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...
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ftunivbruxelles:oai:dipot.ulb.ac.be:2013/316636 2023-05-15T13:37:29+02:00 Sedimentary Nutrient Supply in Productive Hot Spots off the West Antarctic Peninsula Revealed by Silicon Isotopes Cassarino, Lucie Hendry, Katharine K.R. Henley, Sian S.F. MacDonald, Ellen Arndt, Sandra Freitas, Felipe F.S. Pike, Jennifer Firing, Yvonne Y.L. 2020-12-01 1 full-text file(s): application/pdf http://hdl.handle.net/2013/ULB-DIPOT:oai:dipot.ulb.ac.be:2013/316636 https://dipot.ulb.ac.be/dspace/bitstream/2013/316636/3/2019GB006486.pdf en eng uri/info:doi/10.1029/2019GB006486 uri/info:scp/85097983471 https://dipot.ulb.ac.be/dspace/bitstream/2013/316636/3/2019GB006486.pdf http://hdl.handle.net/2013/ULB-DIPOT:oai:dipot.ulb.ac.be:2013/316636 1 full-text file(s): info:eu-repo/semantics/openAccess Global biogeochemical cycles, 34 (12 Environnement et pollution Technologie de l'environnement contrôle de la pollution Phénomènes atmosphériques benthic flux continental shelf sediment cycling silicon cycle info:eu-repo/semantics/article info:ulb-repo/semantics/articlePeerReview info:ulb-repo/semantics/openurl/article 2020 ftunivbruxelles 2022-06-12T22:07:59Z 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. SCOPUS: ar.j info:eu-repo/semantics/published Article in Journal/Newspaper Antarc* Antarctic Antarctic Peninsula DI-fusion : dépôt institutionnel de l'Université libre de Bruxelles (ULB) Antarctic Antarctic Peninsula |
institution |
Open Polar |
collection |
DI-fusion : dépôt institutionnel de l'Université libre de Bruxelles (ULB) |
op_collection_id |
ftunivbruxelles |
language |
English |
topic |
Environnement et pollution Technologie de l'environnement contrôle de la pollution Phénomènes atmosphériques benthic flux continental shelf sediment cycling silicon cycle |
spellingShingle |
Environnement et pollution Technologie de l'environnement contrôle de la pollution Phénomènes atmosphériques benthic flux continental shelf sediment cycling silicon cycle Cassarino, Lucie Hendry, Katharine K.R. Henley, Sian S.F. MacDonald, Ellen Arndt, Sandra Freitas, Felipe F.S. Pike, Jennifer Firing, Yvonne Y.L. Sedimentary Nutrient Supply in Productive Hot Spots off the West Antarctic Peninsula Revealed by Silicon Isotopes |
topic_facet |
Environnement et pollution Technologie de l'environnement contrôle de la pollution Phénomènes atmosphériques benthic flux continental shelf sediment cycling silicon cycle |
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. SCOPUS: ar.j info:eu-repo/semantics/published |
format |
Article in Journal/Newspaper |
author |
Cassarino, Lucie Hendry, Katharine K.R. Henley, Sian S.F. MacDonald, Ellen Arndt, Sandra Freitas, Felipe F.S. Pike, Jennifer Firing, Yvonne Y.L. |
author_facet |
Cassarino, Lucie Hendry, Katharine K.R. Henley, Sian S.F. MacDonald, Ellen Arndt, Sandra Freitas, Felipe F.S. Pike, Jennifer Firing, Yvonne Y.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://hdl.handle.net/2013/ULB-DIPOT:oai:dipot.ulb.ac.be:2013/316636 https://dipot.ulb.ac.be/dspace/bitstream/2013/316636/3/2019GB006486.pdf |
geographic |
Antarctic Antarctic Peninsula |
geographic_facet |
Antarctic Antarctic Peninsula |
genre |
Antarc* Antarctic Antarctic Peninsula |
genre_facet |
Antarc* Antarctic Antarctic Peninsula |
op_source |
Global biogeochemical cycles, 34 (12 |
op_relation |
uri/info:doi/10.1029/2019GB006486 uri/info:scp/85097983471 https://dipot.ulb.ac.be/dspace/bitstream/2013/316636/3/2019GB006486.pdf http://hdl.handle.net/2013/ULB-DIPOT:oai:dipot.ulb.ac.be:2013/316636 |
op_rights |
1 full-text file(s): info:eu-repo/semantics/openAccess |
_version_ |
1766092314166427648 |