Transformation of organic matter in a Barents Sea sediment profile:coupled geochemical and microbiological processes
Process-based, mechanistic investigations of organic matter transformation and diagenesis directly beneath the sediment–water interface (SWI) in Arctic continental shelves are vital as these regions are at greatest risk of future change. This is in part due to disruptions in benthic–pelagic coupling...
Published in: | Philosophical Transactions of the Royal Society A: Mathematical, Physical and Engineering Sciences |
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Main Authors: | , , , , , , , , , , , , , , |
Format: | Article in Journal/Newspaper |
Language: | English |
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Online Access: | https://hdl.handle.net/1983/75057d61-8d65-44b4-a600-43bce58305db https://research-information.bris.ac.uk/en/publications/75057d61-8d65-44b4-a600-43bce58305db https://doi.org/10.1098/rsta.2020.0223 https://research-information.bris.ac.uk/ws/files/243567385/Stevenson_et_al._2020_July_revisions_FINAL_SUBMIT.pdf |
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ftubristolcris:oai:research-information.bris.ac.uk:publications/75057d61-8d65-44b4-a600-43bce58305db 2024-04-28T08:11:05+00:00 Transformation of organic matter in a Barents Sea sediment profile:coupled geochemical and microbiological processes Stevenson, Mark Faust, Johan Sales De Freitas, Felipe Andrade, Luiza Grey, Neil Tait, Karen Hendry, Katharine Hilton, Robert Henley, Sian Tessin, Allyson Leary, Peter Papadaki, Sonia Ford, Ailbe Maerz, Christian Abbott, Geoffrey 2020-10-02 application/pdf https://hdl.handle.net/1983/75057d61-8d65-44b4-a600-43bce58305db https://research-information.bris.ac.uk/en/publications/75057d61-8d65-44b4-a600-43bce58305db https://doi.org/10.1098/rsta.2020.0223 https://research-information.bris.ac.uk/ws/files/243567385/Stevenson_et_al._2020_July_revisions_FINAL_SUBMIT.pdf eng eng https://research-information.bris.ac.uk/en/publications/75057d61-8d65-44b4-a600-43bce58305db info:eu-repo/semantics/openAccess Stevenson , M , Faust , J , Sales De Freitas , F , Andrade , L , Grey , N , Tait , K , Hendry , K , Hilton , R , Henley , S , Tessin , A , Leary , P , Papadaki , S , Ford , A , Maerz , C & Abbott , G 2020 , ' Transformation of organic matter in a Barents Sea sediment profile : coupled geochemical and microbiological processes ' , Philosophical Transactions of the Royal Society A: Physical and Engineering Sciences , vol. 378 , no. 2181 , 20200223 . https://doi.org/10.1098/rsta.2020.0223 Barents sea carbon cycling microbial processes geochemistry marine sediment organic matter reactivity article 2020 ftubristolcris https://doi.org/10.1098/rsta.2020.0223 2024-04-03T16:03:09Z Process-based, mechanistic investigations of organic matter transformation and diagenesis directly beneath the sediment–water interface (SWI) in Arctic continental shelves are vital as these regions are at greatest risk of future change. This is in part due to disruptions in benthic–pelagic coupling associated with ocean current change and sea ice retreat. Here, we focus on a high-resolution, multi-disciplinary set of measurements that illustrate how microbial processes involved in the degradation of organic matter are directly coupled with inorganic and organic geochemical sediment properties (measured and modelled) as well as the extent/depth of bioturbation. We find direct links between aerobic processes, reactive organic carbon and highest abundances of bacteria and archaea in the uppermost layer (0–4.5 cm depth) followed by dominance of microbes involved in nitrate/nitrite and iron/manganese reduction across the oxic-anoxic redox boundary (approx. 4.5–10.5 cm depth). Sulfate reducers dominate in the deeper (approx. 10.5–33 cm) anoxic sediments which is consistent with the modelled reactive transport framework. Importantly, organic matter reactivity as tracked by organic geochemical parameters (n-alkanes, n-alkanoic acids, n-alkanols and sterols) changes most dramatically at and directly below the SWI together with sedimentology and biological activity but remained relatively unchanged across deeper changes in sedimentology. Article in Journal/Newspaper Arctic Barents Sea Sea ice University of Bristol: Bristol Research Philosophical Transactions of the Royal Society A: Mathematical, Physical and Engineering Sciences 378 2181 20200223 |
institution |
Open Polar |
collection |
University of Bristol: Bristol Research |
op_collection_id |
ftubristolcris |
language |
English |
topic |
Barents sea carbon cycling microbial processes geochemistry marine sediment organic matter reactivity |
spellingShingle |
