Sedimentary nutrient supply in productive hot spots off the West Antarctic peninsula revealed by silicon isotopes
In this study we evaluate the benthic fluxes of silicic acid along the West Antarctic Peninsula (WAP). Silicic acid (DSi) is one of the macronutrients essential in fuelling biological hot spots of diatom‐dominated primary production along the WAP. Here we measure the concentration and stable silicon...
Published in: | Global Biogeochemical Cycles |
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ftnerc:oai:nora.nerc.ac.uk:529359 2023-05-15T13:41:45+02:00 Sedimentary nutrient supply in productive hot spots off the West Antarctic peninsula revealed by silicon isotopes Cassarino, Lucie Hendry, Katharine R. Henley, Sian F. MacDonald, Ellen Arndt, Sandra Freitas, Felipe S. Pike, Jennifer Firing, Yvonne L. 2020-12-21 text http://nora.nerc.ac.uk/id/eprint/529359/ https://nora.nerc.ac.uk/id/eprint/529359/1/2019GB006486.pdf https://doi.org/10.1029/2019GB006486 en eng https://nora.nerc.ac.uk/id/eprint/529359/1/2019GB006486.pdf Cassarino, Lucie; Hendry, Katharine R.; Henley, Sian F.; MacDonald, Ellen; Arndt, Sandra; Freitas, Felipe S.; Pike, Jennifer; Firing, Yvonne L. orcid:0000-0002-3640-3974 . 2020 Sedimentary nutrient supply in productive hot spots off the West Antarctic peninsula revealed by silicon isotopes. Global Biogeochemical Cycles, 34 (12), e2019GB006486. https://doi.org/10.1029/2019GB006486 <https://doi.org/10.1029/2019GB006486> cc_by_4 CC-BY Publication - Article PeerReviewed 2020 ftnerc https://doi.org/10.1029/2019GB006486 2023-02-04T19:51:34Z In this study we evaluate the benthic fluxes of silicic acid along the West Antarctic Peninsula (WAP). Silicic acid (DSi) is one of the macronutrients essential in fuelling biological hot spots of diatom‐dominated primary production along the WAP. Here we measure the concentration and stable silicon isotopic composition of DSi in porewater profiles, biogenic silica content (BSi), and diatom abundance from sediment cores collected along the WAP. We couple these measurements with reaction‐transport modeling, to assess the DSi flux and the processes that release this key nutrient from the sediment into the overlying waters. Our results show that the benthic DSi flux is dominated by the diffusive flux, which is estimated to be equivalent to 26.7 ± 2.7 Gmol yr−1 for the WAP continental shelf. The DSi isotope profiles reveal the important impact of sedimentary processes on porewater DSi and suggest that biogenic silica dissolution is the main source of DSi in porewaters and consequently of the benthic fluxes. Our integrated data‐model assessment highlights the impact of surface productivity on sedimentary processes and the dynamic environment of core‐top sediments where dissolution and reverse weathering reactions control DSi exchanges. Article in Journal/Newspaper Antarc* Antarctic Antarctic Peninsula Natural Environment Research Council: NERC Open Research Archive Antarctic Antarctic Peninsula Global Biogeochemical Cycles 34 12 |
institution |
Open Polar |
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Natural Environment Research Council: NERC Open Research Archive |
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ftnerc |
language |
English |
description |
In this study we evaluate the benthic fluxes of silicic acid along the West Antarctic Peninsula (WAP). Silicic acid (DSi) is one of the macronutrients essential in fuelling biological hot spots of diatom‐dominated primary production along the WAP. Here we measure the concentration and stable silicon isotopic composition of DSi in porewater profiles, biogenic silica content (BSi), and diatom abundance from sediment cores collected along the WAP. We couple these measurements with reaction‐transport modeling, to assess the DSi flux and the processes that release this key nutrient from the sediment into the overlying waters. Our results show that the benthic DSi flux is dominated by the diffusive flux, which is estimated to be equivalent to 26.7 ± 2.7 Gmol yr−1 for the WAP continental shelf. The DSi isotope profiles reveal the important impact of sedimentary processes on porewater DSi and suggest that biogenic silica dissolution is the main source of DSi in porewaters and consequently of the benthic fluxes. Our integrated data‐model assessment highlights the impact of surface productivity on sedimentary processes and the dynamic environment of core‐top sediments where dissolution and reverse weathering reactions control DSi exchanges. |
format |
Article in Journal/Newspaper |
author |
Cassarino, Lucie Hendry, Katharine R. Henley, Sian F. MacDonald, Ellen Arndt, Sandra Freitas, Felipe S. Pike, Jennifer Firing, Yvonne L. |
spellingShingle |
Cassarino, Lucie Hendry, Katharine R. Henley, Sian F. MacDonald, Ellen Arndt, Sandra Freitas, Felipe S. Pike, Jennifer Firing, Yvonne L. Sedimentary nutrient supply in productive hot spots off the West Antarctic peninsula revealed by silicon isotopes |
author_facet |
Cassarino, Lucie Hendry, Katharine R. Henley, Sian F. MacDonald, Ellen Arndt, Sandra Freitas, Felipe S. Pike, Jennifer Firing, Yvonne L. |
author_sort |
Cassarino, Lucie |
title |
Sedimentary nutrient supply in productive hot spots off the West Antarctic peninsula revealed by silicon isotopes |
title_short |
Sedimentary nutrient supply in productive hot spots off the West Antarctic peninsula revealed by silicon isotopes |
title_full |
Sedimentary nutrient supply in productive hot spots off the West Antarctic peninsula revealed by silicon isotopes |
title_fullStr |
Sedimentary nutrient supply in productive hot spots off the West Antarctic peninsula revealed by silicon isotopes |
title_full_unstemmed |
Sedimentary nutrient supply in productive hot spots off the West Antarctic peninsula revealed by silicon isotopes |
title_sort |
sedimentary nutrient supply in productive hot spots off the west antarctic peninsula revealed by silicon isotopes |
publishDate |
2020 |
url |
http://nora.nerc.ac.uk/id/eprint/529359/ https://nora.nerc.ac.uk/id/eprint/529359/1/2019GB006486.pdf https://doi.org/10.1029/2019GB006486 |
geographic |
Antarctic Antarctic Peninsula |
geographic_facet |
Antarctic Antarctic Peninsula |
genre |
Antarc* Antarctic Antarctic Peninsula |
genre_facet |
Antarc* Antarctic Antarctic Peninsula |
op_relation |
https://nora.nerc.ac.uk/id/eprint/529359/1/2019GB006486.pdf Cassarino, Lucie; Hendry, Katharine R.; Henley, Sian F.; MacDonald, Ellen; Arndt, Sandra; Freitas, Felipe S.; Pike, Jennifer; Firing, Yvonne L. orcid:0000-0002-3640-3974 . 2020 Sedimentary nutrient supply in productive hot spots off the West Antarctic peninsula revealed by silicon isotopes. Global Biogeochemical Cycles, 34 (12), e2019GB006486. https://doi.org/10.1029/2019GB006486 <https://doi.org/10.1029/2019GB006486> |
op_rights |
cc_by_4 |
op_rightsnorm |
CC-BY |
op_doi |
https://doi.org/10.1029/2019GB006486 |
container_title |
Global Biogeochemical Cycles |
container_volume |
34 |
container_issue |
12 |
_version_ |
1766157213257170944 |