Resupply of mesopelagic dissolved iron controlled by particulate iron composition
International audience The dissolved iron supply controls half of the oceans’ primary productivity. Resupply by the remineralization of sinking particles, and subsequent vertical mixing, largely sustains this productivity. However, our understanding of the drivers of dissolved iron resupply, and the...
Published in: | Nature Geoscience |
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Main Authors: | , , , , , , , , |
Other Authors: | , , , , , , , , , , , , , , , , |
Format: | Article in Journal/Newspaper |
Language: | English |
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HAL CCSD
2019
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Online Access: | https://doi.org/10.1038/s41561-019-0476-6 https://hal.archives-ouvertes.fr/hal-02366981/file/Bressac_et_al_2019_NATgeoscience_preprint.pdf https://hal.archives-ouvertes.fr/hal-02366981 |
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English |
topic |
ACL EXPORT FLUXES BIOGEOCHEMISTRY REMINERALIZATION CARBON SEQUESTRATION POLAR FRONTAL ZONES DUST-DEPOSITION SOUTHERN-OCEAN MEDITERRANEAN SEA SEDIMENT TRAP envir geo |
spellingShingle |
ACL EXPORT FLUXES BIOGEOCHEMISTRY REMINERALIZATION CARBON SEQUESTRATION POLAR FRONTAL ZONES DUST-DEPOSITION SOUTHERN-OCEAN MEDITERRANEAN SEA SEDIMENT TRAP envir geo Bressac, M. Guieu, Cécile Ellwood, M. Tagliabue, A. Wagener, T. Laurenceau-Cornec, E. Whitby, H. Sarthou, Géraldine BOYD, P. Resupply of mesopelagic dissolved iron controlled by particulate iron composition |
topic_facet |
ACL EXPORT FLUXES BIOGEOCHEMISTRY REMINERALIZATION CARBON SEQUESTRATION POLAR FRONTAL ZONES DUST-DEPOSITION SOUTHERN-OCEAN MEDITERRANEAN SEA SEDIMENT TRAP envir geo |
description |
International audience The dissolved iron supply controls half of the oceans’ primary productivity. Resupply by the remineralization of sinking particles, and subsequent vertical mixing, largely sustains this productivity. However, our understanding of the drivers of dissolved iron resupply, and their influence on its vertical distribution across the oceans, is still limited due to sparse observations. There is a lack of empirical evidence as to what controls the subsurface iron remineralization due to difficulties in studying mesopelagic biogeochemistry. Here we present estimates of particulate transformations to dissolved iron, concurrent oxygen consumption and iron-binding ligand replenishment based on in situ mesopelagic experiments. Dissolved iron regeneration efficiencies (that is, replenishment over oxygen consumption) were 10- to 100-fold higher in low-dust subantarctic waters relative to higher-dust Mediterranean sites. Regeneration efficiencies are heavily influenced by particle composition. Their make-up dictates ligand release, controls scavenging, modulates ballasting and may lead to the differential remineralization of biogenic versus lithogenic iron. At high-dust sites, these processes together increase the iron remineralization length scale. Modelling reveals that in oceanic regions near deserts, enhanced lithogenic fluxes deepen the ferricline, which alter the vertical patterns of dissolved iron replenishment, and set its redistribution at the global scale. Such wide-ranging regeneration efficiencies drive different vertical patterns in dissolved iron replenishment across oceanic provinces. |
author2 |
Institute for Marine and Antarctic Studies Horbat (IMAS) University of Tasmania Hobart, Australia (UTAS) Laboratoire d'océanographie de Villefranche (LOV) Institut national des sciences de l'Univers (INSU - CNRS)-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS)-Institut de la Mer de Villefranche (IMEV) Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS)-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS) Observatoire océanologique de Villefranche-sur-mer (OOVM) Centre National de la Recherche Scientifique (CNRS)-Institut national des sciences de l'Univers (INSU - CNRS)-Université Pierre et Marie Curie - Paris 6 (UPMC)-Centre