Carbonate counter pump stimulated by natural iron fertilization in the Polar Frontal Zone
International audience The production of organic carbon in the ocean’s surface and its subsequent downward export transfers carbon dioxide to the deep ocean. This CO2 drawdown is countered by the biological precipitation of carbonate, followed by sinking of particulate inorganic carbon, which is a s...
Published in: | Nature Geoscience |
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Main Authors: | , , , , , |
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Format: | Article in Journal/Newspaper |
Language: | English |
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HAL CCSD
2014
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Online Access: | https://univ-angers.hal.science/hal-03278278 https://univ-angers.hal.science/hal-03278278/document https://univ-angers.hal.science/hal-03278278/file/salter_et_al_2014_nature_geoscience.pdf https://doi.org/10.1038/ngeo2285 |
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HAL Sorbonne Université |
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ftsorbonneuniv |
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English |
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[SDU]Sciences of the Universe [physics] |
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[SDU]Sciences of the Universe [physics] Salter, Ian Schiebel, Ralf Ziveri, Patrizia Movellan, Aurore Lampitt, Richard Wolff, George Carbonate counter pump stimulated by natural iron fertilization in the Polar Frontal Zone |
topic_facet |
[SDU]Sciences of the Universe [physics] |
description |
International audience The production of organic carbon in the ocean’s surface and its subsequent downward export transfers carbon dioxide to the deep ocean. This CO2 drawdown is countered by the biological precipitation of carbonate, followed by sinking of particulate inorganic carbon, which is a source of carbon dioxide to the surface ocean, and hence the atmosphere over 100–1,000 year timescales1. The net transfer of CO2 to the deep ocean is therefore dependent on the relative amount of organic and inorganic carbon in sinking particles2. In the Southern Ocean, iron fertilization has been shown to increase the export of organic carbon3, 4, 5, but it is unclear to what degree this effect is compensated by the export of inorganic carbon. Here we assess the composition of sinking particles collected from sediment traps located in the Polar Frontal Zone of the Southern Ocean. We find that in high-nutrient, low-chlorophyll regions that are characterized by naturally high iron concentrations, fluxes of both organic and inorganic carbon are higher than in regions with no iron fertilization. However, the excess flux of inorganic carbon is greater than that of organic carbon. We estimate that the production and flux of carbonate in naturally iron-fertilized waters reduces the overall amount of CO2 transferred to the deep ocean by 6–32%, compared to 1–4% at the non-fertilized site. We suggest that an increased export of organic carbon, stimulated by iron availability in the glacial sub-Antarctic oceans, may have been accompanied by a strengthened carbonate counter pump. |
author2 |
Laboratoire d'Ecogéochimie des environnements benthiques (LECOB) Observatoire océanologique de Banyuls (OOB) Université Pierre et Marie Curie - Paris 6 (UPMC)-Centre National de la Recherche Scientifique (CNRS)-Université Pierre et Marie Curie - Paris 6 (UPMC)-Centre National de la Recherche Scientifique (CNRS)-Centre National de la Recherche Scientifique (CNRS) Laboratoire de Planétologie et Géodynamique - Angers (LPG-ANGERS) Laboratoire de Planétologie et Géodynamique UMR 6112 (LPG) Université d'Angers (UA)-Université de Nantes - UFR des Sciences et des Techniques (UN UFR ST) Université de Nantes (UN)-Université de Nantes (UN)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS)-Université d'Angers (UA)-Université de Nantes - UFR des Sciences et des Techniques (UN UFR ST) Université de Nantes (UN)-Université de Nantes (UN)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS) Institute of Environmental Science and Technology Barcelona (ICTA) Universitat Autònoma de Barcelona = Autonomous University of Barcelona = Universidad Autónoma de Barcelona (UAB) National Oceanography Center-Southampton University of Southampton |
format |
Article in Journal/Newspaper |
author |
Salter, Ian Schiebel, Ralf Ziveri, Patrizia Movellan, Aurore Lampitt, Richard Wolff, George |
author_facet |
Salter, Ian Schiebel, Ralf Ziveri, Patrizia Movellan, Aurore Lampitt, Richard Wolff, George |
author_sort |
Salter, Ian |
title |
Carbonate counter pump stimulated by natural iron fertilization in the Polar Frontal Zone |
title_short |
Carbonate counter pump stimulated by natural iron fertilization in the Polar Frontal Zone |
title_full |
Carbonate counter pump stimulated by natural iron fertilization in the Polar Frontal Zone |
title_fullStr |
Carbonate counter pump stimulated by natural iron fertilization in the Polar Frontal Zone |
title_full_unstemmed |
Carbonate counter pump stimulated by natural iron fertilization in the Polar Frontal Zone |
title_sort |
carbonate counter pump stimulated by natural iron fertilization in the polar frontal zone |
publisher |
HAL CCSD |
publishDate |
2014 |
url |
