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dc.contributor.authorLittle, SH
dc.contributor.authorArcher, C
dc.contributor.authorMilne, Angela
dc.contributor.authorSchlosser, C
dc.contributor.authorAchterberg, EP
dc.contributor.authorLohan, MC
dc.contributor.authorVance, D
dc.date.accessioned2018-09-10T07:41:06Z
dc.date.issued2018-07-21
dc.identifier.issn0009-2541
dc.identifier.issn1872-6836
dc.identifier.urihttp://hdl.handle.net/10026.1/12255
dc.description.abstract

© 2018 The Authors 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.

dc.format.extent29-43
dc.languageen
dc.language.isoen
dc.publisherElsevier BV
dc.subjectCopper isotopes
dc.subjectGEOTRACES
dc.subjectParticulate
dc.subjectDissolved
dc.subjectSouth Atlantic
dc.titlePaired dissolved and particulate phase Cu isotope distributions in the South Atlantic
dc.typejournal-article
dc.typeJournal Article
plymouth.author-urlhttps://www.webofscience.com/api/gateway?GWVersion=2&SrcApp=PARTNER_APP&SrcAuth=LinksAMR&KeyUT=WOS:000450330000003&DestLinkType=FullRecord&DestApp=ALL_WOS&UsrCustomerID=11bb513d99f797142bcfeffcc58ea008
plymouth.volume502
plymouth.publication-statusPublished
plymouth.journalChemical Geology
dc.identifier.doi10.1016/j.chemgeo.2018.07.022
plymouth.organisational-group/Plymouth
plymouth.organisational-group/Plymouth/Faculty of Science and Engineering
plymouth.organisational-group/Plymouth/Faculty of Science and Engineering/School of Geography, Earth and Environmental Sciences
plymouth.organisational-group/Plymouth/REF 2021 Researchers by UoA
plymouth.organisational-group/Plymouth/REF 2021 Researchers by UoA/UoA07 Earth Systems and Environmental Sciences
plymouth.organisational-group/Plymouth/Research Groups
plymouth.organisational-group/Plymouth/Research Groups/BEACh
plymouth.organisational-group/Plymouth/Users by role
plymouth.organisational-group/Plymouth/Users by role/Academics
dcterms.dateAccepted2018-07-17
dc.rights.embargodate2018-9-12
dc.identifier.eissn1872-6836
dc.rights.embargoperiodNot known
rioxxterms.versionofrecord10.1016/j.chemgeo.2018.07.022
rioxxterms.licenseref.urihttp://www.rioxx.net/licenses/all-rights-reserved
rioxxterms.licenseref.startdate2018-07-21
rioxxterms.typeJournal Article/Review


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