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Variations in mid-latitude North Atlantic surface water properties during the mid-Brunhes (MIS 9-14) and their implications for the thermohaline circulation

2010Journal article Open access
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dc.contributor.authorVoelker, Antje
dc.contributor.authorRodrigues, T.
dc.contributor.authorBillups, K.
dc.contributor.authorOppo, D.
dc.contributor.authorMcManus, J.
dc.contributor.authorStein, R.
dc.contributor.authorHefter, J.
dc.contributor.authorGrimalt, J.O.
dc.date.accessioned2020-07-24T13:09:52Z
dc.date.available2020-07-24T13:09:52Z
dc.date.issued2010
dc.date.updated2020-07-23T15:28:30Z
dc.description.abstractStable isotope and ice-rafted debris records from three core sites in the mid-latitude North Atlantic (IODP Site U1313, MD01-2446, MD03-2699) are combined with records of ODP Sites 1056/1058 and 980 to reconstruct hydrographic conditions during the middle Pleistocene spanning Marine Isotope Stages (MIS) 9-14 (300-540 ka). Core MD03-2699 is the first high-resolution mid-Brunhes record from the North Atlantic's eastern boundary upwelling system covering the complete MIS 11c interval and MIS 13. The array of sites reflect western and eastern basin boundary current as well as north to south transect sampling of subpolar and transitional water masses and allow the reconstruction of transport pathways in the upper limb of the North Atlantic's circulation. Hydrographic conditions in the surface and deep ocean during peak interglacial MIS 9 and 11 were similar among all the sites with relative stable conditions and confirm prolonged warmth during MIS 11c also for the mid-latitudes. Sea surface temperature (SST) reconstructions further reveal that in the mid-latitude North Atlantic MIS 11c is associated with two plateaus, the younger one of which is slightly warmer. Enhanced subsurface northward heat transport in the eastern boundary current system, especially during early MIS 11c, is denoted by the presence of tropical planktic foraminifer species and raises the question how strongly it impacted the Portuguese upwelling system. Deep water ventilation at the onset of MIS 11c significantly preceded surface water ventilation. Although MIS 13 was generally colder and more variable than the younger interglacials the surface water circulation scheme was the same. The greatest differences between the sites existed during the glacial inceptions and glacials. Then a north - south trending hydrographic front separated the nearshore and offshore waters off Portugal. While offshore waters originated from the North Atlantic Current as indicated by the similarities between the records of IODP Site U1313, ODP Site 980 and MD01-2446, nearshore waters as recorded in core MD03-2699 derived from the Azores Current and thus the subtropical gyre. Except for MIS 12, Azores Current influence seems to be related to eastern boundary system dynamics and not to changes in the Atlantic overturning circulation.pt_PT
dc.description.versioninfo:eu-repo/semantics/publishedVersionpt_PT
dc.identifier.doi10.5194/cp-6-531-2010pt_PT
dc.identifier.slugcv-prod-423514
dc.identifier.urihttp://hdl.handle.net/10400.1/14518
dc.language.isoengpt_PT
dc.peerreviewedyespt_PT
dc.relationRECONSTRUÇÃO DAS CONDIÇÕES CLIMÁTICAS NA MARGEM PORTUGUESA DURANTE O HOLOCÉNICO - ANALOGIAS COM O ESTÁDIO 11
dc.relationPast Ocean Circulation and Productivity Changes on the Portuguese Margin and in the Open North Atlantic: Northern Hemisphere - Antarctica Linkages 380,000 to 800,000 years ago (PORTO)
dc.relationEUROMARGINS: SEDPORT ‘Sedimentation processes on the Portuguese margin: the role of continental climate, ocean circulation, sea level and neotectonics'
dc.subjectAtlântico Nortept_PT
dc.subjectPlistocénico médiopt_PT
dc.subjectIODPpt_PT
dc.subjectStable isotopespt_PT
dc.titleVariations in mid-latitude North Atlantic surface water properties during the mid-Brunhes (MIS 9-14) and their implications for the thermohaline circulationpt_PT
dc.typejournal article
dspace.entity.typePublication
oaire.awardTitleRECONSTRUÇÃO DAS CONDIÇÕES CLIMÁTICAS NA MARGEM PORTUGUESA DURANTE O HOLOCÉNICO - ANALOGIAS COM O ESTÁDIO 11
oaire.awardTitlePast Ocean Circulation and Productivity Changes on the Portuguese Margin and in the Open North Atlantic: Northern Hemisphere - Antarctica Linkages 380,000 to 800,000 years ago (PORTO)
oaire.awardTitleEUROMARGINS: SEDPORT ‘Sedimentation processes on the Portuguese margin: the role of continental climate, ocean circulation, sea level and neotectonics'
oaire.awardURIinfo:eu-repo/grantAgreement/FCT//SFRH%2FBD%2F13749%2F2003/PT
oaire.awardURIinfo:eu-repo/grantAgreement/FCT/PDCT/PDCT%2FMAR%2F58282%2F2004/PT
oaire.awardURIinfo:eu-repo/grantAgreement/FCT/3599-PPCDT/PDCTM%2FDIV%2F40017%2F2003/PT
oaire.awardURIinfo:eu-repo/grantAgreement/FCT/SFRH/SFRH%2FBPD%2F21691%2F2005/PT
oaire.citation.endPage552pt_PT
oaire.citation.issue6pt_PT
oaire.citation.startPage531pt_PT
oaire.citation.titleClimate of the Pastpt_PT
oaire.citation.volume6pt_PT
oaire.fundingStreamPDCT
oaire.fundingStream3599-PPCDT
oaire.fundingStreamSFRH
person.familyNameVoelker
person.givenNameAntje
person.identifier2315310
person.identifier.ciencia-idC11E-D8E6-CDFA
person.identifier.orcid0000-0001-6465-6023
person.identifier.ridC-5427-2012
person.identifier.scopus-author-id8784446000
project.funder.identifierhttp://doi.org/10.13039/501100001871
project.funder.identifierhttp://doi.org/10.13039/501100001871
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
project.funder.nameFundação para a Ciência e a Tecnologia
project.funder.nameFundação para a Ciência e a Tecnologia
rcaap.cv.cienciaidC11E-D8E6-CDFA | Antje Helga Luise Voelker
rcaap.rightsopenAccesspt_PT
rcaap.typearticlept_PT
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