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delta O-18 and Mg/Ca thermometry in planktonic foraminifera: a multiproxy approach toward tracing oastal upwelling dynamics

2020-02Journal article Restricted access
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dc.contributor.authorSalgueiro, Emilia
dc.contributor.authorH L Voelker, Antje
dc.contributor.authorMartin, P. A.
dc.contributor.authorRodrigues, Teresa
dc.contributor.authorZuniga, D.
dc.contributor.authorFrojan, M.
dc.contributor.authorde la Granda, F.
dc.contributor.authorVillacieros-Robineau, N.
dc.contributor.authorAlonso-Perez, F.
dc.contributor.authorAlberto, A.
dc.contributor.authorRebotim, A.
dc.contributor.authorGonzalez-Alvarez, R.
dc.contributor.authorCastro, C. G.
dc.contributor.authorAbrantes, Fatima
dc.date.accessioned2021-06-24T11:35:57Z
dc.date.available2021-06-24T11:35:57Z
dc.date.issued2020-02
dc.description.abstractPlanktonic foraminifera delta O-18 and Mg/Ca ratios are widely considered as a powerful proxy to reconstruct past seawater-column temperature. Due to the complex interpretation of planktonic foraminifera delta O-18 data in regard to past seawater temperatures, temperature determination based on the foraminifera shell Mg/Ca ratio is believed to be more accurate. Scarce Mg/Ca calibration data exists for coastal upwelling regions, resulting in incoherent results of past seawater reconstructions. The current study along the NW Iberia coastal upwelling system intends to define the best Mg/Ca temperature equation for the most representative species of this region (Neogloboquadrina incompta, Globigerina bulloides, and Globorotalia inflata). Seawater temperature from delta O-18 and Mg/Ca of these three planktonic foraminifera species was compared with the surface sediments alkenone derived SST and with the in situ temperatures measured at the depths where these foraminifera species currently live and calcify. The equations that better reflect each species calcification depth were selected as our regional equations for delta O-18 and Mg/Ca temperature reconstructions. The delta O-18-estimated temperatures for surface sediment specimens were comparable with in situ seawater-column temperature measurements, whereas the Mg/Ca derived temperatures seem to underestimate in situ values, in special for G. bulloides from samples affected by stronger coastal upwelling. The G. bulloides delta O-18 and Mg/Ca estimated temperatures from samples located offshore, further from coastal upwelling influence, are comparable to surface sediment alkenone derived temperatures. Our study shows that in upwelling areas, regional calibration of planktonic foraminifera Mg/Ca temperature equations is necessary for reliable interpretations of high-resolution past temperature variability in these important environments.
dc.description.sponsorshipCALIBERIA project [BI/PTDC/MAR/102045/2008/2010-016, PTDC/MAR/102045/2008/BI/2011-002]
dc.description.sponsorshipXunta de Galicia Xunta de GaliciaEuropean Commission [COMPETE/FEDER-FCOMP-01-0124FEDER-010599, 10MDS402013PR]
dc.description.sponsorshipXunta de Galicia (Spain) - RAIA.coXunta de Galicia [SFRH/BPD/108600/2015]
dc.description.sponsorshipIsabel Barreto Program (Xunta de Galicia, Spain) [0520_RAIA]
dc.description.sponsorshipIPMA-2018-05-BTI
dc.description.versioninfo:eu-repo/semantics/publishedVersion
dc.identifier.doi10.1029/2019PA003726
dc.identifier.issn2572-4517
dc.identifier.urihttp://hdl.handle.net/10400.1/16584
dc.language.isoeng
dc.peerreviewedyes
dc.publisherAmerican Geophysical Union
dc.relationMulti-proxy Calibration along the NW Iberian margin: Improving paleoceanographic reconstructions (CALIBERIA)
dc.relationCentre of Marine Sciences
dc.relationCoastal Upwelling's Natural Variability: the last two Climate Extremes (21,000 ± 2,000 Cal-yr BP and 8,000 ± 1,500 Cal-yr BP) - CUPEX.
