctic |
author_facet |
Tanski, George Bröder, Lisa Wagner, Dirk Knoblauch, Christian Lantuit, Hugues Beer, Christian Sachs, Torsten Fritz, Michael Tesi, Tommaso Koch, Boris Haghipour, Negar Eglinton, TI Strauss, Jens Vonk, Jorien E |
author_sort |
Tanski, George |
title |
Permafrost carbon and CO2 pathways differ at contrasting coastal erosion sites in the Canadian Arctic |
title_short |
Permafrost carbon and CO2 pathways differ at contrasting coastal erosion sites in the Canadian Arctic |
title_full |
Permafrost carbon and CO2 pathways differ at contrasting coastal erosion sites in the Canadian Arctic |
title_fullStr |
Permafrost carbon and CO2 pathways differ at contrasting coastal erosion sites in the Canadian Arctic |
title_full_unstemmed |
Permafrost carbon and CO2 pathways differ at contrasting coastal erosion sites in the Canadian Arctic |
title_sort |
permafrost carbon and co2 pathways differ at contrasting coastal erosion sites in the canadian arctic |
publishDate |
2021 |
url |
https://epic.awi.de/id/eprint/53774/ https://epic.awi.de/id/eprint/53774/1/Tanski_2021_feart-09-630493.pdf https://doi.org/10.3389/feart.2021.630493 https://hdl.handle.net/10013/epic.c4786d5c-dbb1-4b25-b61b-5f9313fa3964 |
genre |
Arctic Arctic Herschel Island permafrost |
genre_facet |
Arctic Arctic Herschel Island permafrost |
op_source |
EPIC3Frontiers in Earth Science |
op_relation |
https://epic.awi.de/id/eprint/53774/1/Tanski_2021_feart-09-630493.pdf Tanski, G. , Bröder, L. , Wagner, D. , Knoblauch, C. , Lantuit, H. orcid:0000-0003-1497-6760 , Beer, C. , Sachs, T. , Fritz, M. orcid:0000-0003-4591-7325 , Tesi, T. , Koch, B. orcid:0000-0002-8453-731X , Haghipour, N. , Eglinton, T. , Strauss, J. orcid:0000-0003-4678-4982 and Vonk, J. E. (2021) Permafrost carbon and CO2 pathways differ at contrasting coastal erosion sites in the Canadian Arctic , Frontiers in Earth Science . doi:10.3389/feart.2021.630493 <https://doi.org/10.3389/feart.2021.630493> , hdl:10013/epic.c4786d5c-dbb1-4b25-b61b-5f9313fa3964 |
op_rights |
info:eu-repo/semantics/openAccess |
op_doi |
https://doi.org/10.3389/feart.2021.630493 |
container_title |
Frontiers in Earth Science |
container_volume |
9 |
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1799471584776290304 |