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A 1-Ma record of sea surface temperature and extreme cooling events in the North Atlantic: A perspective from the Iberian Margin

2017-09Journal article Restricted
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dc.contributor.authorRodrigues, Teresa
dc.contributor.authorAlonso-Garcia, Montserrat
dc.contributor.authorHodell, D. A.
dc.contributor.authorRufino, MM
dc.contributor.authorNaughton, F.
dc.contributor.authorGrimalt, J. O.
dc.contributor.authorH L Voelker, Antje
dc.contributor.authorAbrantes, Fatima
dc.date.accessioned2019-11-20T15:07:21Z
dc.date.available2019-11-20T15:07:21Z
dc.date.issued2017-09
dc.description.abstractThe Iberian Margin is a sensitive area to track high and low latitude processes, and is a key location to understand major past climatic and oceanographic changes. Here we present new biomarker data from IODP Site U1385 ("Shackleton site") (1017-336 ka) that, when combined with existing data from Cores MD01-2443/4 (last 335 ka), allows us to assess the evolution of sea surface temperature (SST) and meltwater influx over the last 1 Ma at the Iberian Margin. Interglacial periods throughout the last 1 Ma show SST close to 20 degrees C, even during the so-called "luke-warm" interglacials that are marked by relatively low atmospheric CO2 concentrations. During glacial periods, extremely cold stadial events are recognized at the Iberian Margin, and are very likely related to meltwater discharges from the European and British-Irish ice sheets into the NE Atlantic, which were transported southwards by the Portugal Current. We subdivided the record into four intervals on the basis of the timing and the magnitude of these extremely cold stadials: 1) from 1017 to similar to 900 ka, only minor sporadic freshwater input occurred during deglaciations; 2) from 900 to 675 ka extreme cold events occur as terminal stadial events at the beginning of the deglaciations, which results in abrupt deglacial SST shifts; 3) from 675 to 450 ka only a few, very short-lived events are recorded and seldom is there freshwater input at the Iberian Margin; 4) during the last 450 ka the extreme cold events occurred under full glacial conditions, with particularly severe events during MIS 6 and 8. We propose these mid -glacial events are associated with a strong discharges of European ice sheet (EIS). The fact that these extreme cold events do not coincide with deglaciations questions the role of European ice sheet discharges in triggering deglaciations. (C) 2017 Elsevier Ltd. All rights reserved.
dc.description.sponsorshipPortuguese Foundation for Science and Technology [PTDC/AAC-CLI/100157/2008, PIDC/AAG-GLO/3737/2012, PTDC/MAR-PRO/ 3396/2014]
dc.description.sponsorshipFCT [SFRH/BPD/66025/2009, SFRH/BPD/108600/2015]
dc.description.sponsorshipMAG post-doctoral grant [SFRH/BPD/96960/2013]
dc.description.sponsorshipCCMAR [UID/Multi/04326/2013]
dc.description.sponsorshipNatural Environmental Research Council [NE/K005804/1, NE/J017922/1]
dc.description.versioninfo:eu-repo/semantics/publishedVersion
dc.identifier.doi10.1016/j.quascirev.2017.07.004
dc.identifier.issn0277-3791
dc.identifier.urihttp://hdl.handle.net/10400.1/12992
dc.language.isoeng
dc.peerreviewedyes
dc.publisherPergamon-Elsevier Science
dc.rights.urihttp://creativecommons.org/licenses/by/4.0/
dc.subjectMidpleistocene climate transition
dc.subjectMiddle pleistocene transition
dc.subjectOcean circulation
dc.subjectIce-volume
dc.subjectIndex U-37(K')
dc.subjectBrunhes event
dc.subjectSite U1385
dc.subjectTime-scale
dc.subject800-400 Ka
dc.subjectVariability
dc.titleA 1-Ma record of sea surface temperature and extreme cooling events in the North Atlantic: A perspective from the Iberian Margin
dc.typejournal article
dspace.entity.typePublication
oaire.awardURIinfo:eu-repo/grantAgreement/FCT/SFRH/SFRH%2FBPD%2F66025%2F2009/PT
oaire.awardURIinfo:eu-repo/grantAgreement/FCT/5876-PPCDTI/PTDC%2FAAC-CLI%2F100157%2F2008/PT
oaire.awardURIinfo:eu-repo/grantAgreement/FCT/5876/UID%2FMulti%2F04326%2F2013/PT
oaire.citation.endPage130
oaire.citation.startPage118
oaire.citation.titleQuaternary Science Reviews
oaire.citation.volume172
oaire.fundingStreamSFRH
oaire.fundingStream5876-PPCDTI
oaire.fundingStream5876
person.familyNameRodrigues
person.familyNameAlonso-Garcia
person.familyNameRufino
person.familyNameNaughton
person.familyNameVoelker
person.familyNameAbrantes
person.givenNameTeresa
person.givenNameMontserrat
person.givenNameMarta
person.givenNameFilipa
person.givenNameAntje
person.givenNameFatima
person.identifierR-000-JPJ
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person.identifier.orcid0000-0002-3055-9396
person.identifier.orcid0000-0001-6465-6023
person.identifier.orcid0000-0002-9110-0212
person.identifier.ridG-2912-2013
person.identifier.ridE-7659-2013
person.identifier.ridC-5427-2012
person.identifier.ridB-5985-2013
person.identifier.scopus-author-id7004330274
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person.identifier.scopus-author-id6701333407
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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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project.funder.nameFundação para a Ciência e a Tecnologia
rcaap.rightsrestrictedAccess
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