Surface-water iron supplies in the Southern Ocean sustained by deep winter mixing
International audience Low levels of iron limit primary productivity across much of the Southern Ocean. At the basin scale, most dissolved iron is supplied to surface waters from subsurface reservoirs, because land inputs are spatially limited. Deep mixing in winter together with year-round diffusio...
Published in: | Nature Geoscience |
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Format: | Article in Journal/Newspaper |
Language: | English |
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Online Access: | https://doi.org/10.1038/NGEO2101 https://hal.archives-ouvertes.fr/hal-00983558 |
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envir geo Tagliabue, Alessandro Sallée, Jean-Baptiste Bowie, Andrew R. Lévy, Marina Swart, Sebastiaan Boyd, Philip W. Surface-water iron supplies in the Southern Ocean sustained by deep winter mixing |
topic_facet |
envir geo |
description |
International audience Low levels of iron limit primary productivity across much of the Southern Ocean. At the basin scale, most dissolved iron is supplied to surface waters from subsurface reservoirs, because land inputs are spatially limited. Deep mixing in winter together with year-round diffusion across density surfaces, known as diapycnal diffusion, are the main physical processes that carry iron-laden subsurface waters to the surface. Here, we analyse data on dissolved iron concentrations in the top 1,000 m of the Southern Ocean, taken from all known and available cruises to date, together with hydrographic data to determine the relative importance of deep winter mixing and diapycnal diffusion to dissolved iron fluxes at the basin scale. Using information on the vertical distribution of iron we show that deep winter mixing supplies ten times more iron to the surface ocean each year, on average, than diapycnal diffusion. Biological observations from the sub-Antarctic sector suggest that following the depletion of this wintertime iron pulse, intense iron recycling sustains productivity over the subsequent spring and summer. We conclude that winter mixing and surface-water iron recycling are important drivers of temporal variations in Southern Ocean primary production. |
author2 |
Department of Earth Ocean and Ecological Sciences Liverpool University of Liverpool Processus de couplage à Petite Echelle, Ecosystèmes et Prédateurs Supérieurs (PEPS) Laboratoire d'Océanographie et du Climat : Expérimentations et Approches Numériques (LOCEAN) Institut de Recherche pour le Développement (IRD)-Centre National de la Recherche Scientifique (CNRS)-Institut national des sciences de l'Univers (INSU - CNRS)-Université Pierre et Marie Curie - Paris 6 (UPMC)-Muséum national d'Histoire naturelle (MNHN)-Institut Pierre-Simon-Laplace (IPSL (FR_636)) École normale supérieure - Paris (ENS Paris) Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Université de Versailles Saint-Quentin-en-Yvelines (UVSQ)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut national des sciences de l'Univers (INSU - CNRS)-Université Paris Diderot - Paris 7 (UPD7)-École polytechnique (X)-Centre National d'Études Spatiales Toulouse (CNES)-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS)-École normale supérieure - Paris (ENS Paris) Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Université de Versailles Saint-Quentin-en-Yvelines (UVSQ)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris Diderot - Paris 7 (UPD7)-École polytechnique (X)-Centre National d'Études Spatiales Toulouse (CNES)-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS)-Institut de Recherche pour le Développement (IRD)-Centre National de la Recherche Scientifique (CNRS)-Institut national des sciences de l'Univers (INSU - CNRS)-Université Pierre et Marie Curie - Paris 6 (UPMC)-Muséum national d'Histoire naturelle (MNHN)-Institut Pierre-Simon-Laplace (IPSL (FR_636)) Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Université de Versailles Saint-Quentin-en-Yvelines (UVSQ)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris Diderot - Paris 7 (UPD7)-École polytechnique (X)-Centre National d'Études Spatiales Toulouse (CNES)-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS) Department of Oceanography Cape Town University of Cape Town |
format |
Article in Journal/Newspaper |
author |
Tagliabue, Alessandro Sallée, Jean-Baptiste Bowie, Andrew R. Lévy, Marina Swart, Sebastiaan Boyd, Philip W. |
author_facet |
Tagliabue, Alessandro Sallée, Jean-Baptiste Bowie, Andrew R. Lévy, Marina Swart, Sebastiaan Boyd, Philip W. |
author_sort |
Tagliabue, Alessandro |
title |
Surface-water iron supplies in the Southern Ocean sustained by deep winter mixing |
title_short |
Surface-water iron supplies in the Southern Ocean sustained by deep winter mixing |
title_full |
Surface-water iron supplies in the Southern Ocean sustained by deep winter mixing |
title_fullStr |
Surface-water iron supplies in the Southern Ocean sustained by deep winter mixing |
title_full_unstemmed |
Surface-water iron supplies in the Southern Ocean sustained by deep winter mixing |
title_sort |
surface-water iron supplies in the southern ocean sustained by deep winter mixing |
publisher |
HAL CCSD |
publishDate |
2014 |
url |
https://doi.org/10.1038/NGEO2101 https://hal.archives-ouvertes.fr/hal-00983558 |
