Sources of dissolved iron to oxygen minimum zone waters on the Senegalese continental margin in the tropical North Atlantic Ocean: Insights from iron isotopes
International audience Oxygen minimum zones (OMZs) cover extensive areas of eastern boundary ocean regions and play an important role in the cycling of the essential micronutrient iron (Fe). The isotopic composition of dissolved Fe (dFe) in shelf and slope waters on the Senegalese margin was determi...
Published in: | Geochimica et Cosmochimica Acta |
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Online Access: | https://hal.science/hal-03771965 https://hal.science/hal-03771965/document https://hal.science/hal-03771965/file/GCA-S-17-00837%282%29.pdf https://doi.org/10.1016/j.gca.2018.02.031 |
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ftccsdartic:oai:HAL:hal-03771965v1 2023-12-24T10:22:58+01:00 Sources of dissolved iron to oxygen minimum zone waters on the Senegalese continental margin in the tropical North Atlantic Ocean: Insights from iron isotopes Klar, J. K. Schlosser, C. Milton, J. A. Woodward, E. M. S. Lacan, F. Parkinson, I. J. Achterberg, E. P. James, R.H. National Oceanography Centre Southampton (NOC) University of Southampton Laboratoire d'études en Géophysique et océanographie spatiales (LEGOS) Institut de Recherche pour le Développement (IRD)-Université Toulouse III - Paul Sabatier (UT3) Université de Toulouse (UT)-Université de Toulouse (UT)-Institut national des sciences de l'Univers (INSU - CNRS)-Observatoire Midi-Pyrénées (OMP) Université de Toulouse (UT)-Université de Toulouse (UT)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National d'Études Spatiales Toulouse (CNES)-Centre National de la Recherche Scientifique (CNRS)-Météo-France-Institut de Recherche pour le Développement (IRD)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National d'Études Spatiales Toulouse (CNES)-Centre National de la Recherche Scientifique (CNRS)-Météo-France-Centre National de la Recherche Scientifique (CNRS) Helmholtz Centre for Ocean Research Kiel (GEOMAR) School of Earth Sciences Bristol University of Bristol Bristol 2018 https://hal.science/hal-03771965 https://hal.science/hal-03771965/document https://hal.science/hal-03771965/file/GCA-S-17-00837%282%29.pdf https://doi.org/10.1016/j.gca.2018.02.031 en eng HAL CCSD Elsevier info:eu-repo/semantics/altIdentifier/doi/10.1016/j.gca.2018.02.031 hal-03771965 https://hal.science/hal-03771965 https://hal.science/hal-03771965/document https://hal.science/hal-03771965/file/GCA-S-17-00837%282%29.pdf doi:10.1016/j.gca.2018.02.031 info:eu-repo/semantics/OpenAccess ISSN: 0016-7037 EISSN: 0016-7037 Geochimica et Cosmochimica Acta https://hal.science/hal-03771965 Geochimica et Cosmochimica Acta, 2018, 236, pp.60-78. ⟨10.1016/j.gca.2018.02.031⟩ tropical Atlantic Ocean iron isotopes oxygen minimum zone benthic iron remineralisation dissolved aluminium dust GEOTRACES [SDU.STU.OC]Sciences of the Universe [physics]/Earth Sciences/Oceanography [SDU.STU.GC]Sciences of the Universe [physics]/Earth Sciences/Geochemistry info:eu-repo/semantics/article Journal articles 2018 ftccsdartic https://doi.org/10.1016/j.gca.2018.02.031 2023-11-26T00:02:37Z International audience Oxygen minimum zones (OMZs) cover extensive areas of eastern boundary ocean regions and play an important role in the cycling of the essential micronutrient iron (Fe). The isotopic composition of dissolved Fe (dFe) in shelf and slope waters on the Senegalese margin was determined to investigate the processes leading to enhanced dFe concentrations (up to 2 nM) in this tropical North Atlantic OMZ. Our results show that benthic sources of Fe inputs, characterised by low 56 Fe down to-0.33 and recycled in the water column by remineralisation processes. We show that regeneration of sinking organic material becomes a more important dFe source with distance from the shelf and this remineralised dFe has relatively high 56 Fe Remineralisation plays an important role in in the redistribution of dFe that is mainly supplied by benthic and atmospheric inputs, although dust loading, calculated from dissolved aluminium-2 d-1). As OMZs are expected to expand, our data provide important insights into Fe sources and Fe cycling in the tropical North Atlantic Ocean. Article in Journal/Newspaper North Atlantic Archive ouverte HAL (Hyper Article en Ligne, CCSD - Centre pour la Communication Scientifique Directe) Geochimica et Cosmochimica Acta 236 60 78 |
institution |
Open Polar |
collection |
Archive ouverte HAL (Hyper Article en Ligne, CCSD - Centre pour la Communication Scientifique Directe) |
op_collection_id |
ftccsdartic |
language |
English |
topic |
tropical Atlantic Ocean iron isotopes oxygen minimum zone benthic iron remineralisation dissolved aluminium dust GEOTRACES [SDU.STU.OC]Sciences of the Universe [physics]/Earth Sciences/Oceanography [SDU.STU.GC]Sciences of the Universe [physics]/Earth Sciences/Geochemistry |
spellingShingle |
