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Influence of an upwelling filament on the distribution of labile fraction of dissolved Zn, Cd and Pb off Cape Sao Vicente, SW Iberia

2015-02Journal article Open access
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dc.contributor.authorMonteiro, Carlos Eduardo
dc.contributor.authorCardeira, Sara
dc.contributor.authorCravo, Alexandra
dc.contributor.authorBebianno, Maria João
dc.contributor.authorSanchez, Ricardo F.
dc.contributor.authorRelvas, Paulo
dc.date.accessioned2018-12-07T14:53:01Z
dc.date.available2018-12-07T14:53:01Z
dc.date.issued2015-02
dc.description.abstractUnder northerly winds upwelling is recurrent at the Cape Sao Vicente, SW Iberia, and plays a major role on the distribution of dissolved nutrients and metals. The aim of this work was to characterize the dissolved metals distribution of zinc (Zn), cadmium (Cd) and lead (Pb), associated with a filament of upwelled water that stretches seaward from the Cape. Additionally, the relationships between labile metals and other oceanographic parameters, such as current velocity and wind field patterns, temperature and salinity, nutrients, chlorophyll a and suspended solids were evaluated. The mass transport of the dissolved metals exported offshore was estimated, after a period of relatively strong and persistent upwelling. At the end of October 2004 a total of 42 CID Rosette casts up to 400 dbar were sampled, distributed on an almost regular grid, together with along-track Acoustic Doppler Current Profile (ADCP) velocities. Seawater samples from two transects across the filament were analysed: one closest to the shore, where upwelling was intense and phytoplankton noticeably grew; and another further offshore where the filament was still well defined, but narrower and less marked despite with the maximum velocity currents. Labile dissolved metals were determined using anodic stripping voltammetry (ASV). The range of the metals recorded at the transect closest to the coast recorded was 0.26-3.8 nM (mean: 0.8 nM) for Zn, 2-11 pM (mean: 3 pM) for Cd and 8-60 pM (mean: 13 pM) while for the offshore transect was: 0.26-5.1 nM (mean: 1.2 nM) for Zn, 2-26 pM (mean 4 pM) for Cd and 8-74 pM (mean: 15 pM). Zinc recorded the highest concentrations, similar at both transects, and like Cd the lowest concentrations were found at near-surface depths. In opposition, the highest Pb concentrations were found at the near-surface depths at the northern stations in both transects. The filament exported more material in the offshore transect than in the transect closest to the coast, corresponding to a maximum export of 135 kmol d(-1) of Zn, 276 mol d(-1) of Cd and 1365 mol d(-1) of Pb. The quantification of the cross-shelf fluxes imposed by the filament did show that metals fluxes are strong enough to play a key role in the oceanographic behaviour of the transition zone between the coastal and offshore waters in the region. Considering the periods of strong upwelling events and the extent of their duration along the year, the amounts of exported water mass which include nutrients, metals and particles must be hugely increased and responsible for the high productivity of the waters. (C) 2015 Elsevier Ltd. All rights reserved.
dc.description.sponsorshipFCT - Portugal [PDCTM/P/Mar/15296/99]
dc.description.versioninfo:eu-repo/semantics/publishedVersion
dc.identifier.doi10.1016/j.csr.2014.12.004
dc.identifier.issn0278-4343
dc.identifier.issn1873-6955
dc.identifier.urihttp://hdl.handle.net/10400.1/11315
dc.language.isoeng
dc.peerreviewedyes
dc.publisherPergamon-Elsevier Science Ltd
dc.rights.urihttp://creativecommons.org/licenses/by/4.0/
dc.subjectWestern Mediterranean Sea
dc.subjectCoastal transition zone
dc.subjectTrace-metal enrichments
dc.subjectCentral North Pacific
dc.subjectSurface waters
dc.subjectAtlantic-Ocean
dc.subjectSouthern-Ocean
dc.subjectAtmospheric inputs
dc.subjectPortuguese coast
dc.subjectOrganic-ligands
dc.titleInfluence of an upwelling filament on the distribution of labile fraction of dissolved Zn, Cd and Pb off Cape Sao Vicente, SW Iberia
dc.typejournal article
dspace.entity.typePublication
oaire.citation.endPage41
oaire.citation.startPage28
oaire.citation.titleContinental Shelf Research
oaire.citation.volume94
person.familyNameMonteiro
person.familyNameCravo
person.familyNameBebianno
person.familyNameSánchez leal
person.familyNameRelvas
person.givenNameCarlos Eduardo
person.givenNameAlexandra
person.givenNameMaria
person.givenNameRicardo Félix
person.givenNamePaulo
person.identifier.ciencia-idBD19-F2D2-448A
person.identifier.ciencia-id7419-EE20-8039
person.identifier.ciencia-id2B11-46AC-B94B
person.identifier.ciencia-id2412-1F65-A044
person.identifier.orcid0000-0001-5061-2257
person.identifier.orcid0000-0002-2569-3929
person.identifier.orcid0000-0003-1492-8566
person.identifier.orcid0000-0003-0492-9186
person.identifier.orcid0000-0002-6404-5895
person.identifier.ridD-8221-2015
person.identifier.ridE-1347-2012
person.identifier.ridB-1257-2008
person.identifier.scopus-author-id56448166600
person.identifier.scopus-author-id7004152715
person.identifier.scopus-author-id56449413900
person.identifier.scopus-author-id6505976206
rcaap.rightsopenAccess
rcaap.typearticle
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