Significant portion of dissolved organic Fe complexes in fact is Fe colloids
International audience Vertical distributions of iron and iron binding ligands were determined in 2 size classes (dissolved < 0.2 μm, soluble < 200 kDa, e.g., ~ 0.03 μm) in the Southern Ocean. Colloidal iron and complexing capacity (> 200 kDa-< 0.2 μm) were inferred as the difference bet...
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Online Access: | https://hal.science/hal-00669727 https://doi.org/10.1016/j.marchem.2010.09.001 |
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ftinsu:oai:HAL:hal-00669727v1 2024-02-11T10:08:50+01:00 Significant portion of dissolved organic Fe complexes in fact is Fe colloids Boye, Marie Nishioka, Jun Croot, Peter, L. Laan, Patrick Timmermans, K.R. Strass, Volker H. Takeda, Shigenobu de Baar, H. J. W. 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) Royal Netherlands Institute for Sea Research (NIOZ) Institute of Low Temperature Science Sapporo Hokkaido University Sapporo, Japan Leibniz-Institut für Meereswissenschaften (IFM-GEOMAR) Alfred-Wegener-Institut, Helmholtz-Zentrum für Polar- und Meeresforschung = Alfred Wegener Institute for Polar and Marine Research = Institut Alfred-Wegener pour la recherche polaire et marine (AWI) Helmholtz-Gemeinschaft = Helmholtz Association Department of Aquatic Bioscience The University of Tokyo (UTokyo) 2010-10-14 https://hal.science/hal-00669727 https://doi.org/10.1016/j.marchem.2010.09.001 en eng HAL CCSD Elsevier info:eu-repo/semantics/altIdentifier/doi/10.1016/j.marchem.2010.09.001 hal-00669727 https://hal.science/hal-00669727 doi:10.1016/j.marchem.2010.09.001 ISSN: 0304-4203 Marine Chemistry https://hal.science/hal-00669727 Marine Chemistry, 2010, 122 (1-4), pp.20-27. ⟨10.1016/j.marchem.2010.09.001⟩ Iron Size fractionation Complexation Southern Ocean [SDE]Environmental Sciences info:eu-repo/semantics/article Journal articles 2010 ftinsu https://doi.org/10.1016/j.marchem.2010.09.001 2024-01-24T17:23:45Z International audience Vertical distributions of iron and iron binding ligands were determined in 2 size classes (dissolved < 0.2 μm, soluble < 200 kDa, e.g., ~ 0.03 μm) in the Southern Ocean. Colloidal iron and complexing capacity (> 200 kDa-< 0.2 μm) were inferred as the difference between the dissolved and soluble fractions. Dissolved iron and ligands exist primarily in the soluble size range in the surface waters, although iron-complexing colloids still represent a significant portion of the dissolved pool and this fraction increases markedly with depth. This work presents evidence for the colloidal nature of a significant portion (37-51% on average) of the 'dissolved' organic Fe pool in these oceanic waters. From the data it was not possible to discern whether iron colloids exist as discrete organic complexes and/or inorganic amorphous colloids. Iron-complexing colloids are the most saturated with iron at the thermodynamic equilibrium, whereas soluble organic ligands occur in larger excess compared to soluble iron. It suggests that the exchangeable fraction for iron uptake through dissociation of Fe complexes likely occurs in the soluble fraction, and that soluble ligands have the potential to buffer iron inputs to surface waters whereas iron colloids may aggregate and settle. Expectations based on Fe diffusion rates, distributions and the stability of the soluble iron complexes and iron colloids also suggest that the weaker soluble Fe complexes may be more bio-available, while the strongest colloids may be a major route for iron removal from oceanic waters. Investigations of the size classes of the dissolved organic iron thus can significantly increase our understanding of the oceanic iron cycle. Article in Journal/Newspaper Southern Ocean Institut national des sciences de l'Univers: HAL-INSU Southern Ocean Marine Chemistry 122 1-4 20 27 |
institution |
Open Polar |
collection |
Institut national des sciences de l'Univers: HAL-INSU |
op_collection_id |
ftinsu |
language |
English |
topic |
Iron Size fractionation Complexation Southern Ocean [SDE]Environmental Sciences |
spellingShingle |
