Dissolved cadmium in the Southern Ocean: Distribution, speciation, and relation to phosphate
International audience We report isotope dilution analyses of dissolved cadmium (Cd) and electrochemical Cd speciation measurements in the Atlantic sector of the Southern Ocean. Bioavailable inorganic Cd is > 100 times higher in near-surface waters south of the Polar Front compared to the Subanta...
Published in: | Limnology and Oceanography |
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Main Authors: | , , , , |
Other Authors: | , , , , , , , , , , , |
Format: | Article in Journal/Newspaper |
Language: | English |
Published: |
HAL CCSD
2014
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Subjects: | |
Online Access: | https://hal.univ-brest.fr/hal-01019759 https://hal.univ-brest.fr/hal-01019759/document https://hal.univ-brest.fr/hal-01019759/file/Baars_et_al_2014.pdf https://doi.org/10.4319/lo.2014.59.2.0385 |
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Archive ouverte HAL (Hyper Article en Ligne, CCSD - Centre pour la Communication Scientifique Directe) |
op_collection_id |
ftccsdartic |
language |
English |
topic |
nutrient limitation mode water ligand electrochemistry gyre bioavailability cadmium circumpolar current complexation concentration (composition) deep water dilution phosphate spatial distribution speciation (chemistry) upwelling Atlantic Sector Southern Ocean Weddell Sea ACL [SDU.OCEAN]Sciences of the Universe [physics]/Ocean Atmosphere [SDU.STU.GC]Sciences of the Universe [physics]/Earth Sciences/Geochemistry [SDE.MCG]Environmental Sciences/Global Changes [SDE.BE]Environmental Sciences/Biodiversity and Ecology |
spellingShingle |
nutrient limitation mode water ligand electrochemistry gyre bioavailability cadmium circumpolar current complexation concentration (composition) deep water dilution phosphate spatial distribution speciation (chemistry) upwelling Atlantic Sector Southern Ocean Weddell Sea ACL [SDU.OCEAN]Sciences of the Universe [physics]/Ocean Atmosphere [SDU.STU.GC]Sciences of the Universe [physics]/Earth Sciences/Geochemistry [SDE.MCG]Environmental Sciences/Global Changes [SDE.BE]Environmental Sciences/Biodiversity and Ecology Baars, O. Abouchami, W. Galer, S.J.G. Boye, Marie Croot, Peter Dissolved cadmium in the Southern Ocean: Distribution, speciation, and relation to phosphate |
topic_facet |
nutrient limitation mode water ligand electrochemistry gyre bioavailability cadmium circumpolar current complexation concentration (composition) deep water dilution phosphate spatial distribution speciation (chemistry) upwelling Atlantic Sector Southern Ocean Weddell Sea ACL [SDU.OCEAN]Sciences of the Universe [physics]/Ocean Atmosphere [SDU.STU.GC]Sciences of the Universe [physics]/Earth Sciences/Geochemistry [SDE.MCG]Environmental Sciences/Global Changes [SDE.BE]Environmental Sciences/Biodiversity and Ecology |
description |
International audience We report isotope dilution analyses of dissolved cadmium (Cd) and electrochemical Cd speciation measurements in the Atlantic sector of the Southern Ocean. Bioavailable inorganic Cd is > 100 times higher in near-surface waters south of the Polar Front compared to the Subantarctic Zone because of upwelling and reduced complexation by organic Cd ligands. To trace local changes in the relation between Cd and P, we examine the deviations from a linear deep-water Cd vs. P relation (Cd*), and find that changes in Cd* coincide with the position of frontal systems and covary with primary productivity and total dissolved Mn and Fe concentrations. These covariations agree with potential local changes in phytoplankton Cd uptake rates, resulting from differences in the availability of Cd, Zn, Mn, and Fe. A band of negative Cd* values is associated