Increased petrogenic and biospheric organic carbon burial in sub‐Antarctic fjord sediments in response to recent glacier retreat
Fjords are recognized as hotspots of organic carbon (OC) burial in the coastal ocean. In fjords with glaciated catchments, glacier discharge carries large amounts of suspended matter. This sedimentary load includes OC from bedrock and terrigenous sources (modern vegetation, peat, soil deposits), whi...
Published in: | Limnology and Oceanography |
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2021
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Online Access: | https://doi.org/10.1002/lno.11965 http://resolver.sub.uni-goettingen.de/purl?gldocs-11858/9897 |
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ftsubggeo:oai:e-docs.geo-leo.de:11858/9897 2023-05-15T13:42:31+02:00 Increased petrogenic and biospheric organic carbon burial in sub‐Antarctic fjord sediments in response to recent glacier retreat Berg, Sonja Jivcov, Sandra Kusch, Stephanie Kuhn, Gerhard White, Duanne Bohrmann, Gerhard Melles, Martin Rethemeyer, Janet Jivcov, Sandra; 1 Institute of Geology and Mineralogy University of Cologne Cologne Germany Kusch, Stephanie; 2 CologneAMS—Centre for Accelerator Mass Spectrometry University of Cologne Cologne Germany Kuhn, Gerhard; 3 Alfred‐Wegener‐Institut Helmholtz Zentrum für Polar‐ und Meeresforschung Bremerhaven Germany White, Duanne; 4 Centre for Applied Water Science, Institute for Applied Ecology University of Canberra Canberra Australian Capital Territory Australia Bohrmann, Gerhard; 5 MARUM—Center for Marine Environmental Sciences and Department of Geosciences University of Bremen Bremen Germany Melles, Martin; 1 Institute of Geology and Mineralogy University of Cologne Cologne Germany Rethemeyer, Janet; 1 Institute of Geology and Mineralogy University of Cologne Cologne Germany 2021-10-28 https://doi.org/10.1002/lno.11965 http://resolver.sub.uni-goettingen.de/purl?gldocs-11858/9897 eng eng John Wiley & Sons, Inc. Hoboken, USA doi:10.1002/lno.11965 http://resolver.sub.uni-goettingen.de/purl?gldocs-11858/9897 This is an open access article under the terms of the Creative Commons Attribution‐NonCommercial License, which permits use, distribution and reproduction in any medium, provided the original work is properly cited and is not used for commercial purposes. CC-BY-NC ddc:552 ddc:551.9 South Georgia Cumberland Bay sub-Antarctic fjord sediments organic carbon burial doc-type:article 2021 ftsubggeo https://doi.org/10.1002/lno.11965 2022-11-09T06:51:42Z Fjords are recognized as hotspots of organic carbon (OC) burial in the coastal ocean. In fjords with glaciated catchments, glacier discharge carries large amounts of suspended matter. This sedimentary load includes OC from bedrock and terrigenous sources (modern vegetation, peat, soil deposits), which is either buried in the fjord or remineralized during export, acting as a potential source of CO2 to the atmosphere. In sub‐Antarctic South Georgia, fjord‐terminating glaciers have been retreating during the past decades, likely as a response to changing climate conditions. We determine sources of OC in surface sediments of Cumberland Bay, South Georgia, using lipid biomarkers and the bulk 14C isotopic composition, and quantify OC burial at present and for the time period of documented glacier retreat (between 1958 and 2017). Petrogenic OC is the dominant type of OC in proximity to the present‐day calving fronts (60.4 ± 1.4% to 73.8 ± 2.6%) and decreases to 14.0 ± 2.7% outside the fjord, indicating that petrogenic OC is effectively buried in the fjord. Beside of marine OC, terrigenous OC comprises 2.7 ± 0.5% to 7.9 ± 5.9% and is mostly derived from modern plants and Holocene peat and soil deposits that are eroded along the flanks of the fjord, rather than released by the retreating fjord glaciers. We estimate that the retreat of tidewater glaciers between 1958 and 2017 led to an increase in petrogenic carbon accumulation of 22% in Cumberland