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Unexpected weak seasonal climate in the western Mediterranean region during MIS 31, a high-insolation forced interglacial

2017-04Journal article Restricted
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dc.contributor.authorOliveira, Dulce
dc.contributor.authorGoni, Maria F. Sanchez
dc.contributor.authorNaughton, Filipa
dc.contributor.authorPolanco-Martinez, J. M.
dc.contributor.authorJiménez-Espejo, Francisco J.
dc.contributor.authorGrimalt, Joan O.
dc.contributor.authorMartrat, Belen
dc.contributor.authorVoelker, Antje
dc.contributor.authorTrigo, Ricardo
dc.contributor.authorHodell, David
dc.contributor.authorAbrantes, Fatima
dc.contributor.authorDesprat, Stephanie
dc.date.accessioned2019-11-20T15:07:43Z
dc.date.available2019-11-20T15:07:43Z
dc.date.issued2017-04
dc.description.abstractMarine Isotope Stage 31 (MIS 31) is an important analogue for ongoing and projected global warming, yet key questions remain about the regional signature of its extreme orbital forcing and intra-interglacial variability. Based on a new direct land-sea comparison in SW Iberian margin IODP Site U1385 we examine the climatic variability between 1100 and 1050 ka including the "super interglacial" MIS 31, a period dominated by the 41-ky obliquity periodicity. Pollen and biomarker analyses at centennial-scale resolution provide new insights into the regional vegetation, precipitation regime and atmospheric and oceanic temperature variability on orbital and suborbital timescales. Our study reveals that atmospheric and SST warmth during MIS 31 was not exceptional in this region highly sensitive to precession. Unexpectedly, this warm stage stands out as a prolonged interval of a temperate and humid climate regime with reduced seasonality, despite the high insolation (precession minima values) forcing. We find that the dominant forcing on the long-term temperate forest development was obliquity, which may have induced a decrease in summer dryness and associated reduction in seasonal precipitation contrast. Moreover, this study provides the first evidence for persistent atmospheric millennial-scale variability during this interval with multiple forest decline events reflecting repeated cooling and drying episodes in SW Iberia. Our direct land-sea comparison shows that the expression of the suborbital cooling events on SW Iberian ecosystems is modulated by the predominance of high or low-latitude forcing depending on the glacial/interglacial baseline climate states. Severe dryness and air-sea cooling is detected under the larger ice volume during glacial MIS 32 and MIS 30. The extreme episodes, which in their climatic imprint are similar to the Heinrich events, are likely related to northern latitude ice-sheet instability and a disruption of the Atlantic Meridional Overturning Circulation (AMOC). In contrast, forest declines during MIS 31 are associated to neither SST cooling nor high-latitude freshwater forcing. Time-series analysis reveals a dominant cyclicity of about 6 ky in the temperate forest record, which points to a potential link with the fourth harmonic of precession and thus low-latitude insolation forcing. (C) 2017 Elsevier Ltd. All rights reserved.
dc.description.sponsorshipWarmClim
dc.description.sponsorshipLEFE-INSU IMAGO project
dc.description.sponsorshipPortuguese Foundation for Science and Technology (FCT) through the project CLIMHOL [PTDC/AAC-CLI/100157/2008]
dc.description.sponsorshipD. Oliveira's doctoral grant [SFRH/BD/9079/2012]
dc.description.sponsorshipF. Naughton's postdoctoral grant [SFRH/BPD/108712/2015]
dc.description.sponsorshipA. Voelker's IF contract
dc.description.sponsorshipBasque Government post-doctoral fellowship [POS_2015_1_0006]
dc.description.sponsorshipB. Martrat by a Ramon y Cajal contract [RYC-2013-14073]
dc.description.sponsorshipIntegrated Ocean Drilling Program (IODP)
dc.description.sponsorshipNatural Environment Research Council [NE/J017922/1, NE/K005804/1]
dc.description.versioninfo:eu-repo/semantics/publishedVersion
dc.identifier.doi10.1016/j.quascirev.2017.02.013
dc.identifier.issn0277-3791
dc.identifier.urihttp://hdl.handle.net/10400.1/13179
dc.language.isoeng
dc.peerreviewedyes
dc.publisherPergamon-Elsevier Science Ltd
dc.rights.urihttp://creativecommons.org/licenses/by/4.0/
dc.subjectAntarctic ice-sheet
dc.subjectNorth-Atlantic Ocean
dc.subjectMiddle pleistocene transition
dc.subjectMillennial-scale changes
dc.subjectIsotope stage 31
dc.subjectMidpleistocene transition
dc.subjectLake elgygytgyn
dc.subjectEquatorial insolation
dc.subjectIberian Peninsula
dc.subjectTropical Pacific
dc.titleUnexpected weak seasonal climate in the western Mediterranean region during MIS 31, a high-insolation forced interglacial
dc.typejournal article
dspace.entity.typePublication
oaire.awardURIinfo:eu-repo/grantAgreement/FCT/5876-PPCDTI/PTDC%2FAAC-CLI%2F100157%2F2008/PT
oaire.citation.endPage17
oaire.citation.startPage1
oaire.citation.titleQuaternary Science Reviews
oaire.citation.volume161
oaire.fundingStream5876-PPCDTI
person.familyNameOliveira
person.familyNameNaughton
person.familyNameVoelker
person.familyNameAbrantes
person.givenNameDulce
person.givenNameFilipa
person.givenNameAntje
person.givenNameFatima
person.identifierR-001-TTY
person.identifierR-000-JPJ
person.identifier2315310
person.identifier.ciencia-idA119-CA60-3C50
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person.identifier.ciencia-idC11E-D8E6-CDFA
person.identifier.ciencia-id021D-CA76-20D2
person.identifier.orcid0000-0002-3016-532X
person.identifier.orcid0000-0002-3055-9396
person.identifier.orcid0000-0001-6465-6023
person.identifier.orcid0000-0002-9110-0212
person.identifier.ridH-9855-2018
person.identifier.ridE-7659-2013
person.identifier.ridC-5427-2012
person.identifier.ridB-5985-2013
person.identifier.scopus-author-id56688169500
person.identifier.scopus-author-id23009659300
person.identifier.scopus-author-id8784446000
person.identifier.scopus-author-id16030759200
project.funder.identifierhttp://doi.org/10.13039/501100001871
project.funder.nameFundação para a Ciência e a Tecnologia
rcaap.rightsrestrictedAccess
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