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Mediterranean Outflow and surface water variability off southern Portugal during the early Pleistocene: A snapshot at Marine Isotope Stages 29 to 34 (1020-1135 ka)

2015-10Journal article Open Access
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dc.contributor.authorVoelker, Antje H. L.
dc.contributor.authorSalgueiro, Emilia
dc.contributor.authorRodrigues, Teresa
dc.contributor.authorJiménez-Espejo, Francisco J.
dc.contributor.authorBahr, Andre
dc.contributor.authorAlberto, Ana
dc.contributor.authorLoureiro, Isabel
dc.contributor.authorPadilha, Maria
dc.contributor.authorRebotim, Andreia
dc.contributor.authorRoehl, Ursula
dc.date.accessioned2018-12-07T14:58:03Z
dc.date.available2018-12-07T14:58:03Z
dc.date.issued2015-10
dc.description.abstractCentennial-to-millennial scale records from IODP Site U1387, drilled during IODP Expedition 339 into the Faro Drift at 558 m water depth, now allow evaluating the climatic history of the upper core of the Mediterranean Outflow (MOW) and of the surface waters in the northern Gulf of Cadiz during the early Pleistocene. This study focuses on the period from Marine Isotope Stages (MIS) 29 to 34, i.e. the interval surrounding extreme interglacial MIS 31. Conditions in the upper MOW reflect obliquity, precession and millennial-scale variations. The benthic delta O-18 signal follows obliquity with the exception of an additional, smaller delta O-18 peak that marks the MIS 32/31 transition. Insolation maxima (precession minima) led to poor ventilation and a sluggish upper MOW core, whereas insolation minima were associated with enhanced ventilation and often also increased bottom current velocity. Millennial-scale periods of colder sea-surface temperatures (SST) were associated with short-term maxima in flow velocity and better ventilation, reminiscent of conditions known from MIS 3.A prominent contourite layer, coinciding with insolation cycle 100, was formed during MIS 31 and represents one of the few contourites developing within an interglacial period. MIS 31 surface water conditions were characterized by an extended period (1065-1091 ka) of warm SST, but SST were not much warmer than during MIS 33. Interglacial to glacial transitions experienced 2 to 3 stadial/interstadial cycles, just like their mid-to-late Pleistocene counterparts. Glacial MIS 30 and 32 recorded periods of extremely cold (<12 degrees C) SST that in their climatic impact were comparable with the Heinrich events of the mid and late Pleistocene. Glacial MIS 34, on the other hand, was a relative warm glacial period off southern Portugal. Overall, surface water and MOW conditions at Site U1387 show a strong congruence with Mediterranean climate, whereas millennial-scale variations are closely linked to North Atlantic circulation changes. (C) 2015 Elsevier B.V. All rights reserved.
dc.description.sponsorshipFundação para a Ciência e a Tecnologia (FCT; Portugal) through MOWCADYN project [PTDC/MAR-PRO/3761/2012]; FCT [SFRH/BPD/66025/2009]; Deutsche Forschungsgemeinschaft (DFG) [BA 3809/4, RO 1113/6]; MARUM Research Center; Spanish Ministry of Science and Innovation [CTM 2011-24079]; European Union [228344-EUROFLEETS]
dc.description.versioninfo:eu-repo/semantics/publishedVersion
dc.identifier.doi10.1016/j.gloplacha.2015.08.015
dc.identifier.issn0921-8181
dc.identifier.issn1872-6364
dc.identifier.urihttp://hdl.handle.net/10400.1/11835
dc.language.isoeng
dc.peerreviewedyes
dc.publisherElsevier
dc.relationTOWARDS AN ALLIANCE OF EUROPEAN RESEARCH FLEETS
dc.rights.urihttp://creativecommons.org/licenses/by/4.0/
dc.subjectBenthic foraminiferal assemblages
dc.subjectMidpleistocene climate transition
dc.subjectAfrican summer monsoon
dc.subjectWestern iberian margin
dc.subjectNorth-atlantic
dc.subjectContourite system
dc.subjectLate quaternary
dc.subjectGulf
dc.subjectCadiz
dc.subjectCirculation
dc.titleMediterranean Outflow and surface water variability off southern Portugal during the early Pleistocene: A snapshot at Marine Isotope Stages 29 to 34 (1020-1135 ka)
dc.typejournal article
dspace.entity.typePublication
oaire.awardTitleTOWARDS AN ALLIANCE OF EUROPEAN RESEARCH FLEETS
oaire.awardURIinfo:eu-repo/grantAgreement/FCT/SFRH/SFRH%2FBPD%2F66025%2F2009/PT
oaire.awardURIinfo:eu-repo/grantAgreement/EC/FP7/228344/EU
oaire.citation.endPage237
oaire.citation.startPage223
oaire.citation.titleGlobal and Planetary Change
oaire.citation.volume133
oaire.fundingStreamSFRH
oaire.fundingStreamFP7
person.familyNameSalgueiro
person.familyNameRodrigues
person.familyNameRebotim
person.givenNameEmilia
person.givenNameTeresa
person.givenNameAndreia
person.identifier.ciencia-id3B10-07FD-161C
person.identifier.ciencia-idEC18-2390-9594
person.identifier.ciencia-id7511-A470-FA40
person.identifier.orcid0000-0003-1000-2977
person.identifier.orcid0000-0001-7811-7506
person.identifier.orcid0000-0001-6950-6331
person.identifier.ridG-1019-2013
person.identifier.ridG-2912-2013
person.identifier.scopus-author-id23486371200
person.identifier.scopus-author-id7004330274
person.identifier.scopus-author-id56829454800
project.funder.identifierhttp://doi.org/10.13039/501100001871
project.funder.identifierhttp://doi.org/10.13039/501100008530
project.funder.nameFundação para a Ciência e a Tecnologia
project.funder.nameEuropean Commission
rcaap.rightsopenAccess
rcaap.typearticle
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