Barents sea carbon cycling microbial processes geochemistry marine sediment organic matter reactivity Stevenson, Mark Faust, Johan Sales De Freitas, Felipe Andrade, Luiza Grey, Neil Tait, Karen Hendry, Katharine Hilton, Robert Henley, Sian Tessin, Allyson Leary, Peter Papadaki, Sonia Ford, Ailbe Maerz, Christian Abbott, Geoffrey Transformation of organic matter in a Barents Sea sediment profile:coupled geochemical and microbiological processes |
topic_facet |
Barents sea carbon cycling microbial processes geochemistry marine sediment organic matter reactivity |
description |
Process-based, mechanistic investigations of organic matter transformation and diagenesis directly beneath the sediment–water interface (SWI) in Arctic continental shelves are vital as these regions are at greatest risk of future change. This is in part due to disruptions in benthic–pelagic coupling associated with ocean current change and sea ice retreat. Here, we focus on a high-resolution, multi-disciplinary set of measurements that illustrate how microbial processes involved in the degradation of organic matter are directly coupled with inorganic and organic geochemical sediment properties (measured and modelled) as well as the extent/depth of bioturbation. We find direct links between aerobic processes, reactive organic carbon and highest abundances of bacteria and archaea in the uppermost layer (0–4.5 cm depth) followed by dominance of microbes involved in nitrate/nitrite and iron/manganese reduction across the oxic-anoxic redox boundary (approx. 4.5–10.5 cm depth). Sulfate reducers dominate in the deeper (approx. 10.5–33 cm) anoxic sediments which is consistent with the modelled reactive transport framework. Importantly, organic matter reactivity as tracked by organic geochemical parameters (n-alkanes, n-alkanoic acids, n-alkanols and sterols) changes most dramatically at and directly below the SWI together with sedimentology and biological activity but remained relatively unchanged across deeper changes in sedimentology. |
format |
Article in Journal/Newspaper |
author |
Stevenson, Mark Faust, Johan Sales De Freitas, Felipe Andrade, Luiza Grey, Neil Tait, Karen Hendry, Katharine Hilton, Robert Henley, Sian Tessin, Allyson Leary, Peter Papadaki, Sonia Ford, Ailbe Maerz, Christian Abbott, Geoffrey |
author_facet |
Stevenson, Mark Faust, Johan Sales De Freitas, Felipe Andrade, Luiza Grey, Neil Tait, Karen Hendry, Katharine Hilton, Robert Henley, Sian Tessin, Allyson Leary, Peter Papadaki, Sonia Ford, Ailbe Maerz, Christian Abbott, Geoffrey |
author_sort |
Stevenson, Mark |
title |
Transformation of organic matter in a Barents Sea sediment profile:coupled geochemical and microbiological processes |
title_short |
Transformation of organic matter in a Barents Sea sediment profile:coupled geochemical and microbiological processes |
title_full |
Transformation of organic matter in a Barents Sea sediment profile:coupled geochemical and microbiological processes |
title_fullStr |
Transformation of organic matter in a Barents Sea sediment profile:coupled geochemical and microbiological processes |
title_full_unstemmed |
Transformation of organic matter in a Barents Sea sediment profile:coupled geochemical and microbiological processes |
title_sort |
transformation of organic matter in a barents sea sediment profile:coupled geochemical and microbiological processes |
publishDate |
2020 |
url |
https://hdl.handle.net/1983/75057d61-8d65-44b4-a600-43bce58305db https://research-information.bris.ac.uk/en/publications/75057d61-8d65-44b4-a600-43bce58305db https://doi.org/10.1098/rsta.2020.0223 https://research-information.bris.ac.uk/ws/files/243567385/Stevenson_et_al._2020_July_revisions_FINAL_SUBMIT.pdf |
genre |
Arctic Barents Sea Sea ice |
genre_facet |
Arctic Barents Sea Sea ice |
op_source |
Stevenson , M , Faust , J , Sales De Freitas , F , Andrade , L , Grey , N , Tait , K , Hendry , K , Hilton , R , Henley , S , Tessin , A , Leary , P , Papadaki , S , Ford , A , Maerz , C & Abbott , G 2020 , ' Transformation of organic matter in a Barents Sea sediment profile : coupled geochemical and microbiological processes ' , Philosophical Transactions of the Royal Society A: Physical and Engineering Sciences , vol. 378 , no. 2181 , 20200223 . https://doi.org/10.1098/rsta.2020.0223 |
op_relation |
https://research-information.bris.ac.uk/en/publications/75057d61-8d65-44b4-a600-43bce58305db |
op_rights |
info:eu-repo/semantics/openAccess |
op_doi |
https://doi.org/10.1098/rsta.2020.0223 |
container_title |
Philosophical Transactions of the Royal Society A: Mathematical, Physical and Engineering Sciences |
container_volume |
378 |
container_issue |
2181 |
container_start_page |
20200223 |
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1797578659262889984 |