Burial and origin of permafrost organic carbon in the Arctic nearshore zone
Increasing air and sea surface temperatures at high latitudes lead to accelerated thaw, destabilization, and erosion of perennially frozen soils (i.e., permafrost), which are often rich in organic carbon. Coastal erosion leads to an increased mobilization of organic carbon into the Arctic Ocean that...
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ftawi:oai:epic.awi.de:52038 2023-07-16T03:55:38+02:00 Burial and origin of permafrost organic carbon in the Arctic nearshore zone Fritz, Michael Grotheer, Hendrik Meyer, Vera Riedel, Thorsten Pfalz, Gregor Mathieu, L. Hefter, Jens Gentz, Torben Lantuit, Hugues Mollenhauer, Gesine 2020-05-08 https://epic.awi.de/id/eprint/52038/ https://hdl.handle.net/10013/epic.4c79aecc-a800-4b8f-9343-499ca53b98e2 unknown Fritz, M. orcid:0000-0003-4591-7325 , Grotheer, H. orcid:0000-0003-0207-3767 , Meyer, V. orcid:0000-0002-4958-5367 , Riedel, T. , Pfalz, G. orcid:0000-0003-1218-177X , Mathieu, L. , Hefter, J. orcid:0000-0002-5823-1966 , Gentz, T. orcid:0000-0001-6739-5359 , Lantuit, H. orcid:0000-0003-1497-6760 and Mollenhauer, G. orcid:0000-0001-5138-564X (2020) Burial and origin of permafrost organic carbon in the Arctic nearshore zone , European Geosciences Union General Assembly, Vienna, Austria, 4 May 2020 - 8 May 2020 . doi:10.5194/egusphere-egu2020-4244 <https://doi.org/10.5194/egusphere-egu2020-4244> , hdl:10013/epic.4c79aecc-a800-4b8f-9343-499ca53b98e2 EPIC3European Geosciences Union General Assembly, Vienna, Austria, 2020-05-04-2020-05-08 Conference notRev 2020 ftawi https://doi.org/10.5194/egusphere-egu2020-4244 2023-06-25T23:19:51Z Increasing air and sea surface temperatures at high latitudes lead to accelerated thaw, destabilization, and erosion of perennially frozen soils (i.e., permafrost), which are often rich in organic carbon. Coastal erosion leads to an increased mobilization of organic carbon into the Arctic Ocean that can be converted into greenhouse gases and may therefore contribute to further warming. Carbon decomposition can be limited if organic matter is efficiently deposited on the seafloor, buried in marine sediments and thus removed from the short-term carbon cycle. Basins, canyons and troughs near the coastline can serve as sediment traps and potentially accommodate large quantities of organic carbon along the Arctic coast. Here we use biomarkers (source-specific molecules), stable carbon isotopes (δ13C) and radiocarbon (Δ14C) to identify the sources of organic carbon in the nearshore zone of the southern Canadian Beaufort Sea. We use an end-member model based on the carbon isotopic composition of bulk organic matter to identify sources of organic carbon. Monte Carlo simulations are applied to quantify the contribution of coastal permafrost erosion to the sedimentary carbon budget. The models suggest that 40% of all carbon released by coastal erosion is efficiently trapped and sequestered in the nearshore zone. We conclude that permafrost coastal erosion releases huge amounts of sediment and organic matter into the nearshore zone. Rapid burial removes large quantities of carbon from the carbon cycle in depositional settings. Conference Object Arctic Arctic Arctic Ocean Beaufort Sea permafrost Alfred Wegener Institute for Polar- and Marine Research (AWI): ePIC (electronic Publication Information Center) Arctic Arctic Ocean Quaternary Science Reviews 264 107022 |
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Alfred Wegener Institute for Polar- and Marine Research (AWI): ePIC (electronic Publication Information Center) |
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ftawi |
language |
unknown |
description |
