Dissolved concentrations and organic speciation of copper in the Amazon River estuary and mixing plume
International audience The Amazon is Earth's largest river by volume output, making it an important source of trace metals and dissolved organic matter (DOM) to the Atlantic Ocean. Despite major recent anthropogenic disruptions to the Amazon catchment area, data for trace metals such as copper...
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Online Access: | https://hal.univ-brest.fr/hal-03326537 https://doi.org/10.1016/j.marchem.2021.104005 |
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ftccsdartic:oai:HAL:hal-03326537v1 2023-05-15T17:35:46+02:00 Dissolved concentrations and organic speciation of copper in the Amazon River estuary and mixing plume Hollister, Adrienne Patricia whitby, hannah Seidel, Michael Lodeiro, Pablo Gledhill, Martha Koschinsky, Andrea 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) ANR-10-LABX-0019,LabexMER,LabexMER Marine Excellence Research: a changing ocean(2010) 2021-08 https://hal.univ-brest.fr/hal-03326537 https://doi.org/10.1016/j.marchem.2021.104005 en eng HAL CCSD Elsevier info:eu-repo/semantics/altIdentifier/doi/10.1016/j.marchem.2021.104005 hal-03326537 https://hal.univ-brest.fr/hal-03326537 doi:10.1016/j.marchem.2021.104005 ISSN: 0304-4203 Marine Chemistry https://hal.univ-brest.fr/hal-03326537 Marine Chemistry, Elsevier, 2021, 234, pp.104005. ⟨10.1016/j.marchem.2021.104005⟩ Chemical speciation Dissolved organic carbon Stripping analysis Trace metals [SDE]Environmental Sciences info:eu-repo/semantics/article Journal articles 2021 ftccsdartic https://doi.org/10.1016/j.marchem.2021.104005 2022-01-09T00:13:33Z International audience The Amazon is Earth's largest river by volume output, making it an important source of trace metals and dissolved organic matter (DOM) to the Atlantic Ocean. Despite major recent anthropogenic disruptions to the Amazon catchment area, data for trace metals such as copper (Cu) in the Amazon River estuary and associated mixing plume are still rare. Furthermore, there is currently no existing data in this region for Cu-binding ligands, which govern the amount of bioavailable Cu. To understand trace metal mixing and transport processes, the GEOTRACES process study GApr11 (cruise M147 with RV Meteor) was conducted in 2018 in the Amazon and Pará River estuaries and mixing plume in the tropical North Atlantic Ocean during high river discharge. Size-fractionated surface samples were collected along the full salinity gradient for concentrations of Cu, apparent Cu-binding organic ligands (LCu) and corresponding conditional stability constants (K′CuL, Cu2+cond), electroactive humic substances (eHS), solid phase extractable organic Cu (SPE[sbnd]Cu), dissolved organic carbon (DOC), chlorophyll a (Chl a) and macronutrients. Dissolved (<0.2 μm) and soluble (<0.015 μm) Cu correlated negatively with salinity and largely followed values expected from conservative mixing. Cu was primarily in the soluble fraction, with the exception of a minor fraction of large colloidal Cu at low salinity (S ≤ 10). Organic ligands (log K′CuL, Cu2+cond = 12.6–15.6) were present in excess of Cu and likely played a role in solubilizing Cu and preventing Cu being affected by colloidal flocculation. Cu-associated DOM (measured as LCu, eHS and SPE[sbnd]Cu) correlated negatively with salinity and appeared to be primarily governed by river input and mixing with seawater. However, an increase in the colloidal fraction for LCu and eHS observed at S ~ 6–10 was attributed to possible additional autochthonous (phytoplankton) ligand production. In all dissolved samples, organic complexation kept free Cu below levels potentially ... Article in Journal/Newspaper North Atlantic Archive ouverte HAL (Hyper Article en Ligne, CCSD - Centre pour la Communication Scientifique Directe) Marine Chemistry 234 104005 |
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 |
Chemical speciation Dissolved organic carbon Stripping analysis Trace metals [SDE]Environmental Sciences |
spellingShingle |
Chemical speciation Dissolved organic carbon Stripping analysis Trace metals [SDE]Environmental Sciences Hollister, Adrienne Patricia whitby, hannah Seidel, Michael Lodeiro, Pablo Gledhill, Martha Koschinsky, Andrea Dissolved concentrations and organic speciation of copper in the Amazon River estuary and mixing plume |
