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Climate changes in south western Iberia and Mediterranean Outflow variations during two contrasting cycles of the last 1 Myrs: MIS 31-MIS 30 and MIS 12-MIS 11

2016-07Journal article Restricted access
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dc.contributor.authorGoni, Maria F. Sanchez
dc.contributor.authorLlave, E.
dc.contributor.authorOliveira, D.
dc.contributor.authorNaughton, F.
dc.contributor.authorDesprat, S.
dc.contributor.authorDucassou, E.
dc.contributor.authorHodell, D. A.
dc.contributor.authorHernandez-Molina, Francisco J.
dc.date.accessioned2017-04-07T15:57:39Z
dc.date.available2017-04-07T15:57:39Z
dc.date.issued2016-07
dc.description.abstractGrain size analysis and physical properties of Sites U1388, U1389 and TJ1390 collected in the Contourite Depositional System of the Gulf of Cadiz during the Integrated Ocean Drilling Program (IODP) Expedition 339 "Mediterranean Outflow" reveal relative changes in bottom current strength, a tracer of the dynamics of the Mediterranean Outflow Water (MOW), before and after the Middle Pleistocene Transition (MPT). The comparison of MOW behavior with climate changes identified by the pollen analysis and 8180 benthic foraminifera measurements of Site U1385, the Shackleton Site, collected in the south western Iberian margin shows that the interval MIS 31-MIS 30,similar to 1.1-1.05 million years ago (Ma), before the MPT, was marked by wetter climate and weaker bottom current than the interval MIS 12-MIS 11 (0.47-0.39 Ma), after the MPT. Similarly, the increase in fine particles from these glacials to interglacials and in coarse fraction from interglacials to glacials was coeval with forest and semi-desert expansions, respectively, indicating the lowering/enhancement of MOW strength during periods of regional increase/decrease of moisture. While these findings may not necessarily apply to all glacial/interglacial cycles, they nonetheless serve as excellent supporting examples of the hypothesis that aridification can serve as a good tracer for MOW intensity. The strongest regional aridity during MIS 12 coincides with a remarkable increase of coarse grain size deposition and distribution that we interpret as a maximum in MOW strength. This MOW intensification may have pre-conditioned the North Atlantic by increasing salinity, thereby triggering the strong resumption of the Meridional Overturning Circulation that could contribute to the great warmth that characterizes the MIS 11c super-interglacial. (C) 2015 Elsevier B.V. All rights reserved.
dc.description.sponsorshipCTM 2012-39599-C03, CGL2011-16057-E, IGCP619, and INQUA 1204 Projects; WarmClim, a LEFE-INSU IMAGO project; Chronostratigraphy of Site U1385; Continental Margins Research Group of the Royal Holloway University of London.
dc.identifier.doi10.1016/j.gloplacha.2015.11.006
dc.identifier.issn0921-8181
dc.identifier.urihttp://hdl.handle.net/10400.1/9776
dc.language.isoeng
dc.peerreviewedyes
dc.relation.isbasedonWOS:000369200800002
dc.titleClimate changes in south western Iberia and Mediterranean Outflow variations during two contrasting cycles of the last 1 Myrs: MIS 31-MIS 30 and MIS 12-MIS 11
dc.typejournal article
dspace.entity.typePublication
oaire.citation.endPage29
oaire.citation.startPage18
oaire.citation.titleGlobal and Planetary Change
oaire.citation.volume136
person.familyNameNaughton
person.givenNameFilipa
person.identifierR-000-JPJ
person.identifier.ciencia-id1419-F239-1CEA
person.identifier.orcid0000-0002-3055-9396
person.identifier.ridE-7659-2013
person.identifier.scopus-author-id23009659300
rcaap.rightsrestrictedAccess
rcaap.typearticle
relation.isAuthorOfPublication53f17112-41aa-4bd9-a437-50736dbde6f9
relation.isAuthorOfPublication.latestForDiscovery53f17112-41aa-4bd9-a437-50736dbde6f9

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