National de la Recherche Scientifique (CNRS)-Institut national des sciences de l'Univers (INSU - CNRS)-Université Pierre et Marie Curie - Paris 6 (UPMC)-Centre National de la Recherche Scientifique (CNRS) Australian National University (ANU) Department of Earth Ocean and Ecological Sciences Liverpool University of Liverpool Institut méditerranéen d'océanologie (MIO) Institut de Recherche pour le Développement (IRD)-Aix Marseille Université (AMU)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS)-Université de Toulon (UTLN) Laboratoire des Sciences de l'Environnement Marin (LEMAR) (LEMAR) Institut Universitaire Européen de la Mer (IUEM) Institut de Recherche pour le Développement (IRD)-Institut national des sciences de l'Univers (INSU - CNRS)-Université de Brest (UBO)-Centre National de la Recherche Scientifique (CNRS)-Institut de Recherche pour le Développement (IRD)-Institut national des sciences de l'Univers (INSU - CNRS)-Université de Brest (UBO)-Centre National de la Recherche Scientifique (CNRS)-Institut Français de Recherche pour l'Exploitation de la Mer (IFREMER)-Centre National de la Recherche Scientifique (CNRS)-Université de Brest (UBO) Antarctic Climate and Ecosystems Cooperative Research Centre (ACE-CRC) European Project: 626734,EC:FP7:PEOPLE,FP7-PEOPLE-2013-IOF,IRON-IC(2014) |
format |
Article in Journal/Newspaper |
author |
Bressac, M. Guieu, Cécile Ellwood, M. Tagliabue, A. Wagener, T. Laurenceau-Cornec, E. Whitby, H. Sarthou, Géraldine BOYD, P. |
author_facet |
Bressac, M. Guieu, Cécile Ellwood, M. Tagliabue, A. Wagener, T. Laurenceau-Cornec, E. Whitby, H. Sarthou, Géraldine BOYD, P. |
author_sort |
Bressac, M. |
title |
Resupply of mesopelagic dissolved iron controlled by particulate iron composition |
title_short |
Resupply of mesopelagic dissolved iron controlled by particulate iron composition |
title_full |
Resupply of mesopelagic dissolved iron controlled by particulate iron composition |
title_fullStr |
Resupply of mesopelagic dissolved iron controlled by particulate iron composition |
title_full_unstemmed |
Resupply of mesopelagic dissolved iron controlled by particulate iron composition |
title_sort |
resupply of mesopelagic dissolved iron controlled by particulate iron composition |
publisher |
HAL CCSD |
publishDate |
2019 |
url |
https://doi.org/10.1038/s41561-019-0476-6 https://hal.archives-ouvertes.fr/hal-02366981/file/Bressac_et_al_2019_NATgeoscience_preprint.pdf https://hal.archives-ouvertes.fr/hal-02366981 |
geographic |
Southern Ocean |
geographic_facet |
Southern Ocean |
genre |
Southern Ocean |
genre_facet |
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, 2019, 12 (12), pp.995-1003. ⟨10.1038/s41561-019-0476-6⟩ |
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hal-02366981 doi:10.1038/s41561-019-0476-6 10670/1.taeqdy https://hal.archives-ouvertes.fr/hal-02366981/file/Bressac_et_al_2019_NATgeoscience_preprint.pdf https://hal.archives-ouvertes.fr/hal-02366981 |
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op_doi |
https://doi.org/10.1038/s41561-019-0476-6 |
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Nature Geoscience |
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fttriple:oai:gotriple.eu:10670/1.taeqdy 2023-05-15T18:25:40+02:00 Resupply of mesopelagic dissolved iron controlled by particulate iron composition Bressac, M. Guieu, Cécile Ellwood, M. Tagliabue, A. Wagener, T. Laurenceau-Cornec, E. Whitby, H. Sarthou, Géraldine BOYD, P. Institute for Marine and Antarctic Studies Horbat (IMAS) University of Tasmania Hobart, Australia (UTAS) Laboratoire d'océanographie de Villefranche (LOV) Institut national des sciences de l'Univers (INSU - CNRS)-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS)-Institut de la Mer de Villefranche (IMEV) Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS)-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS) Observatoire océanologique de Villefranche-sur-mer (OOVM) Centre National de la Recherche Scientifique (CNRS)-Institut national des sciences de l'Univers (INSU - CNRS)-Université