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The Nature of Opal Burial in the Equatorial Atlantic During the Deglaciation

2023Journal article Open access
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dc.contributor.authorGil, I. M.
dc.contributor.authorMcmanus, J. F.
dc.contributor.authorRebotim, A.
dc.contributor.authorNarciso, A.
dc.contributor.authorSalgueiro, E.
dc.contributor.authorAbrantes, F.
dc.date.accessioned2024-04-29T10:42:29Z
dc.date.available2024-04-29T10:42:29Z
dc.date.issued2023
dc.description.abstractRelatively high opal concentrations are measured in equatorial Atlantic sediments from the most recent deglaciation. To shed light on their causes, seven cores were analyzed for their content of siliceous (diatom, silicoflagellates, radiolarians, phytoliths, and sponge spicules) and calcareous (coccolithophores) microfossils. An early deglacial signal is detected at the time of rising boreal summer insolation ca. 18 ka by the coccolithophores. The surface freshening is likely due to the rain belt associated with the intertropical convergence zone (ITCZ), implying its southward shift relatively to its present-day average positioning. The diatom assemblages corresponding to the following increase in diatom abundances ca. 15.5 ka suggest the formation of a cold tongue of upwelled water associated with tropical instability waves propagating westward. Such conditions occur at present during boreal summer, when southerly trade winds are intensified, and the ITCZ shifts northward. The presence of the diatom Ethmodiscus rex (Wallich) Hendey and the coccolithophore Florisphera profunda indicates a deep thermocline and nutrient enrichment of the lower photic zone, revealing that Si-rich southern sourced water (SSW) likely contributed to enhanced primary productivity during this time interval. The discrepancies between the maximum opal concentrations and siliceous marine microfossils records evidence the contribution of freshwater diatoms and phytoliths, indicative of other processes. The definition of the nature of the opal record suggests successive productivity conditions associated with specific atmospheric settings determining the latitudinal ITCZ positioning and the development of oceanic processes; and major oceanic circulation changes permitting the contribution of SSW to marine productivity at this latitude.pt_PT
dc.description.versioninfo:eu-repo/semantics/publishedVersionpt_PT
dc.identifier.citationGil, I. M., McManus, J. F., Rebotim, A., Narciso, A., Salgueiro, E., & Abrantes, F. (2023). The nature of opal burial in the equatorial Atlantic during the deglaciation. Paleoceanography and Paleoclimatology, 38, e2022PA004582. https://doi.org/10.1029/2022PA004582pt_PT
dc.identifier.doi10.1029/2022PA004582pt_PT
dc.identifier.urihttp://hdl.handle.net/10400.13/5655
dc.language.isoengpt_PT
dc.publisherAmerican Geophysical Unionpt_PT
dc.relationStrategic Project - LA 15 - 2011-2012
dc.relationAlgarve Centre for Marine Sciences
dc.relationAlgarve Centre for Marine Sciences
dc.rights.urihttp://creativecommons.org/licenses/by/4.0/pt_PT
dc.subjectOpal burialpt_PT
dc.subjectEquatorial Atlanticpt_PT
dc.subjectDeglaciationpt_PT
dc.subject.pt_PT
dc.subjectFaculdade de Ciências da Vidapt_PT
dc.titleThe Nature of Opal Burial in the Equatorial Atlantic During the Deglaciationpt_PT
dc.typejournal article
dspace.entity.typePublication
oaire.awardTitleStrategic Project - LA 15 - 2011-2012
oaire.awardTitleAlgarve Centre for Marine Sciences
oaire.awardTitleAlgarve Centre for Marine Sciences
oaire.awardURIinfo:eu-repo/grantAgreement/FCT/5876-PPCDTI/PTDC%2FAAC-AMB%2F108449%2F2008/PT
oaire.awardURIinfo:eu-repo/grantAgreement/FCT/6820 - DCRRNI ID/PEst-C%2FMAR%2FLA0015%2F2011/PT
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oaire.awardURIinfo:eu-repo/grantAgreement/FCT/6817 - DCRRNI ID/UIDP%2F04326%2F2020/PT
oaire.awardURIinfo:eu-repo/grantAgreement/FCT/FARH/SFRH%2FBPD%2F87718%2F2012/PT
oaire.citation.endPage15pt_PT
oaire.citation.issue8pt_PT
oaire.citation.startPage1pt_PT
oaire.citation.titlePaleoceanography and Paleoclimatologypt_PT
oaire.citation.volume38pt_PT
oaire.fundingStream5876-PPCDTI
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oaire.fundingStream6817 - DCRRNI ID
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oaire.fundingStreamFARH
person.familyNameGil
person.familyNamemcmanus
person.familyNameMartins Narciso
person.familyNameSalgueiro
person.familyNameAbrantes
person.givenNameIsabelle
person.givenNamejerry
person.givenNameÁurea
person.givenNameEmilia
person.givenNameFatima
person.identifierAAU-8890-2021
person.identifier.ciencia-idD815-9890-8017
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person.identifier.ciencia-id3B10-07FD-161C
person.identifier.ciencia-id021D-CA76-20D2
person.identifier.orcid0000-0001-5151-2258
person.identifier.orcid0000-0002-7365-1600
person.identifier.orcid0000-0002-4319-0241
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-id15727594300
person.identifier.scopus-author-id52564241900
person.identifier.scopus-author-id23486371200
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
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rcaap.rightsopenAccesspt_PT
rcaap.typearticlept_PT
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