West Bay and 6.5% in Cumberland East Bay, suggesting that successive glacier retreat does not only release petrogenic OC into the fjord, but also increases the capacity of OC burial. Deutsche Forschungsgemeinschaft http://dx.doi.org/10.13039/501100001659 Article in Journal/Newspaper Antarc* Antarctic Tidewater GEO-LEOe-docs (FID GEO) Antarctic West Bay ENVELOPE(-36.584,-36.584,-54.237,-54.237) East Bay ENVELOPE(-36.426,-36.426,-54.288,-54.288) Cumberland Bay ENVELOPE(69.052,69.052,-48.781,-48.781) Cumberland East Bay ENVELOPE(-36.426,-36.426,-54.288,-54.288) Cumberland West Bay ENVELOPE(-36.584,-36.584,-54.237,-54.237) Limnology and Oceanography 66 12 4347 4362 |
institution |
Open Polar |
collection |
GEO-LEOe-docs (FID GEO) |
op_collection_id |
ftsubggeo |
language |
English |
topic |
ddc:552 ddc:551.9 South Georgia Cumberland Bay sub-Antarctic fjord sediments organic carbon burial |
spellingShingle |
ddc:552 ddc:551.9 South Georgia Cumberland Bay sub-Antarctic fjord sediments organic carbon burial Berg, Sonja Jivcov, Sandra Kusch, Stephanie Kuhn, Gerhard White, Duanne Bohrmann, Gerhard Melles, Martin Rethemeyer, Janet Jivcov, Sandra; 1 Institute of Geology and Mineralogy University of Cologne Cologne Germany Kusch, Stephanie; 2 CologneAMS—Centre for Accelerator Mass Spectrometry University of Cologne Cologne Germany Kuhn, Gerhard; 3 Alfred‐Wegener‐Institut Helmholtz Zentrum für Polar‐ und Meeresforschung Bremerhaven Germany White, Duanne; 4 Centre for Applied Water Science, Institute for Applied Ecology University of Canberra Canberra Australian Capital Territory Australia Bohrmann, Gerhard; 5 MARUM—Center for Marine Environmental Sciences and Department of Geosciences University of Bremen Bremen Germany Melles, Martin; 1 Institute of Geology and Mineralogy University of Cologne Cologne Germany Rethemeyer, Janet; 1 Institute of Geology and Mineralogy University of Cologne Cologne Germany Increased petrogenic and biospheric organic carbon burial in sub‐Antarctic fjord sediments in response to recent glacier retreat |
topic_facet |
ddc:552 ddc:551.9 South Georgia Cumberland Bay sub-Antarctic fjord sediments organic carbon burial |
description |
Fjords are recognized as hotspots of organic carbon (OC) burial in the coastal ocean. In fjords with glaciated catchments, glacier discharge carries large amounts of suspended matter. This sedimentary load includes OC from bedrock and terrigenous sources (modern vegetation, peat, soil deposits), which is either buried in the fjord or remineralized during export, acting as a potential source of CO2 to the atmosphere. In sub‐Antarctic South Georgia, fjord‐terminating glaciers have been retreating during the past decades, likely as a response to changing climate conditions. We determine sources of OC in surface sediments of Cumberland Bay, South Georgia, using lipid biomarkers and the bulk 14C isotopic composition, and quantify OC burial at present and for the time period of documented glacier retreat (between 1958 and 2017). Petrogenic OC is the dominant type of OC in proximity to the present‐day calving fronts (60.4 ± 1.4% to 73.8 ± 2.6%) and decreases to 14.0 ± 2.7% outside the fjord, indicating that petrogenic OC is effectively buried in the fjord. Beside of marine OC, terrigenous OC comprises 2.7 ± 0.5% to 7.9 ± 5.9% and is mostly derived from modern plants and Holocene peat and soil deposits that are eroded along the flanks of the fjord, rather than released by the retreating fjord glaciers. We estimate that the retreat of tidewater glaciers between 1958 and 2017 led to an increase in petrogenic carbon accumulation of 22% in Cumberland West Bay and 6.5% in Cumberland East Bay, suggesting that successive glacier retreat does not only release petrogenic OC into the fjord, but also increases the capacity of OC burial. Deutsche Forschungsgemeinschaft http://dx.doi.org/10.13039/501100001659 |
format |
Article in Journal/Newspaper |
author |