with formation of Subantarctic Mode Water (SAMW) and Antarctic Intermediate Water (AAIW). In contrast to SAMW, which may export low Cd: P ratios from the Southern Ocean, the Cd: P ratios in AAIW increase by mixing with underlying Upper Circumpolar Deep Water before being exported from the Southern Ocean. Deep waters show constant Cd: P ratios, and both elements behave conservatively with end-member mixing between deep waters of the Weddell Gyre, the Antarctic Circumpolar Current, and inflowing North Atlantic Deep Water. Overall, our results support the hypothesis that the kink in the global Cd vs. P relation is largely caused by high Cd: P uptake ratios in the trace-nutrient-limited Southern Ocean |
author2 |
Leibniz-Institut für Meereswissenschaften (IFM-GEOMAR) Department of Geosciences Princeton Princeton University Max Planck Institute for Chemistry (MPIC) Max-Planck-Gesellschaft Institut für Mineralogie Westfälische Wilhelms-Universität Münster (WWU) 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 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) Department of Earth and Ocean Sciences Galway National University of Ireland Galway (NUI Galway) |
format |
Article in Journal/Newspaper |
author |
Baars, O. Abouchami, W. Galer, S.J.G. Boye, Marie Croot, Peter |
author_facet |
Baars, O. Abouchami, W. Galer, S.J.G. Boye, Marie Croot, Peter |
author_sort |
Baars, O. |
title |
Dissolved cadmium in the Southern Ocean: Distribution, speciation, and relation to phosphate |
title_short |
Dissolved cadmium in the Southern Ocean: Distribution, speciation, and relation to phosphate |
title_full |
Dissolved cadmium in the Southern Ocean: Distribution, speciation, and relation to phosphate |
title_fullStr |
Dissolved cadmium in the Southern Ocean: Distribution, speciation, and relation to phosphate |
title_full_unstemmed |
Dissolved cadmium in the Southern Ocean: Distribution, speciation, and relation to phosphate |
title_sort |
dissolved cadmium in the southern ocean: distribution, speciation, and relation to phosphate |
publisher |
HAL CCSD |
publishDate |
2014 |
url |
https://hal.univ-brest.fr/hal-01019759 https://hal.univ-brest.fr/hal-01019759/document https://hal.univ-brest.fr/hal-01019759/file/Baars_et_al_2014.pdf https://doi.org/10.4319/lo.2014.59.2.0385 |
geographic |
Antarctic Southern Ocean The Antarctic Weddell Weddell Sea |
geographic_facet |
Antarctic Southern Ocean The Antarctic Weddell Weddell Sea |
genre |
Antarc* Antarctic North Atlantic Deep Water North Atlantic Southern Ocean Weddell Sea |
genre_facet |
Antarc* Antarctic North Atlantic Deep Water North Atlantic Southern Ocean Weddell Sea |
op_source |
ISSN: 0024-3590 EISSN: 1939-5590 Limnology and Oceanography https://hal.univ-brest.fr/hal-01019759 Limnology and Oceanography, Association for the Sciences of Limnology and Oceanography, 2014, 59 (2), pp.385-399. ⟨10.4319/lo.2014.59.2.0385⟩ |
op_relation |
info:eu-repo/semantics/altIdentifier/doi/10.4319/lo.2014.59.2.0385 hal-01019759 https://hal.univ-brest.fr/hal-01019759 https://hal.univ-brest.fr/hal-01019759/document https://hal.univ-brest.fr/hal-01019759/file/Baars_et_al_2014.pdf doi:10.4319/lo.2014.59.2.0385 |
op_rights |
info:eu-repo/semantics/OpenAccess |
op_doi |
https://doi.org/10.4319/lo.2014.59.2.0385 |
container_title |
Limnology and Oceanography |
container_volume |
59 |
container_issue |
2 |
container_start_page |
385 |
op_container_end_page |
399 |
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1766046122292281344 |
spelling |
