Evidence of Anomalously Low δ13C of Marine Organic Matter in an Arctic Fjord
Accurate estimation of relative carbon deposition (marine vs. terrestrial) is required for understanding the global carbon budget, particularly in the Arctic region, which holds disproportionate importance with respect to global carbon cycling. Although the sedimentary organic matter (SOM) concentra...
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ftpubmed:oai:pubmedcentral.nih.gov:5101485 2023-05-15T14:46:40+02:00 Evidence of Anomalously Low δ13C of Marine Organic Matter in an Arctic Fjord Kumar, Vikash Tiwari, Manish Nagoji, Siddhesh Tripathi, Shubham 2016-11-09 http://www.ncbi.nlm.nih.gov/pmc/articles/PMC5101485/ http://www.ncbi.nlm.nih.gov/pubmed/27827457 https://doi.org/10.1038/srep36192 en eng Nature Publishing Group http://www.ncbi.nlm.nih.gov/pmc/articles/PMC5101485/ http://www.ncbi.nlm.nih.gov/pubmed/27827457 http://dx.doi.org/10.1038/srep36192 Copyright © 2016, The Author(s) http://creativecommons.org/licenses/by/4.0/ This work is licensed under a Creative Commons Attribution 4.0 International License. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in the credit line; if the material is not included under the Creative Commons license, users will need to obtain permission from the license holder to reproduce the material. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/ CC-BY Article Text 2016 ftpubmed https://doi.org/10.1038/srep36192 2016-11-20T01:11:41Z Accurate estimation of relative carbon deposition (marine vs. terrestrial) is required for understanding the global carbon budget, particularly in the Arctic region, which holds disproportionate importance with respect to global carbon cycling. Although the sedimentary organic matter (SOM) concentration and its isotopic composition are important tools for such calculations, uncertainties loom over estimates provided by organic-geochemical bulk parameters. We report carbon and nitrogen concentrations and isotopes (δ13C and δ15N) of SOM at an Arctic fjord namely Kongsfjorden. We find that the bound inorganic nitrogen (ammonium attached to the clay minerals) forms a significant proportion of total nitrogen concentration (~77% in the inner fjord to ~24% in the outer part). On removing the bound nitrogen, the C/N ratio shows that the SOM in the inner fjord is made up of terrestrial carbon while the outer fjord shows mixed marine-terrestrial signal. We further show that the marine organic matter is unusually more depleted in 13C (~−24‰) than the terrestrial organic matter (~−22.5‰). This particular finding also helps explain high δ13C values of SOM as noted by earlier studies in central Arctic sediments despite a high terrestrial contribution. Text Arctic Kongsfjord* Kongsfjorden PubMed Central (PMC) Arctic Scientific Reports 6 1 |
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Article Kumar, Vikash Tiwari, Manish Nagoji, Siddhesh Tripathi, Shubham Evidence of Anomalously Low δ13C of Marine Organic Matter in an Arctic Fjord |
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Accurate estimation of relative carbon deposition (marine vs. terrestrial) is required for understanding the global carbon budget, particularly in the Arctic region, which holds disproportionate importance with respect to global carbon cycling. Although the sedimentary organic matter (SOM) concentration and its isotopic composition are important tools for such calculations, uncertainties loom over estimates provided by organic-geochemical bulk parameters. We report carbon and nitrogen concentrations and isotopes (δ13C and δ15N) of SOM at an Arctic fjord namely Kongsfjorden. We find that the bound inorganic nitrogen (ammonium attached to the clay minerals) forms a significant proportion of total nitrogen concentration (~77% in the inner fjord to ~24% in the outer part). On removing the bound nitrogen, the C/N ratio shows that the SOM in the inner fjord is made up of terrestrial carbon while the outer fjord shows mixed marine-terrestrial signal. We further show that the marine organic matter is unusually more depleted in 13C (~−24‰) than the terrestrial organic matter (~−22.5‰). This particular finding also helps explain high δ13C values of SOM as noted by earlier studies in central Arctic sediments despite a high terrestrial contribution. |
format |
Text |
author |
Kumar, Vikash Tiwari, Manish Nagoji, Siddhesh Tripathi, Shubham |
author_facet |
Kumar, Vikash Tiwari, Manish Nagoji, Siddhesh Tripathi, Shubham |
author_sort |
Kumar, Vikash |
title |
Evidence of Anomalously Low δ13C of Marine Organic Matter in an Arctic Fjord |
title_short |
Evidence of Anomalously Low δ13C of Marine Organic Matter in an Arctic Fjord |
title_full |
Evidence of Anomalously Low δ13C of Marine Organic Matter in an Arctic Fjord |
title_fullStr |
Evidence of Anomalously Low δ13C of Marine Organic Matter in an Arctic Fjord |
title_full_unstemmed |
Evidence of Anomalously Low δ13C of Marine Organic Matter in an Arctic Fjord |
title_sort |
evidence of anomalously low δ13c of marine organic matter in an arctic fjord |
publisher |
Nature Publishing Group |
publishDate |
2016 |
url |
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC5101485/ http://www.ncbi.nlm.nih.gov/pubmed/27827457 https://doi.org/10.1038/srep36192 |
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Arctic |
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Arctic |
genre |
Arctic Kongsfjord* Kongsfjorden |
genre_facet |
Arctic Kongsfjord* Kongsfjorden |
op_relation |
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC5101485/ http://www.ncbi.nlm.nih.gov/pubmed/27827457 http://dx.doi.org/10.1038/srep36192 |
op_rights |
Copyright © 2016, The Author(s) http://creativecommons.org/licenses/by/4.0/ This work is licensed under a Creative Commons Attribution 4.0 International License. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in the credit line; if the material is not included under the Creative Commons license, users will need to obtain permission from the license holder to reproduce the material. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/ |
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CC-BY |
op_doi |
https://doi.org/10.1038/srep36192 |
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Scientific Reports |
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6 |
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1 |
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1766317871899607040 |