Dissolved concentrations and organic speciation of copper in the Amazon River estuary and mixing plume
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 Rive...
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Online Access: | https://oceanrep.geomar.de/id/eprint/53561/ https://oceanrep.geomar.de/id/eprint/53561/1/Hollister%20et%20al%202021%20Main%20Text.pdf https://doi.org/10.1016/j.marchem.2021.104005 |
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ftoceanrep:oai:oceanrep.geomar.de:53561 2024-02-11T10:06:41+01:00 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 2021-08-20 text https://oceanrep.geomar.de/id/eprint/53561/ https://oceanrep.geomar.de/id/eprint/53561/1/Hollister%20et%20al%202021%20Main%20Text.pdf https://doi.org/10.1016/j.marchem.2021.104005 en eng Elsevier https://oceanrep.geomar.de/id/eprint/53561/1/Hollister%20et%20al%202021%20Main%20Text.pdf Hollister, A. P., Whitby, H., Seidel, M., Lodeiro, P. , Gledhill, M. and Koschinsky, A. (2021) Dissolved concentrations and organic speciation of copper in the Amazon River estuary and mixing plume. Open Access Marine Chemistry, 234 . Art.Nr. 104005. DOI 10.1016/j.marchem.2021.104005 <https://doi.org/10.1016/j.marchem.2021.104005>. doi:10.1016/j.marchem.2021.104005 cc_by_nc_nd_4.0 info:eu-repo/semantics/openAccess Article PeerReviewed 2021 ftoceanrep https://doi.org/10.1016/j.marchem.2021.104005 2024-01-15T00:23:45Z 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 toxic for phytoplankton ... Article in Journal/Newspaper North Atlantic OceanRep (GEOMAR Helmholtz Centre für Ocean Research Kiel) Marine Chemistry 234 104005 |
institution |
Open Polar |
collection |
OceanRep (GEOMAR Helmholtz Centre für Ocean Research Kiel) |
op_collection_id |
ftoceanrep |
language |
English |
description |
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 toxic for phytoplankton ... |
format |
Article in Journal/Newspaper |
author |
Hollister, Adrienne Patricia Whitby, Hannah Seidel, Michael Lodeiro, Pablo Gledhill, Martha Koschinsky, Andrea |
spellingShingle |
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 |
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 |
Elsevier |
publishDate |
2021 |
url |
https://oceanrep.geomar.de/id/eprint/53561/ https://oceanrep.geomar.de/id/eprint/53561/1/Hollister%20et%20al%202021%20Main%20Text.pdf https://doi.org/10.1016/j.marchem.2021.104005 |
genre |
North Atlantic |
genre_facet |
North Atlantic |
op_relation |
https://oceanrep.geomar.de/id/eprint/53561/1/Hollister%20et%20al%202021%20Main%20Text.pdf Hollister, A. P., Whitby, H., Seidel, M., Lodeiro, P. , Gledhill, M. and Koschinsky, A. (2021) Dissolved concentrations and organic speciation of copper in the Amazon River estuary and mixing plume. Open Access Marine Chemistry, 234 . Art.Nr. 104005. DOI 10.1016/j.marchem.2021.104005 <https://doi.org/10.1016/j.marchem.2021.104005>. doi:10.1016/j.marchem.2021.104005 |
op_rights |
cc_by_nc_nd_4.0 info:eu-repo/semantics/openAccess |
op_doi |
https://doi.org/10.1016/j.marchem.2021.104005 |
container_title |
Marine Chemistry |
container_volume |
234 |
container_start_page |
104005 |
_version_ |
1790604548250796032 |