tropical Atlantic Ocean iron isotopes oxygen minimum zone benthic iron remineralisation dissolved aluminium dust GEOTRACES [SDU.STU.OC]Sciences of the Universe [physics]/Earth Sciences/Oceanography [SDU.STU.GC]Sciences of the Universe [physics]/Earth Sciences/Geochemistry Klar, J. K. Schlosser, C. Milton, J. A. Woodward, E. M. S. Lacan, F. Parkinson, I. J. Achterberg, E. P. James, R.H. Sources of dissolved iron to oxygen minimum zone waters on the Senegalese continental margin in the tropical North Atlantic Ocean: Insights from iron isotopes |
topic_facet |
tropical Atlantic Ocean iron isotopes oxygen minimum zone benthic iron remineralisation dissolved aluminium dust GEOTRACES [SDU.STU.OC]Sciences of the Universe [physics]/Earth Sciences/Oceanography [SDU.STU.GC]Sciences of the Universe [physics]/Earth Sciences/Geochemistry |
description |
International audience Oxygen minimum zones (OMZs) cover extensive areas of eastern boundary ocean regions and play an important role in the cycling of the essential micronutrient iron (Fe). The isotopic composition of dissolved Fe (dFe) in shelf and slope waters on the Senegalese margin was determined to investigate the processes leading to enhanced dFe concentrations (up to 2 nM) in this tropical North Atlantic OMZ. Our results show that benthic sources of Fe inputs, characterised by low 56 Fe down to-0.33 and recycled in the water column by remineralisation processes. We show that regeneration of sinking organic material becomes a more important dFe source with distance from the shelf and this remineralised dFe has relatively high 56 Fe Remineralisation plays an important role in in the redistribution of dFe that is mainly supplied by benthic and atmospheric inputs, although dust loading, calculated from dissolved aluminium-2 d-1). As OMZs are expected to expand, our data provide important insights into Fe sources and Fe cycling in the tropical North Atlantic Ocean. |
author2 |
National Oceanography Centre Southampton (NOC) University of Southampton Laboratoire d'études en Géophysique et océanographie spatiales (LEGOS) Institut de Recherche pour le Développement (IRD)-Université Toulouse III - Paul Sabatier (UT3) Université de Toulouse (UT)-Université de Toulouse (UT)-Institut national des sciences de l'Univers (INSU - CNRS)-Observatoire Midi-Pyrénées (OMP) Université de Toulouse (UT)-Université de Toulouse (UT)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National d'Études Spatiales Toulouse (CNES)-Centre National de la Recherche Scientifique (CNRS)-Météo-France-Institut de Recherche pour le Développement (IRD)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National d'Études Spatiales Toulouse (CNES)-Centre National de la Recherche Scientifique (CNRS)-Météo-France-Centre National de la Recherche Scientifique (CNRS) Helmholtz Centre for Ocean Research Kiel (GEOMAR) School of Earth Sciences Bristol University of Bristol Bristol |
format |
Article in Journal/Newspaper |
author |
Klar, J. K. Schlosser, C. Milton, J. A. Woodward, E. M. S. Lacan, F. Parkinson, I. J. Achterberg, E. P. James, R.H. |
author_facet |
Klar, J. K. Schlosser, C. Milton, J. A. Woodward, E. M. S. Lacan, F. Parkinson, I. J. Achterberg, E. P. James, R.H. |
author_sort |
Klar, J. K. |
title |
Sources of dissolved iron to oxygen minimum zone waters on the Senegalese continental margin in the tropical North Atlantic Ocean: Insights from iron isotopes |
title_short |
Sources of dissolved iron to oxygen minimum zone waters on the Senegalese continental margin in the tropical North Atlantic Ocean: Insights from iron isotopes |
title_full |
Sources of dissolved iron to oxygen minimum zone waters on the Senegalese continental margin in the tropical North Atlantic Ocean: Insights from iron isotopes |
title_fullStr |
Sources of dissolved iron to oxygen minimum zone waters on the Senegalese continental margin in the tropical North Atlantic Ocean: Insights from iron isotopes |
title_full_unstemmed |
Sources of dissolved iron to oxygen minimum zone waters on the Senegalese continental margin in the tropical North Atlantic Ocean: Insights from iron isotopes |
title_sort |
sources of dissolved iron to oxygen minimum zone waters on the senegalese continental margin in the tropical north atlantic ocean: insights from iron isotopes |
publisher |
HAL CCSD |
publishDate |
2018 |
url |
https://hal.science/hal-03771965 https://hal.science/hal-03771965/document https://hal.science/hal-03771965/file/GCA-S-17-00837%282%29.pdf https://doi.org/10.1016/j.gca.2018.02.031 |
genre |
North Atlantic |
genre_facet |
North Atlantic |
op_source |
ISSN: 0016-7037 EISSN: 0016-7037 Geochimica et Cosmochimica Acta https://hal.science/hal-03771965 Geochimica et Cosmochimica Acta, 2018, 236, pp.60-78. ⟨10.1016/j.gca.2018.02.031⟩ |
op_relation |
info:eu-repo/semantics/altIdentifier/doi/10.1016/j.gca.2018.02.031 hal-03771965 https://hal.science/hal-03771965 https://hal.science/hal-03771965/document https://hal.science/hal-03771965/file/GCA-S-17-00837%282%29.pdf doi:10.1016/j.gca.2018.02.031 |
op_rights |
info:eu-repo/semantics/OpenAccess |
op_doi |
https://doi.org/10.1016/j.gca.2018.02.031 |
container_title |
Geochimica et Cosmochimica Acta |
container_volume |
236 |
container_start_page |
60 |
op_container_end_page |
78 |
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1786196585263136768 |