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Surface-ocean dynamics during eccentricity minima: a comparison between interglacial Marine Isotope Stage (MIS) 1 and MIS 11 on the Iberian Margin

2019-01Journal article Restricted access
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dc.contributor.authorPalumbo, Eliana
dc.contributor.authorVoelker, Antje
dc.contributor.authorFlores, Jose Abel
dc.contributor.authorAmore, Ornella F.
dc.date.accessioned2020-07-24T10:53:24Z
dc.date.available2020-07-24T10:53:24Z
dc.date.issued2019-01
dc.description.abstractUnderstanding interglacial climate variability is a key issue in the scientific community. Here we compared records from Marine Isotope Stage (MIS) 11 to those from MIS 1 (Holocene) as they are perceived to be possible analogs. Our study on the Iberian Margin, a key area to investigate surface dynamics in the Atlantic Ocean, incorporates coccolithophore assemblage and alkenone data of core MD03-2699 and their statistical analyses. Evaluating similarities between MIS 11 and MIS 1 depends on the way the two MIS are being aligned, i.e. at the deglaciation or based on the precession signal. During the deglaciation of either MIS 12 or MIS 2, the Iberian Margin was affected by abrupt decreases in SST and in coccolithophores' paleoproductivity caused by the arrival of subpolar surface waters. Just prior to the decline, in both the intervals, the Portugal Current affected the studied site, although a possible difference in upwelling strength is here suggested and related to more intense westerlies during the last glacial than the late MIS 12. Similar surface-ocean dynamics occurred at the onset of both MIS 11 and MIS 1 as indicated by the prevalence of the Iberian Poleward Current and sometimes the Azores Current, although the subtropical waters were more oligotrophic during the MIS 2 deglaciation than the MIS 12 one. Synchronizing our records according to the precession cycles aligns the early-to-mid Holocene with the second, warmer phase of MIS 11c. During both these intervals, the western Iberian Margin was mainly affected by the Iberian Poleward Current that transported more temperate-warm, mesotrophic surface waters during MIS 11c than during the early-to-mid Holocene. During the early to mid-Holocene the Iberian Margin endured incursions of colder surface waters that did not occur during MIS 11c allowing us to hypothesize that the studied site experienced, from a paleoceanographic point of view, a more stable period during MIS 11c than the early Holocene. Finally, spectral analysis suggests the role of full, half and fourth precession components in driving surface-ocean variability during MIS 11 and during the last 24 kyr BP.
dc.description.sponsorshipMIUR (Ministero dell'Istruzione, dell'Universita e della Ricerca)Ministry of Education, Universities and Research (MIUR)
dc.description.sponsorshipFondi di Ricerca di Ateneo (FRA)
dc.description.sponsorshipItaly
dc.description.sponsorshipFCT (Portugal)Portuguese Foundation for Science and Technology [PDCT/MAR/58282/2004]
dc.description.sponsorshipFCTPortuguese Foundation for Science and Technology [IF/01500/2014]
dc.description.sponsorshipEUEuropean Union (EU) [HPRI-CT-2001-00120, MD03-2699]
dc.identifier.doi10.1016/j.gloplacha.2018.10.011
dc.identifier.issn0921-8181
dc.identifier.issn1872-6364
dc.identifier.urihttp://hdl.handle.net/10400.1/14488
dc.language.isoeng
dc.peerreviewedyes
dc.publisherElsevier
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.subjectNorth-Atlantic oscillation
dc.subjectScale climate variability
dc.subjectMillennial-scale
dc.subjectCalcareous plankton
dc.subjectCoccolithophore assemblages
dc.subjectPleistocene fluctuations
dc.subjectEquatorial insolation
dc.subjectWestern Iberia
dc.subjectSouth Atlantic
dc.subjectCurrent system
dc.titleSurface-ocean dynamics during eccentricity minima: a comparison between interglacial Marine Isotope Stage (MIS) 1 and MIS 11 on the Iberian Margin
dc.typejournal article
dspace.entity.typePublication
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.awardURIinfo:eu-repo/grantAgreement/FCT/PDCT/PDCT%2FMAR%2F58282%2F2004/PT
oaire.citation.endPage255
oaire.citation.startPage242
oaire.citation.titleGlobal and Planetary Change
oaire.citation.volume172
oaire.fundingStreamPDCT
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.nameFundação para a Ciência e a Tecnologia
rcaap.rightsrestrictedAccess
rcaap.typearticle
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relation.isAuthorOfPublication.latestForDiscoverybca80a86-eb35-4bca-a4ba-85b53831d69e
relation.isProjectOfPublicationd8e216cd-ca2b-4b9c-bdd6-989279055835
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