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Particle fluxes in the NW Iberian coastal upwelling system: Hydrodynamical and biological control

2016-07Journal article Restricted access
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dc.contributor.authorZuniga, D.
dc.contributor.authorVillacieros-Robineau, N.
dc.contributor.authorSalgueiro, Emilia
dc.contributor.authorAlonso-Perez, F.
dc.contributor.authorRoson, G.
dc.contributor.authorAbrantes, Fatima
dc.contributor.authorCastro, C. G.
dc.date.accessioned2017-04-07T15:56:22Z
dc.date.available2017-04-07T15:56:22Z
dc.date.issued2016-07
dc.description.abstractTo better understand sources and transport of particulate material in the NW Iberian coastal upwelling system, a mooring line dotted with an automated PPS 4/3 sediment trap was deployed off Cape Silleiro at the base of the photic zone. The samples were collected from November 2008 through June 2012 over sampling periods of 4-12 days.Our study represents the first automated sediment trap database for the NW Iberian margin. The magnitude and composition of the settling material showed strong seasonal variability with the highest fluxes during the poleward and winter mixing periods (averages of 12.9 +/- 9.6 g m(-2) d(-1) and 5.6 +/- 5.6 g m(-2) d(-1) respectively), and comparatively lower fluxes (3.6 +/- 4.1 gm(-2) d(-1)) for the upwelling season. Intensive deposition events registered during poleward and winter mixing periods were dominated by the lithogenic fraction (80 +/- 3%). They were associated to high energy wave-driven re suspension processes, due to the occurrence of south-westerly storms, and intense riverine inputs of terrestrial material from Minho and Douro rivers.On the other hand, during the spring- summer upwelling season, the share of biogenic compounds (organic matter, calcium carbonate (CaCO3), biogenic silica (bSiO2)) to downward fluxes was higher, reflecting an increase in pelagic sedimentation due to the seasonal intensification of primary production and negligible river inputs and wave-driven resuspended material. Otherwise, the large variations of biogenic settling particles were mainly modulated by upwelling intensity, which by means of upwelling filaments ultimately controlled the offshore transport of the organic carbon fixed by primary producers towards the adjacent ocean. Based on the average downward flux of organic carbon (212 mg C m(-2) d(-1)) and considering an average primary production of 1013 mg C m(-2) d(-1) from literature, we estimated that about 21% of the fixed carbon is vertically exported during the upwelling season. (C) 2016 Elsevier Ltd. All rights reserved.
dc.description.sponsorshipCAIBEX (CTM2007–66408-C02–01/MAR); REIMAGE (CTM2011–30155–C03–03); EXCAPA project (10MDS402013PR); Projects RAIA (INTERREG 2009/2011; 0313/RAIA/E)
dc.identifier.doi10.1016/j.csr.2016.04.008
dc.identifier.issn0278-4343
dc.identifier.urihttp://hdl.handle.net/10400.1/9394
dc.language.isoeng
dc.peerreviewedyes
dc.publisherElsevier
dc.relationMulti-proxy Calibration along the NW Iberian margin: Improving paleoceanographic reconstructions (CALIBERIA)
dc.relationUnderstanding the hydrography and productivity variability during the beginning of Mid-Pleistocene Transition on the SW Portuguese Margin
dc.relation.isbasedonWOS:000378960500008
dc.titleParticle fluxes in the NW Iberian coastal upwelling system: Hydrodynamical and biological control
dc.typejournal article
dspace.entity.typePublication
oaire.awardTitleMulti-proxy Calibration along the NW Iberian margin: Improving paleoceanographic reconstructions (CALIBERIA)
oaire.awardTitleUnderstanding the hydrography and productivity variability during the beginning of Mid-Pleistocene Transition on the SW Portuguese Margin
oaire.awardURIinfo:eu-repo/grantAgreement/FCT/5876-PPCDTI/PTDC%2FMAR%2F102045%2F2008/PT
oaire.awardURIinfo:eu-repo/grantAgreement/FCT/OE/SFRH%2FBPD%2F111433%2F2015/PT
oaire.citation.endPage98
oaire.citation.startPage89
oaire.citation.titleContinental Shelf Research
oaire.citation.volume123
oaire.fundingStream5876-PPCDTI
oaire.fundingStreamOE
person.familyNameSalgueiro
person.familyNameAbrantes
person.givenNameEmilia
person.givenNameFatima
person.identifier.ciencia-id3B10-07FD-161C
person.identifier.ciencia-id021D-CA76-20D2
person.identifier.orcid0000-0003-1000-2977
person.identifier.orcid0000-0002-9110-0212
person.identifier.ridG-1019-2013
person.identifier.ridB-5985-2013
person.identifier.scopus-author-id23486371200
person.identifier.scopus-author-id16030759200
project.funder.identifierhttp://doi.org/10.13039/501100001871
project.funder.identifierhttp://doi.org/10.13039/501100001871
project.funder.nameFundação para a Ciência e a Tecnologia
project.funder.nameFundação para a Ciência e a Tecnologia
rcaap.rightsrestrictedAccess
rcaap.typearticle
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relation.isAuthorOfPublication45b2d36a-1a11-4b6c-81b3-47f657904207
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