geographic |
Antarctic Southern Ocean |
geographic_facet |
Antarctic Southern Ocean |
genre |
Antarc* Antarctic Southern Ocean |
genre_facet |
Antarc* Antarctic Southern Ocean |
op_source |
Hyper Article en Ligne - Sciences de l'Homme et de la Société ISSN: 1752-0894 Nature Geoscience Nature Geoscience, Nature Publishing Group, 2014, 7, pp.314-320. ⟨10.1038/NGEO2101⟩ |
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hal-00983558 BIBCODE: 2014NatGe.7.314T doi:10.1038/NGEO2101 10670/1.m9jj3n https://hal.archives-ouvertes.fr/hal-00983558 |
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op_doi |
https://doi.org/10.1038/NGEO2101 |
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Nature Geoscience |
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7 |
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4 |
container_start_page |
314 |
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320 |
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1766105263460319232 |
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fttriple:oai:gotriple.eu:10670/1.m9jj3n 2023-05-15T13:38:22+02:00 Surface-water iron supplies in the Southern Ocean sustained by deep winter mixing Tagliabue, Alessandro Sallée, Jean-Baptiste Bowie, Andrew R. Lévy, Marina Swart, Sebastiaan Boyd, Philip W. Department of Earth Ocean and Ecological Sciences Liverpool University of Liverpool Processus de couplage à Petite Echelle, Ecosystèmes et Prédateurs Supérieurs (PEPS) Laboratoire d'Océanographie et du Climat : Expérimentations et Approches Numériques (LOCEAN) Institut de Recherche pour le Développement (IRD)-Centre National de la Recherche Scientifique (CNRS)-Institut national des sciences de l'Univers (INSU - CNRS)-Université Pierre et Marie Curie - Paris 6 (UPMC)-Muséum national d'Histoire naturelle (MNHN)-Institut Pierre-Simon-Laplace (IPSL (FR_636)) École normale supérieure - Paris (ENS Paris) Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Université de Versailles Saint-Quentin-en-Yvelines (UVSQ)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut national des sciences de l'Univers (INSU - CNRS)-Université Paris Diderot - Paris 7 (UPD7)-École polytechnique (X)-Centre National d'Études Spatiales Toulouse (CNES)-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS)-École normale supérieure - Paris (ENS Paris) Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Université de Versailles Saint-Quentin-en-Yvelines (UVSQ)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris Diderot - Paris 7 (UPD7)-École polytechnique (X)-Centre National d'Études Spatiales Toulouse (CNES)-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS)-Institut de Recherche pour le Développement (IRD)-Centre National de la Recherche Scientifique (CNRS)-Institut national des sciences de l'Univers (INSU - CNRS)-Université Pierre et Marie Curie - Paris 6 (UPMC)-Muséum national d'Histoire naturelle (MNHN)-Institut Pierre-Simon-Laplace (IPSL (FR_636)) Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Université de Versailles Saint-Quentin-en-Yvelines (UVSQ)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris Diderot - Paris 7 (UPD7)-École polytechnique (X)-Centre National d'Études Spatiales Toulouse (CNES)-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS) Department of Oceanography Cape Town University of Cape Town 2014-04-01 https://doi.org/10.1038/NGEO2101 https://hal.archives-ouvertes.fr/hal-00983558 en eng HAL CCSD Nature Publishing Group hal-00983558 BIBCODE: 2014NatGe.7.314T doi:10.1038/NGEO2101 10670/1.m9jj3n https://hal.archives-ouvertes.fr/hal-00983558 undefined Hyper Article en Ligne - Sciences de l'Homme et de la Société ISSN: 1752-0894 Nature Geoscience Nature Geoscience, Nature Publishing Group, 2014, 7, pp.314-320. ⟨10.1038/NGEO2101⟩ envir geo Journal Article https://vocabularies.coar-repositories.org/resource_types/c_6501/ 2014 fttriple https://doi.org/10.1038/NGEO2101 2023-01-22T18:44:59Z International audience Low levels of iron limit primary productivity across much of the Southern Ocean. At the basin scale, most dissolved iron is supplied to surface waters from subsurface reservoirs, because land inputs are spatially limited. Deep mixing in winter together with year-round diffusion across density surfaces, known as diapycnal diffusion, are the main physical processes that carry iron-laden subsurface waters to the surface. Here, we analyse data on dissolved iron concentrations in the top 1,000 m of the Southern Ocean, taken from all known and available cruises to date, together with hydrographic data to determine the relative importance of deep winter mixing and diapycnal diffusion to dissolved iron fluxes at the basin scale. Using information on the vertical distribution of iron we show that deep winter mixing supplies ten times more iron to the surface ocean each year, on average, than diapycnal diffusion. Biological observations from the sub-Antarctic sector suggest that following the depletion of this wintertime iron pulse, intense iron recycling sustains productivity over the subsequent spring and summer. We conclude that winter mixing and surface-water iron recycling are important drivers of temporal variations in Southern Ocean primary production. Article in Journal/Newspaper Antarc* Antarctic Southern Ocean Unknown Antarctic Southern Ocean Nature Geoscience 7 4 314 320 |