ftccsdartic:oai:HAL:hal-01019759v1 2023-05-15T13:33:48+02:00 Dissolved cadmium in the Southern Ocean: Distribution, speciation, and relation to phosphate Baars, O. Abouchami, W. Galer, S.J.G. Boye, Marie Croot, Peter Leibniz-Institut für Meereswissenschaften (IFM-GEOMAR) Department of Geosciences Princeton Princeton University Max Planck Institute for Chemistry (MPIC) Max-Planck-Gesellschaft Institut für Mineralogie Westfälische Wilhelms-Universität Münster (WWU) 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 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) Department of Earth and Ocean Sciences Galway National University of Ireland Galway (NUI Galway) 2014-06-04 https://hal.univ-brest.fr/hal-01019759 https://hal.univ-brest.fr/hal-01019759/document https://hal.univ-brest.fr/hal-01019759/file/Baars_et_al_2014.pdf https://doi.org/10.4319/lo.2014.59.2.0385 en eng HAL CCSD Association for the Sciences of Limnology and Oceanography info:eu-repo/semantics/altIdentifier/doi/10.4319/lo.2014.59.2.0385 hal-01019759 https://hal.univ-brest.fr/hal-01019759 https://hal.univ-brest.fr/hal-01019759/document https://hal.univ-brest.fr/hal-01019759/file/Baars_et_al_2014.pdf doi:10.4319/lo.2014.59.2.0385 info:eu-repo/semantics/OpenAccess ISSN: 0024-3590 EISSN: 1939-5590 Limnology and Oceanography https://hal.univ-brest.fr/hal-01019759 Limnology and Oceanography, Association for the Sciences of Limnology and Oceanography, 2014, 59 (2), pp.385-399. ⟨10.4319/lo.2014.59.2.0385⟩ nutrient limitation mode water ligand electrochemistry gyre bioavailability cadmium circumpolar current complexation concentration (composition) deep water dilution phosphate spatial distribution speciation (chemistry) upwelling Atlantic Sector Southern Ocean Weddell Sea ACL [SDU.OCEAN]Sciences of the Universe [physics]/Ocean Atmosphere [SDU.STU.GC]Sciences of the Universe [physics]/Earth Sciences/Geochemistry [SDE.MCG]Environmental Sciences/Global Changes [SDE.BE]Environmental Sciences/Biodiversity and Ecology info:eu-repo/semantics/article Journal articles 2014 ftccsdartic https://doi.org/10.4319/lo.2014.59.2.0385 2021-12-19T03:03:51Z International audience We report isotope dilution analyses of dissolved cadmium (Cd) and electrochemical Cd speciation measurements in the Atlantic sector of the Southern Ocean. Bioavailable inorganic Cd is > 100 times higher in near-surface waters south of the Polar Front compared to the Subantarctic Zone because of upwelling and reduced complexation by organic Cd ligands. To trace local changes in the relation between Cd and P, we examine the deviations from a linear deep-water Cd vs. P relation (Cd*), and find that changes in Cd* coincide with the position of frontal systems and covary with primary productivity and total dissolved Mn and Fe concentrations. These covariations agree with potential local changes in phytoplankton Cd uptake rates, resulting from differences in the availability of Cd, Zn, Mn, and Fe. A band of negative Cd* values is associated with formation of Subantarctic Mode Water (SAMW) and Antarctic Intermediate Water (AAIW). In contrast to SAMW, which may export low Cd: P ratios from the Southern Ocean, the Cd: P ratios in AAIW increase by mixing with underlying Upper Circumpolar Deep Water before being exported from the Southern Ocean. Deep waters show constant Cd: P ratios, and both elements behave conservatively with end-member mixing between deep waters of the Weddell Gyre, the Antarctic Circumpolar Current, and inflowing North Atlantic Deep Water. Overall, our results support the hypothesis that the kink in the global Cd vs. P relation is largely caused by high Cd: P uptake ratios in the trace-nutrient-limited Southern Ocean Article in Journal/Newspaper Antarc* Antarctic North Atlantic Deep Water North Atlantic Southern Ocean Weddell Sea Archive ouverte HAL (Hyper Article en Ligne, CCSD - Centre pour la Communication Scientifique Directe) Antarctic Southern Ocean The Antarctic Weddell Weddell Sea Limnology and Oceanography 59 2 385 399 |