Influence of atmospheric inputs on the iron distribution in the subtropical North-East Atlantic Ocean
International audience Aerosol (soluble and total) iron and water-column dissolved (DFe, < 0.2 μm) and total dissolvable (TDFe, unfiltered) iron concentrations were determined in the Canary Basin and along a transect towards the Strait of Gibraltar, in order to sample across the Saharan dust plum...
Published in: | Marine Chemistry |
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Main Authors: | , , , , , , , , , |
Other Authors: | , , , , , , , , , , , |
Format: | Article in Journal/Newspaper |
Language: | English |
Published: |
HAL CCSD
2007
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Subjects: | |
Online Access: | https://hal.univ-brest.fr/hal-00456419 https://doi.org/10.1016/j.marchem.2006.11.004 |
id |
ftinsu:oai:HAL:hal-00456419v1 |
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record_format |
openpolar |
institution |
Open Polar |
collection |
Institut national des sciences de l'Univers: HAL-INSU |
op_collection_id |
ftinsu |
language |
English |
topic |
Dissolved iron Total dissolvable iron Aerosol deposition Solubility Scavenging Regional terms: North-East Atlantic Canary Basin Madeira Gibraltar [SDU.STU.OC]Sciences of the Universe [physics]/Earth Sciences/Oceanography |
spellingShingle |
Dissolved iron Total dissolvable iron Aerosol deposition Solubility Scavenging Regional terms: North-East Atlantic Canary Basin Madeira Gibraltar [SDU.STU.OC]Sciences of the Universe [physics]/Earth Sciences/Oceanography Sarthou, Géraldine Baker, Alex R. Kramer, Jurjen Laan, Patrick Laës, A. Ussher, Simon J. Achterberg, E. P. de Baar, H. J. W. Timmermans, K.R. Blain, Stéphane Influence of atmospheric inputs on the iron distribution in the subtropical North-East Atlantic Ocean |
topic_facet |
Dissolved iron Total dissolvable iron Aerosol deposition Solubility Scavenging Regional terms: North-East Atlantic Canary Basin Madeira Gibraltar [SDU.STU.OC]Sciences of the Universe [physics]/Earth Sciences/Oceanography |
description |
International audience Aerosol (soluble and total) iron and water-column dissolved (DFe, < 0.2 μm) and total dissolvable (TDFe, unfiltered) iron concentrations were determined in the Canary Basin and along a transect towards the Strait of Gibraltar, in order to sample across the Saharan dust plume. Cumulative dust deposition fluxes estimated from direct aerosol sampling during our one-month cruise are representative of the estimated deposition fluxes based on near surface water dissolved aluminium concentrations measured on board. Iron inventories in near surface waters combined with flux estimates confirmed the relatively short residence time of DFe in waters influenced by the Saharan dust plume (6–14 months). Enhanced near surface water concentrations of DFe (5.90–6.99 nM) were observed at the Strait of Gibraltar mainly due to inputs from metal-rich rivers. In the Canary Basin and the transect towards Gibraltar, DFe concentrations (0.07–0.76 nM) were typical of concentrations observed in the surface North Atlantic Waters, with the highest concentrations associated with higher atmospheric inputs in the Canary Basin. Depth profiles showed that DFe and TDFe were influenced by atmospheric inputs in this area with an accumulation of aeolian Fe in the surface waters. The sub-surface minimum of both DFe and TDFe suggests that a simple partitioning between dissolved and particulate Fe is not obvious there and that export may occur for both phases. At depths of around 1000–1300 m, both regeneration and Meddies may explain the observed maximum. Our data suggest that, in deep waters, higher particle concentrations likely due to dust storms may increase the scavenging flux and thus decrease DFe concentrations in deep waters. |
author2 |
Laboratoire des Sciences de l'Environnement Marin (LEMAR) (LEMAR) Institut de Recherche pour le Développement (IRD)-Institut Français de Recherche pour l'Exploitation de la Mer (IFREMER)-Université de Brest (UBO)-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)-Centre National de la Recherche Scientifique (CNRS) School of Environmental Sciences Norwich University of East Anglia Norwich (UEA) Royal Netherlands Institute for Sea Research (NIOZ) School of Earth, Ocean and Environmental Sciences Plymouth Plymouth University National Oceanography Centre Southampton (NOC) University of Southampton Laboratoire d'océanographie et de biogéochimie (LOB) Université de la Méditerranée - Aix-Marseille 2-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS) |
format |
Article in Journal/Newspaper |
author |
Sarthou, Géraldine Baker, Alex R. Kramer, Jurjen Laan, Patrick Laës, A. Ussher, Simon J. Achterberg, E. P. de Baar, H. J. W. Timmermans, K.R. Blain, Stéphane |
author_facet |
Sarthou, Géraldine Baker, Alex R. Kramer, Jurjen Laan, Patrick Laës, A. Ussher, Simon J. Achterberg, E. P. de Baar, H. J. W. Timmermans, K.R. Blain, Stéphane |
author_sort |
Sarthou, Géraldine |
title |
Influence of atmospheric inputs on the iron distribution in the subtropical North-East Atlantic Ocean |
title_short |
