Paired dissolved and particulate phase Cu isotope distributions in the South Atlantic
Copper (Cu) is both an essential micronutrient and toxic to photosynthesizing microorganisms at low concentrations. Its dissolved vertical distribution in the oceans is unusual, being neither a nutrient-type nor scavenged-type element. This distribution is attributed to biological uptake in the surf...
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Online Access: | http://hdl.handle.net/10044/1/62832 https://doi.org/10.1016/j.chemgeo.2018.07.022 |
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ftimperialcol:oai:spiral.imperial.ac.uk:10044/1/62832 2023-05-15T15:13:44+02:00 Paired dissolved and particulate phase Cu isotope distributions in the South Atlantic Little, SH Archer, C Milne, A Schlosser, C Achterberg, E Lohan, M Vance, D Leverhulme Trust Natural Environment Research Council (NERC) 2018-07-17 http://hdl.handle.net/10044/1/62832 https://doi.org/10.1016/j.chemgeo.2018.07.022 unknown Elsevier Chemical Geology © 2018 The Authors. Published by Elsevier B.V. This is an open access article under the CC BY license (http://creativecommons.org/licenses/BY/4.0/). CC-BY 43 29 Science & Technology Physical Sciences Geochemistry & Geophysics Copper isotopes GEOTRACES Particulate Dissolved South Atlantic PLASMA-MASS SPECTROMETRY ARCTIC PACIFIC-OCEAN ACID CHELATING RESIN MARINE-SEDIMENTS NORTH-ATLANTIC TRACE-ELEMENTS ORGANIC-LIGANDS ZINC ISOTOPES TASMAN SEA DEEP-OCEAN 0402 Geochemistry 0403 Geology 0406 Physical Geography And Environmental Geoscience Journal Article 2018 ftimperialcol https://doi.org/10.1016/j.chemgeo.2018.07.022 2018-12-20T23:39:40Z Copper (Cu) is both an essential micronutrient and toxic to photosynthesizing microorganisms at low concentrations. Its dissolved vertical distribution in the oceans is unusual, being neither a nutrient-type nor scavenged-type element. This distribution is attributed to biological uptake in the surface ocean with remineralisation at depth, combined with strong organic complexation by dissolved ligands, scavenging onto particles, and benthic sedimentary input. We present coupled dissolved and particulate phase Cu isotope data along the UK-GEOTRACES South Atlantic section, alongside higher resolution dissolved and particulate phase Cu concentration measurements. Our dissolved phase isotope data contribute to an emerging picture of homogeneous deep ocean δ65Cu, at about +0.65‰ (relative to NIST SRM 976). We identify two pools of Cu in the particulate phase: a refractory, lithogenic pool, at about 0‰, and a labile pool accessed via a weak acidic leach, at about +0.4‰. These two pools are comparable to those previously observed in sediments. We observe deviations towards lighter δ65Cu values in the dissolved phase associated with local enrichments in particulate Cu concentrations along the continental slopes, and in the surface ocean. Copper isotopes are thus a sensitive indicator of localised particle-associated benthic or estuarine Cu inputs. The measurement of Cu isotopes in seawater is analytically challenging, and we call for an intercalibration exercise to better evaluate the potential impacts of UV-irradiation, storage time, and different analytical procedures. Article in Journal/Newspaper Arctic North Atlantic Imperial College London: Spiral Arctic Pacific Chemical Geology 502 29 43 |
institution |
Open Polar |
collection |
Imperial College London: Spiral |
op_collection_id |
ftimperialcol |
language |
unknown |
topic |
Science & Technology Physical Sciences Geochemistry & Geophysics Copper isotopes GEOTRACES Particulate Dissolved South Atlantic PLASMA-MASS SPECTROMETRY ARCTIC PACIFIC-OCEAN ACID CHELATING RESIN MARINE-SEDIMENTS NORTH-ATLANTIC TRACE-ELEMENTS ORGANIC-LIGANDS ZINC ISOTOPES TASMAN SEA DEEP-OCEAN 0402 Geochemistry 0403 Geology 0406 Physical Geography And Environmental Geoscience |
spellingShingle |