Increasing air and sea surface temperatures at high latitudes lead to accelerated thaw, destabilization, and erosion of perennially frozen soils (i.e., permafrost), which are often rich in organic carbon. Coastal erosion leads to an increased mobilization of organic carbon into the Arctic Ocean that can be converted into greenhouse gases and may therefore contribute to further warming. Carbon decomposition can be limited if organic matter is efficiently deposited on the seafloor, buried in marine sediments and thus removed from the short-term carbon cycle. Basins, canyons and troughs near the coastline can serve as sediment traps and potentially accommodate large quantities of organic carbon along the Arctic coast. Here we use biomarkers (source-specific molecules), stable carbon isotopes (δ13C) and radiocarbon (Δ14C) to identify the sources of organic carbon in the nearshore zone of the southern Canadian Beaufort Sea. We use an end-member model based on the carbon isotopic composition of bulk organic matter to identify sources of organic carbon. Monte Carlo simulations are applied to quantify the contribution of coastal permafrost erosion to the sedimentary carbon budget. The models suggest that 40% of all carbon released by coastal erosion is efficiently trapped and sequestered in the nearshore zone. We conclude that permafrost coastal erosion releases huge amounts of sediment and organic matter into the nearshore zone. Rapid burial removes large quantities of carbon from the carbon cycle in depositional settings. |
format |
Conference Object |
author |
Fritz, Michael Grotheer, Hendrik Meyer, Vera Riedel, Thorsten Pfalz, Gregor Mathieu, L. Hefter, Jens Gentz, Torben Lantuit, Hugues Mollenhauer, Gesine |
spellingShingle |
Fritz, Michael Grotheer, Hendrik Meyer, Vera Riedel, Thorsten Pfalz, Gregor Mathieu, L. Hefter, Jens Gentz, Torben Lantuit, Hugues Mollenhauer, Gesine Burial and origin of permafrost organic carbon in the Arctic nearshore zone |
author_facet |
Fritz, Michael Grotheer, Hendrik Meyer, Vera Riedel, Thorsten Pfalz, Gregor Mathieu, L. Hefter, Jens Gentz, Torben Lantuit, Hugues Mollenhauer, Gesine |
author_sort |
Fritz, Michael |
title |
Burial and origin of permafrost organic carbon in the Arctic nearshore zone |
title_short |
Burial and origin of permafrost organic carbon in the Arctic nearshore zone |
title_full |
Burial and origin of permafrost organic carbon in the Arctic nearshore zone |
title_fullStr |
Burial and origin of permafrost organic carbon in the Arctic nearshore zone |
title_full_unstemmed |
Burial and origin of permafrost organic carbon in the Arctic nearshore zone |
title_sort |
burial and origin of permafrost organic carbon in the arctic nearshore zone |
publishDate |
2020 |
url |
https://epic.awi.de/id/eprint/52038/ https://hdl.handle.net/10013/epic.4c79aecc-a800-4b8f-9343-499ca53b98e2 |
geographic |
Arctic Arctic Ocean |
geographic_facet |
Arctic Arctic Ocean |
genre |
Arctic Arctic Arctic Ocean Beaufort Sea permafrost |
genre_facet |
Arctic Arctic Arctic Ocean Beaufort Sea permafrost |
op_source |
EPIC3European Geosciences Union General Assembly, Vienna, Austria, 2020-05-04-2020-05-08 |
op_relation |
Fritz, M. orcid:0000-0003-4591-7325 , Grotheer, H. orcid:0000-0003-0207-3767 , Meyer, V. orcid:0000-0002-4958-5367 , Riedel, T. , Pfalz, G. orcid:0000-0003-1218-177X , Mathieu, L. , Hefter, J. orcid:0000-0002-5823-1966 , Gentz, T. orcid:0000-0001-6739-5359 , Lantuit, H. orcid:0000-0003-1497-6760 and Mollenhauer, G. orcid:0000-0001-5138-564X (2020) Burial and origin of permafrost organic carbon in the Arctic nearshore zone , European Geosciences Union General Assembly, Vienna, Austria, 4 May 2020 - 8 May 2020 . doi:10.5194/egusphere-egu2020-4244 <https://doi.org/10.5194/egusphere-egu2020-4244> , hdl:10013/epic.4c79aecc-a800-4b8f-9343-499ca53b98e2 |
op_doi |
https://doi.org/10.5194/egusphere-egu2020-4244 |
container_title |
Quaternary Science Reviews |
container_volume |
264 |
container_start_page |
107022 |
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1771541812575469568 |