dc.relationUnderstanding the hydrography and productivity variability during the beginning of Mid-Pleistocene Transition on the SW Portuguese Margin
dc.relationTracking climate dynamics across the Middle Pleistocene Transition, in mid-latitudes and subtropics of the North Atlantic CLIMAx
dc.rights.urihttp://creativecommons.org/licenses/by/4.0/
dc.subject.otherGeology; Oceanography; Paleontology
dc.titledelta O-18 and Mg/Ca thermometry in planktonic foraminifera: a multiproxy approach toward tracing oastal upwelling dynamics
dc.typejournal article
dspace.entity.typePublication
oaire.awardTitleMulti-proxy Calibration along the NW Iberian margin: Improving paleoceanographic reconstructions (CALIBERIA)
oaire.awardTitleCentre of Marine Sciences
oaire.awardTitleCoastal Upwelling's Natural Variability: the last two Climate Extremes (21,000 ± 2,000 Cal-yr BP and 8,000 ± 1,500 Cal-yr BP) - CUPEX.
oaire.awardTitleUnderstanding the hydrography and productivity variability during the beginning of Mid-Pleistocene Transition on the SW Portuguese Margin
oaire.awardTitleTracking climate dynamics across the Middle Pleistocene Transition, in mid-latitudes and subtropics of the North Atlantic CLIMAx
oaire.awardURIinfo:eu-repo/grantAgreement/FCT/5876-PPCDTI/PTDC%2FMAR%2F102045%2F2008/PT
oaire.awardURIinfo:eu-repo/grantAgreement/FCT/6817 - DCRRNI ID/UID%2FMulti%2F04326%2F2019/PT
oaire.awardURIinfo:eu-repo/grantAgreement/FCT/Concurso para Projectos de I&D em todos os Domínios Científicos - 2004/PDCT%2FMAR%2F56963%2F2004/PT
oaire.awardURIinfo:eu-repo/grantAgreement/FCT/OE/SFRH%2FBPD%2F111433%2F2015/PT
oaire.awardURIinfo:eu-repo/grantAgreement/FCT/OE/SFRH%2FBPD%2F108600%2F2015/PT
oaire.citation.issue2
oaire.citation.startPageUNSP e2019PA003726
oaire.citation.titlePaleoceanography and Paleoclimatology
oaire.citation.volume35
oaire.fundingStream5876-PPCDTI
oaire.fundingStream6817 - DCRRNI ID
oaire.fundingStreamConcurso para Projectos de I&D em todos os Domínios Científicos - 2004
oaire.fundingStreamOE
oaire.fundingStreamOE
person.familyNameSalgueiro
person.familyNameVoelker
person.familyNameRodrigues
person.familyNameAbrantes
person.givenNameEmilia
person.givenNameAntje
person.givenNameTeresa
person.givenNameFatima
person.identifier2315310
person.identifier.ciencia-id3B10-07FD-161C
person.identifier.ciencia-idC11E-D8E6-CDFA
person.identifier.ciencia-idEC18-2390-9594
person.identifier.ciencia-id021D-CA76-20D2
person.identifier.orcid0000-0003-1000-2977
person.identifier.orcid0000-0001-6465-6023
person.identifier.orcid0000-0001-7811-7506
person.identifier.orcid0000-0002-9110-0212
person.identifier.ridG-1019-2013
person.identifier.ridC-5427-2012
person.identifier.ridG-2912-2013
person.identifier.ridB-5985-2013
person.identifier.scopus-author-id23486371200
person.identifier.scopus-author-id8784446000
person.identifier.scopus-author-id7004330274
person.identifier.scopus-author-id16030759200
project.funder.identifierhttp://doi.org/10.13039/501100001871
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project.funder.nameFundação para a Ciência e a Tecnologia
project.funder.nameFundação para a Ciência e a Tecnologia
project.funder.nameFundação para a Ciência e a Tecnologia
project.funder.nameFundação para a Ciência e a Tecnologia
project.funder.nameFundação para a Ciência e a Tecnologia
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