Pierre et Marie Curie - Paris 6 (UPMC)-Centre National de la Recherche Scientifique (CNRS)-Institut national des sciences de l'Univers (INSU - CNRS)-Université Pierre et Marie Curie - Paris 6 (UPMC)-Centre National de la Recherche Scientifique (CNRS) Australian National University (ANU) Department of Earth Ocean and Ecological Sciences Liverpool University of Liverpool Institut méditerranéen d'océanologie (MIO) Institut de Recherche pour le Développement (IRD)-Aix Marseille Université (AMU)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS)-Université de Toulon (UTLN) Laboratoire des Sciences de l'Environnement Marin (LEMAR) (LEMAR) Institut Universitaire Européen de la Mer (IUEM) Institut de Recherche pour le Développement (IRD)-Institut national des sciences de l'Univers (INSU - CNRS)-Université de Brest (UBO)-Centre National de la Recherche Scientifique (CNRS)-Institut de Recherche pour le Développement (IRD)-Institut national des sciences de l'Univers (INSU - CNRS)-Université de Brest (UBO)-Centre National de la Recherche Scientifique (CNRS)-Institut Français de Recherche pour l'Exploitation de la Mer (IFREMER)-Centre National de la Recherche Scientifique (CNRS)-Université de Brest (UBO) Antarctic Climate and Ecosystems Cooperative Research Centre (ACE-CRC) European Project: 626734,EC:FP7:PEOPLE,FP7-PEOPLE-2013-IOF,IRON-IC(2014) 2019-12-01 https://doi.org/10.1038/s41561-019-0476-6 https://hal.archives-ouvertes.fr/hal-02366981/file/Bressac_et_al_2019_NATgeoscience_preprint.pdf https://hal.archives-ouvertes.fr/hal-02366981 en eng HAL CCSD Nature Publishing Group hal-02366981 doi:10.1038/s41561-019-0476-6 10670/1.taeqdy https://hal.archives-ouvertes.fr/hal-02366981/file/Bressac_et_al_2019_NATgeoscience_preprint.pdf https://hal.archives-ouvertes.fr/hal-02366981 other Hyper Article en Ligne - Sciences de l'Homme et de la Société ISSN: 1752-0894 Nature Geoscience Nature Geoscience, Nature Publishing Group, 2019, 12 (12), pp.995-1003. ⟨10.1038/s41561-019-0476-6⟩ ACL EXPORT FLUXES BIOGEOCHEMISTRY REMINERALIZATION CARBON SEQUESTRATION POLAR FRONTAL ZONES DUST-DEPOSITION SOUTHERN-OCEAN MEDITERRANEAN SEA SEDIMENT TRAP envir geo Journal Article https://vocabularies.coar-repositories.org/resource_types/c_6501/ 2019 fttriple https://doi.org/10.1038/s41561-019-0476-6 2023-01-22T17:35:25Z International audience The dissolved iron supply controls half of the oceans’ primary productivity. Resupply by the remineralization of sinking particles, and subsequent vertical mixing, largely sustains this productivity. However, our understanding of the drivers of dissolved iron resupply, and their influence on its vertical distribution across the oceans, is still limited due to sparse observations. There is a lack of empirical evidence as to what controls the subsurface iron remineralization due to difficulties in studying mesopelagic biogeochemistry. Here we present estimates of particulate transformations to dissolved iron, concurrent oxygen consumption and iron-binding ligand replenishment based on in situ mesopelagic experiments. Dissolved iron regeneration efficiencies (that is, replenishment over oxygen consumption) were 10- to 100-fold higher in low-dust subantarctic waters relative to higher-dust Mediterranean sites. Regeneration efficiencies are heavily influenced by particle composition. Their make-up dictates ligand release, controls scavenging, modulates ballasting and may lead to the differential remineralization of biogenic versus lithogenic iron. At high-dust sites, these processes together increase the iron remineralization length scale. Modelling reveals that in oceanic regions near deserts, enhanced lithogenic fluxes deepen the ferricline, which alter the vertical patterns of dissolved iron replenishment, and set its redistribution at the global scale. Such wide-ranging regeneration efficiencies drive different vertical patterns in dissolved iron replenishment across oceanic provinces. Article in Journal/Newspaper Southern Ocean Unknown Southern Ocean Nature Geoscience 12 12 995 1000 |