Influence of atmospheric inputs on the iron distribution in the subtropical North-East Atlantic Ocean |
title_full |
Influence of atmospheric inputs on the iron distribution in the subtropical North-East Atlantic Ocean |
title_fullStr |
Influence of atmospheric inputs on the iron distribution in the subtropical North-East Atlantic Ocean |
title_full_unstemmed |
Influence of atmospheric inputs on the iron distribution in the subtropical North-East Atlantic Ocean |
title_sort |
influence of atmospheric inputs on the iron distribution in the subtropical north-east atlantic ocean |
publisher |
HAL CCSD |
publishDate |
2007 |
url |
https://hal.univ-brest.fr/hal-00456419 https://doi.org/10.1016/j.marchem.2006.11.004 |
genre |
North Atlantic North East Atlantic |
genre_facet |
North Atlantic North East Atlantic |
op_source |
ISSN: 0304-4203 Marine Chemistry https://hal.univ-brest.fr/hal-00456419 Marine Chemistry, 2007, 104 (3-4), pp.186-202. ⟨10.1016/j.marchem.2006.11.004⟩ |
op_relation |
info:eu-repo/semantics/altIdentifier/doi/10.1016/j.marchem.2006.11.004 hal-00456419 https://hal.univ-brest.fr/hal-00456419 doi:10.1016/j.marchem.2006.11.004 |
op_doi |
https://doi.org/10.1016/j.marchem.2006.11.004 |
container_title |
Marine Chemistry |
container_volume |
104 |
container_issue |
3-4 |
container_start_page |
186 |
op_container_end_page |
202 |
_version_ |
1790604438028681216 |
spelling |
ftinsu:oai:HAL:hal-00456419v1 2024-02-11T10:06:37+01:00 Influence of atmospheric inputs on the iron distribution in the subtropical North-East Atlantic Ocean Sarthou, Géraldine Baker, Alex R. Kramer, Jurjen Laan, Patrick Laës, A. Ussher, Simon J. Achterberg, E. P. de Baar, H. J. W. Timmermans, K.R. Blain, Stéphane Laboratoire des Sciences de l'Environnement Marin (LEMAR) (LEMAR) Institut de Recherche pour le Développement (IRD)-Institut Français de Recherche pour l'Exploitation de la Mer (IFREMER)-Université de Brest (UBO)-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)-Centre National de la Recherche Scientifique (CNRS) School of Environmental Sciences Norwich University of East Anglia Norwich (UEA) Royal Netherlands Institute for Sea Research (NIOZ) School of Earth, Ocean and Environmental Sciences Plymouth Plymouth University National Oceanography Centre Southampton (NOC) University of Southampton Laboratoire d'océanographie et de biogéochimie (LOB) Université de la Méditerranée - Aix-Marseille 2-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS) 2007-01-09 https://hal.univ-brest.fr/hal-00456419 https://doi.org/10.1016/j.marchem.2006.11.004 en eng HAL CCSD Elsevier info:eu-repo/semantics/altIdentifier/doi/10.1016/j.marchem.2006.11.004 hal-00456419 https://hal.univ-brest.fr/hal-00456419 doi:10.1016/j.marchem.2006.11.004 ISSN: 0304-4203 Marine Chemistry https://hal.univ-brest.fr/hal-00456419 Marine Chemistry, 2007, 104 (3-4), pp.186-202. ⟨10.1016/j.marchem.2006.11.004⟩ Dissolved iron Total dissolvable iron Aerosol deposition Solubility Scavenging Regional terms: North-East Atlantic Canary Basin Madeira Gibraltar [SDU.STU.OC]Sciences of the Universe [physics]/Earth Sciences/Oceanography info:eu-repo/semantics/article Journal articles 2007 ftinsu https://doi.org/10.1016/j.marchem.2006.11.004 2024-01-24T17:24:40Z International audience Aerosol (soluble and total) iron and water-column dissolved (DFe, < 0.2 μm) and total dissolvable (TDFe, unfiltered) iron concentrations were determined in the Canary Basin and along a transect towards the Strait of Gibraltar, in order to sample across the Saharan dust plume. Cumulative dust deposition fluxes estimated from direct aerosol sampling during our one-month cruise are representative of the estimated deposition fluxes based on near surface water dissolved aluminium concentrations measured on board. Iron inventories in near surface waters combined with flux estimates confirmed the relatively short residence time of DFe in waters influenced by the Saharan dust plume (6–14 months). Enhanced near surface water concentrations of DFe (5.90–6.99 nM) were observed at the Strait of Gibraltar mainly due to inputs from metal-rich rivers. In the Canary Basin and the transect towards Gibraltar, DFe concentrations (0.07–0.76 nM) were typical of concentrations observed in the surface North Atlantic Waters, with the highest concentrations associated with higher atmospheric inputs in the Canary Basin. Depth profiles showed that DFe and TDFe were influenced by atmospheric inputs in this area with an accumulation of aeolian Fe in the surface waters. The sub-surface minimum of both DFe and TDFe suggests that a simple partitioning between dissolved and particulate Fe is not obvious there and that export may occur for both phases. At depths of around 1000–1300 m, both regeneration and Meddies may explain the observed maximum. Our data suggest that, in deep waters, higher particle concentrations likely due to dust storms may increase the scavenging flux and thus decrease DFe concentrations in deep waters. Article in Journal/Newspaper North Atlantic North East Atlantic Institut national des sciences de l'Univers: HAL-INSU Marine Chemistry 104 3-4 186 202 |