Berg, Sonja Jivcov, Sandra Kusch, Stephanie Kuhn, Gerhard White, Duanne Bohrmann, Gerhard Melles, Martin Rethemeyer, Janet Jivcov, Sandra; 1 Institute of Geology and Mineralogy University of Cologne Cologne Germany Kusch, Stephanie; 2 CologneAMS—Centre for Accelerator Mass Spectrometry University of Cologne Cologne Germany Kuhn, Gerhard; 3 Alfred‐Wegener‐Institut Helmholtz Zentrum für Polar‐ und Meeresforschung Bremerhaven Germany White, Duanne; 4 Centre for Applied Water Science, Institute for Applied Ecology University of Canberra Canberra Australian Capital Territory Australia Bohrmann, Gerhard; 5 MARUM—Center for Marine Environmental Sciences and Department of Geosciences University of Bremen Bremen Germany Melles, Martin; 1 Institute of Geology and Mineralogy University of Cologne Cologne Germany Rethemeyer, Janet; 1 Institute of Geology and Mineralogy University of Cologne Cologne Germany |
author_facet |
Berg, Sonja Jivcov, Sandra Kusch, Stephanie Kuhn, Gerhard White, Duanne Bohrmann, Gerhard Melles, Martin Rethemeyer, Janet Jivcov, Sandra; 1 Institute of Geology and Mineralogy University of Cologne Cologne Germany Kusch, Stephanie; 2 CologneAMS—Centre for Accelerator Mass Spectrometry University of Cologne Cologne Germany Kuhn, Gerhard; 3 Alfred‐Wegener‐Institut Helmholtz Zentrum für Polar‐ und Meeresforschung Bremerhaven Germany White, Duanne; 4 Centre for Applied Water Science, Institute for Applied Ecology University of Canberra Canberra Australian Capital Territory Australia Bohrmann, Gerhard; 5 MARUM—Center for Marine Environmental Sciences and Department of Geosciences University of Bremen Bremen Germany Melles, Martin; 1 Institute of Geology and Mineralogy University of Cologne Cologne Germany Rethemeyer, Janet; 1 Institute of Geology and Mineralogy University of Cologne Cologne Germany |
author_sort |
Berg, Sonja |
title |
Increased petrogenic and biospheric organic carbon burial in sub‐Antarctic fjord sediments in response to recent glacier retreat |
title_short |
Increased petrogenic and biospheric organic carbon burial in sub‐Antarctic fjord sediments in response to recent glacier retreat |
title_full |
Increased petrogenic and biospheric organic carbon burial in sub‐Antarctic fjord sediments in response to recent glacier retreat |
title_fullStr |
Increased petrogenic and biospheric organic carbon burial in sub‐Antarctic fjord sediments in response to recent glacier retreat |
title_full_unstemmed |
Increased petrogenic and biospheric organic carbon burial in sub‐Antarctic fjord sediments in response to recent glacier retreat |
title_sort |
increased petrogenic and biospheric organic carbon burial in sub‐antarctic fjord sediments in response to recent glacier retreat |
publisher |
John Wiley & Sons, Inc. |
publishDate |
2021 |
url |
https://doi.org/10.1002/lno.11965 http://resolver.sub.uni-goettingen.de/purl?gldocs-11858/9897 |
long_lat |
ENVELOPE(-36.584,-36.584,-54.237,-54.237) ENVELOPE(-36.426,-36.426,-54.288,-54.288) ENVELOPE(69.052,69.052,-48.781,-48.781) ENVELOPE(-36.426,-36.426,-54.288,-54.288) ENVELOPE(-36.584,-36.584,-54.237,-54.237) |
geographic |
Antarctic West Bay East Bay Cumberland Bay Cumberland East Bay Cumberland West Bay |
geographic_facet |
Antarctic West Bay East Bay Cumberland Bay Cumberland East Bay Cumberland West Bay |
genre |
Antarc* Antarctic Tidewater |
genre_facet |
Antarc* Antarctic Tidewater |
op_relation |
doi:10.1002/lno.11965 http://resolver.sub.uni-goettingen.de/purl?gldocs-11858/9897 |
op_rights |
This is an open access article under the terms of the Creative Commons Attribution‐NonCommercial License, which permits use, distribution and reproduction in any medium, provided the original work is properly cited and is not used for commercial purposes. |
op_rightsnorm |
CC-BY-NC |
op_doi |
https://doi.org/10.1002/lno.11965 |
container_title |
Limnology and Oceanography |
container_volume |
66 |
container_issue |
12 |
container_start_page |
4347 |
op_container_end_page |
4362 |
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1766168947029180416 |