Iron Size fractionation Complexation Southern Ocean [SDE]Environmental Sciences Boye, Marie Nishioka, Jun Croot, Peter, L. Laan, Patrick Timmermans, K.R. Strass, Volker H. Takeda, Shigenobu de Baar, H. J. W. Significant portion of dissolved organic Fe complexes in fact is Fe colloids |
topic_facet |
Iron Size fractionation Complexation Southern Ocean [SDE]Environmental Sciences |
description |
International audience Vertical distributions of iron and iron binding ligands were determined in 2 size classes (dissolved < 0.2 μm, soluble < 200 kDa, e.g., ~ 0.03 μm) in the Southern Ocean. Colloidal iron and complexing capacity (> 200 kDa-< 0.2 μm) were inferred as the difference between the dissolved and soluble fractions. Dissolved iron and ligands exist primarily in the soluble size range in the surface waters, although iron-complexing colloids still represent a significant portion of the dissolved pool and this fraction increases markedly with depth. This work presents evidence for the colloidal nature of a significant portion (37-51% on average) of the 'dissolved' organic Fe pool in these oceanic waters. From the data it was not possible to discern whether iron colloids exist as discrete organic complexes and/or inorganic amorphous colloids. Iron-complexing colloids are the most saturated with iron at the thermodynamic equilibrium, whereas soluble organic ligands occur in larger excess compared to soluble iron. It suggests that the exchangeable fraction for iron uptake through dissociation of Fe complexes likely occurs in the soluble fraction, and that soluble ligands have the potential to buffer iron inputs to surface waters whereas iron colloids may aggregate and settle. Expectations based on Fe diffusion rates, distributions and the stability of the soluble iron complexes and iron colloids also suggest that the weaker soluble Fe complexes may be more bio-available, while the strongest colloids may be a major route for iron removal from oceanic waters. Investigations of the size classes of the dissolved organic iron thus can significantly increase our understanding of the oceanic iron cycle. |
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) Royal Netherlands Institute for Sea Research (NIOZ) Institute of Low Temperature Science Sapporo Hokkaido University Sapporo, Japan Leibniz-Institut für Meereswissenschaften (IFM-GEOMAR) Alfred-Wegener-Institut, Helmholtz-Zentrum für Polar- und Meeresforschung = Alfred Wegener Institute for Polar and Marine Research = Institut Alfred-Wegener pour la recherche polaire et marine (AWI) Helmholtz-Gemeinschaft = Helmholtz Association Department of Aquatic Bioscience The University of Tokyo (UTokyo) |
format |
Article in Journal/Newspaper |
author |
Boye, Marie Nishioka, Jun Croot, Peter, L. Laan, Patrick Timmermans, K.R. Strass, Volker H. Takeda, Shigenobu de Baar, H. J. W. |
author_facet |
Boye, Marie Nishioka, Jun Croot, Peter, L. Laan, Patrick Timmermans, K.R. Strass, Volker H. Takeda, Shigenobu de Baar, H. J. W. |
author_sort |
Boye, Marie |
title |
Significant portion of dissolved organic Fe complexes in fact is Fe colloids |
title_short |
Significant portion of dissolved organic Fe complexes in fact is Fe colloids |
title_full |
Significant portion of dissolved organic Fe complexes in fact is Fe colloids |
title_fullStr |
Significant portion of dissolved organic Fe complexes in fact is Fe colloids |
title_full_unstemmed |
Significant portion of dissolved organic Fe complexes in fact is Fe colloids |
title_sort |
significant portion of dissolved organic fe complexes in fact is fe colloids |
publisher |
HAL CCSD |
publishDate |
2010 |
url |
https://hal.science/hal-00669727 https://doi.org/10.1016/j.marchem.2010.09.001 |
geographic |
Southern Ocean |
geographic_facet |
Southern Ocean |
genre |
Southern Ocean |
genre_facet |
Southern Ocean |
op_source |
ISSN: 0304-4203 Marine Chemistry https://hal.science/hal-00669727 Marine Chemistry, 2010, 122 (1-4), pp.20-27. ⟨10.1016/j.marchem.2010.09.001⟩ |
op_relation |
info:eu-repo/semantics/altIdentifier/doi/10.1016/j.marchem.2010.09.001 hal-00669727 https://hal.science/hal-00669727 doi:10.1016/j.marchem.2010.09.001 |
op_doi |
https://doi.org/10.1016/j.marchem.2010.09.001 |
container_title |
Marine Chemistry |
container_volume |
122 |
container_issue |
1-4 |
container_start_page |
20 |
op_container_end_page |
27 |
_version_ |
1790608442543570944 |