https://univ-angers.hal.science/hal-03278278 https://univ-angers.hal.science/hal-03278278/document https://univ-angers.hal.science/hal-03278278/file/salter_et_al_2014_nature_geoscience.pdf https://doi.org/10.1038/ngeo2285 |
genre |
Antarc* Antarctic Southern Ocean |
genre_facet |
Antarc* Antarctic Southern Ocean |
op_source |
ISSN: 1752-0894 Nature Geoscience https://univ-angers.hal.science/hal-03278278 Nature Geoscience, 2014, 7 (12), pp.885-889. ⟨10.1038/ngeo2285⟩ https://www.nature.com/articles/ngeo2285 |
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info:eu-repo/semantics/altIdentifier/doi/10.1038/ngeo2285 hal-03278278 https://univ-angers.hal.science/hal-03278278 https://univ-angers.hal.science/hal-03278278/document https://univ-angers.hal.science/hal-03278278/file/salter_et_al_2014_nature_geoscience.pdf doi:10.1038/ngeo2285 OKINA: ua11470 |
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info:eu-repo/semantics/OpenAccess |
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https://doi.org/10.1038/ngeo2285 |
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Nature Geoscience |
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12 |
container_start_page |
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op_container_end_page |
889 |
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1810489028276912128 |
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ftsorbonneuniv:oai:HAL:hal-03278278v1 2024-09-15T17:42:27+00:00 Carbonate counter pump stimulated by natural iron fertilization in the Polar Frontal Zone Salter, Ian Schiebel, Ralf Ziveri, Patrizia Movellan, Aurore Lampitt, Richard Wolff, George Laboratoire d'Ecogéochimie des environnements benthiques (LECOB) Observatoire océanologique de Banyuls (OOB) Université Pierre et Marie Curie - Paris 6 (UPMC)-Centre National de la Recherche Scientifique (CNRS)-Université Pierre et Marie Curie - Paris 6 (UPMC)-Centre National de la Recherche Scientifique (CNRS)-Centre National de la Recherche Scientifique (CNRS) Laboratoire de Planétologie et Géodynamique - Angers (LPG-ANGERS) Laboratoire de Planétologie et Géodynamique UMR 6112 (LPG) Université d'Angers (UA)-Université de Nantes - UFR des Sciences et des Techniques (UN UFR ST) Université de Nantes (UN)-Université de Nantes (UN)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS)-Université d'Angers (UA)-Université de Nantes - UFR des Sciences et des Techniques (UN UFR ST) Université de Nantes (UN)-Université de Nantes (UN)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS) Institute of Environmental Science and Technology Barcelona (ICTA) Universitat Autònoma de Barcelona = Autonomous University of Barcelona = Universidad Autónoma de Barcelona (UAB) National Oceanography Center-Southampton University of Southampton 2014 https://univ-angers.hal.science/hal-03278278 https://univ-angers.hal.science/hal-03278278/document https://univ-angers.hal.science/hal-03278278/file/salter_et_al_2014_nature_geoscience.pdf https://doi.org/10.1038/ngeo2285 en eng HAL CCSD Nature Publishing Group info:eu-repo/semantics/altIdentifier/doi/10.1038/ngeo2285 hal-03278278 https://univ-angers.hal.science/hal-03278278 https://univ-angers.hal.science/hal-03278278/document https://univ-angers.hal.science/hal-03278278/file/salter_et_al_2014_nature_geoscience.pdf doi:10.1038/ngeo2285 OKINA: ua11470 info:eu-repo/semantics/OpenAccess ISSN: 1752-0894 Nature Geoscience https://univ-angers.hal.science/hal-03278278 Nature Geoscience, 2014, 7 (12), pp.885-889. ⟨10.1038/ngeo2285⟩ https://www.nature.com/articles/ngeo2285 [SDU]Sciences of the Universe [physics] info:eu-repo/semantics/article Journal articles 2014 ftsorbonneuniv https://doi.org/10.1038/ngeo2285 2024-08-08T23:33:31Z International audience The production of organic carbon in the ocean’s surface and its subsequent downward export transfers carbon dioxide to the deep ocean. This CO2 drawdown is countered by the biological precipitation of carbonate, followed by sinking of particulate inorganic carbon, which is a source of carbon dioxide to the surface ocean, and hence the atmosphere over 100–1,000 year timescales1. The net transfer of CO2 to the deep ocean is therefore dependent on the relative amount of organic and inorganic carbon in sinking particles2. In the Southern Ocean, iron fertilization has been shown to increase the export of organic carbon3, 4, 5, but it is unclear to what degree this effect is compensated by the export of inorganic carbon. Here we assess the composition of sinking particles collected from sediment traps located in the Polar Frontal Zone of the Southern Ocean. We find that in high-nutrient, low-chlorophyll regions that are characterized by naturally high iron concentrations, fluxes of both organic and inorganic carbon are higher than in regions with no iron fertilization. However, the excess flux of inorganic carbon is greater than that of organic carbon. We estimate that the production and flux of carbonate in naturally iron-fertilized waters reduces the overall amount of CO2 transferred to the deep ocean by 6–32%, compared to 1–4% at the non-fertilized site. We suggest that an increased export of organic carbon, stimulated by iron availability in the glacial sub-Antarctic oceans, may have been accompanied by a strengthened carbonate counter pump. Article in Journal/Newspaper Antarc* Antarctic Southern Ocean HAL Sorbonne Université Nature Geoscience 7 12 885 889 |