topic_facet |
Chemical speciation Dissolved organic carbon Stripping analysis Trace metals [SDE]Environmental Sciences |
description |
International audience The Amazon is Earth's largest river by volume output, making it an important source of trace metals and dissolved organic matter (DOM) to the Atlantic Ocean. Despite major recent anthropogenic disruptions to the Amazon catchment area, data for trace metals such as copper (Cu) in the Amazon River estuary and associated mixing plume are still rare. Furthermore, there is currently no existing data in this region for Cu-binding ligands, which govern the amount of bioavailable Cu. To understand trace metal mixing and transport processes, the GEOTRACES process study GApr11 (cruise M147 with RV Meteor) was conducted in 2018 in the Amazon and Pará River estuaries and mixing plume in the tropical North Atlantic Ocean during high river discharge. Size-fractionated surface samples were collected along the full salinity gradient for concentrations of Cu, apparent Cu-binding organic ligands (LCu) and corresponding conditional stability constants (K′CuL, Cu2+cond), electroactive humic substances (eHS), solid phase extractable organic Cu (SPE[sbnd]Cu), dissolved organic carbon (DOC), chlorophyll a (Chl a) and macronutrients. Dissolved (<0.2 μm) and soluble (<0.015 μm) Cu correlated negatively with salinity and largely followed values expected from conservative mixing. Cu was primarily in the soluble fraction, with the exception of a minor fraction of large colloidal Cu at low salinity (S ≤ 10). Organic ligands (log K′CuL, Cu2+cond = 12.6–15.6) were present in excess of Cu and likely played a role in solubilizing Cu and preventing Cu being affected by colloidal flocculation. Cu-associated DOM (measured as LCu, eHS and SPE[sbnd]Cu) correlated negatively with salinity and appeared to be primarily governed by river input and mixing with seawater. However, an increase in the colloidal fraction for LCu and eHS observed at S ~ 6–10 was attributed to possible additional autochthonous (phytoplankton) ligand production. In all dissolved samples, organic complexation kept free Cu below levels potentially ... |
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 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) ANR-10-LABX-0019,LabexMER,LabexMER Marine Excellence Research: a changing ocean(2010) |
format |
Article in Journal/Newspaper |
author |
Hollister, Adrienne Patricia whitby, hannah Seidel, Michael Lodeiro, Pablo Gledhill, Martha Koschinsky, Andrea |
author_facet |
Hollister, Adrienne Patricia whitby, hannah Seidel, Michael Lodeiro, Pablo Gledhill, Martha Koschinsky, Andrea |
author_sort |
Hollister, Adrienne Patricia |
title |
Dissolved concentrations and organic speciation of copper in the Amazon River estuary and mixing plume |
title_short |
Dissolved concentrations and organic speciation of copper in the Amazon River estuary and mixing plume |
title_full |
Dissolved concentrations and organic speciation of copper in the Amazon River estuary and mixing plume |
title_fullStr |
Dissolved concentrations and organic speciation of copper in the Amazon River estuary and mixing plume |
title_full_unstemmed |
Dissolved concentrations and organic speciation of copper in the Amazon River estuary and mixing plume |
title_sort |
dissolved concentrations and organic speciation of copper in the amazon river estuary and mixing plume |
publisher |
HAL CCSD |
publishDate |
2021 |
url |
https://hal.univ-brest.fr/hal-03326537 https://doi.org/10.1016/j.marchem.2021.104005 |
genre |
North Atlantic |
genre_facet |
North Atlantic |
op_source |
ISSN: 0304-4203 Marine Chemistry https://hal.univ-brest.fr/hal-03326537 Marine Chemistry, Elsevier, 2021, 234, pp.104005. ⟨10.1016/j.marchem.2021.104005⟩ |
op_relation |
info:eu-repo/semantics/altIdentifier/doi/10.1016/j.marchem.2021.104005 hal-03326537 https://hal.univ-brest.fr/hal-03326537 doi:10.1016/j.marchem.2021.104005 |
op_doi |
https://doi.org/10.1016/j.marchem.2021.104005 |
container_title |
Marine Chemistry |
container_volume |
234 |
container_start_page |
104005 |
_version_ |
1766135035122941952 |