Science & Technology Physical Sciences Geochemistry & Geophysics Copper isotopes GEOTRACES Particulate Dissolved South Atlantic PLASMA-MASS SPECTROMETRY ARCTIC PACIFIC-OCEAN ACID CHELATING RESIN MARINE-SEDIMENTS NORTH-ATLANTIC TRACE-ELEMENTS ORGANIC-LIGANDS ZINC ISOTOPES TASMAN SEA DEEP-OCEAN 0402 Geochemistry 0403 Geology 0406 Physical Geography And Environmental Geoscience Little, SH Archer, C Milne, A Schlosser, C Achterberg, E Lohan, M Vance, D Paired dissolved and particulate phase Cu isotope distributions in the South Atlantic |
topic_facet |
Science & Technology Physical Sciences Geochemistry & Geophysics Copper isotopes GEOTRACES Particulate Dissolved South Atlantic PLASMA-MASS SPECTROMETRY ARCTIC PACIFIC-OCEAN ACID CHELATING RESIN MARINE-SEDIMENTS NORTH-ATLANTIC TRACE-ELEMENTS ORGANIC-LIGANDS ZINC ISOTOPES TASMAN SEA DEEP-OCEAN 0402 Geochemistry 0403 Geology 0406 Physical Geography And Environmental Geoscience |
description |
Copper (Cu) is both an essential micronutrient and toxic to photosynthesizing microorganisms at low concentrations. Its dissolved vertical distribution in the oceans is unusual, being neither a nutrient-type nor scavenged-type element. This distribution is attributed to biological uptake in the surface ocean with remineralisation at depth, combined with strong organic complexation by dissolved ligands, scavenging onto particles, and benthic sedimentary input. We present coupled dissolved and particulate phase Cu isotope data along the UK-GEOTRACES South Atlantic section, alongside higher resolution dissolved and particulate phase Cu concentration measurements. Our dissolved phase isotope data contribute to an emerging picture of homogeneous deep ocean δ65Cu, at about +0.65‰ (relative to NIST SRM 976). We identify two pools of Cu in the particulate phase: a refractory, lithogenic pool, at about 0‰, and a labile pool accessed via a weak acidic leach, at about +0.4‰. These two pools are comparable to those previously observed in sediments. We observe deviations towards lighter δ65Cu values in the dissolved phase associated with local enrichments in particulate Cu concentrations along the continental slopes, and in the surface ocean. Copper isotopes are thus a sensitive indicator of localised particle-associated benthic or estuarine Cu inputs. The measurement of Cu isotopes in seawater is analytically challenging, and we call for an intercalibration exercise to better evaluate the potential impacts of UV-irradiation, storage time, and different analytical procedures. |
author2 |
Leverhulme Trust Natural Environment Research Council (NERC) |
format |
Article in Journal/Newspaper |
author |
Little, SH Archer, C Milne, A Schlosser, C Achterberg, E Lohan, M Vance, D |
author_facet |
Little, SH Archer, C Milne, A Schlosser, C Achterberg, E Lohan, M Vance, D |
author_sort |
Little, SH |
title |
Paired dissolved and particulate phase Cu isotope distributions in the South Atlantic |
title_short |
Paired dissolved and particulate phase Cu isotope distributions in the South Atlantic |
title_full |
Paired dissolved and particulate phase Cu isotope distributions in the South Atlantic |
title_fullStr |
Paired dissolved and particulate phase Cu isotope distributions in the South Atlantic |
title_full_unstemmed |
Paired dissolved and particulate phase Cu isotope distributions in the South Atlantic |
title_sort |
paired dissolved and particulate phase cu isotope distributions in the south atlantic |
publisher |
Elsevier |
publishDate |
2018 |
url |
http://hdl.handle.net/10044/1/62832 https://doi.org/10.1016/j.chemgeo.2018.07.022 |
geographic |
Arctic Pacific |
geographic_facet |
Arctic Pacific |
genre |
Arctic North Atlantic |
genre_facet |
Arctic North Atlantic |
op_source |
43 29 |
op_relation |
Chemical Geology |
op_rights |
© 2018 The Authors. Published by Elsevier B.V. This is an open access article under the CC BY license (http://creativecommons.org/licenses/BY/4.0/). |
op_rightsnorm |
CC-BY |
op_doi |
https://doi.org/10.1016/j.chemgeo.2018.07.022 |
container_title |
Chemical Geology |
container_volume |
502 |
container_start_page |
29 |
op_container_end_page |
43 |
_version_ |
1766344262371246080 |