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Pollen from the deep-sea: A breakthrough in the mystery of the ice ages

2018Journal article Open access
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dc.contributor.authorGoni, Maria F. Sanchez
dc.contributor.authorDesprat, Stephanie
dc.contributor.authorFletcher, William J.
dc.contributor.authorMorales-Molino, Cesar
dc.contributor.authorNaughton, Filipa
dc.contributor.authorOliveira, Dulce
dc.contributor.authorUrrego, Dunia H.
dc.contributor.authorZorzi, Coralie
dc.date.accessioned2018-12-07T14:53:26Z
dc.date.available2018-12-07T14:53:26Z
dc.date.issued2018
dc.description.abstractPollen from deep-sea sedimentary sequences provides an integrated regional reconstruction of vegetation and climate (temperature, precipitation, and seasonality) on the adjacent continent. More importantly, the direct correlation of pollen, marine and ice indicators allows comparison of the atmospheric climatic changes that have affected the continent with the response of the Earth's other reservoirs, i.e., the oceans and cryosphere, without any chronological uncertainty. The study of long continuous pollen records from the European margin has revealed a changing and complex interplay between European climate, North Atlantic sea surface temperatures (SSTs), ice growth and decay, and high-and low-latitude forcing at orbital and millennial timescales. These records have shown that the amplitude of the last five terrestrial interglacials was similar above 40 degrees N, while below 40 degrees N their magnitude differed due to precession-modulated changes in seasonality and, particularly, winter precipitation. These records also showed that vegetation response was in dynamic equilibrium with rapid climate changes such as the Dangaard-Oeschger (D-O) cycles and Heinrich events, similar in magnitude and velocity to the ongoing global warming. However, the magnitude of the millennial-scale warming events of the last glacial period was regionally-specific. Precession seems to have imprinted regions below 40 degrees N while obliquity, which controls average annual temperature, probably mediated the impact of D-O warming events above 40 degrees N. A decoupling between high-and low-latitude climate was also observed within last glacial warm (Greenland interstadials) and cold phases (Greenland stadials). The synchronous response of western European vegetation/climate and eastern North Atlantic SSTs to D-O cycles was not a pervasive feature throughout the Quaternary. During periods of ice growth such as MIS 5a/4, MIS 11c/b and MIS 19c/b, repeated millennial-scale cold-air/warm-sea decoupling events occurred on the European margin superimposed to a long-term air-sea decoupling trend. Strong air-sea thermal contrasts promoted the production of water vapor that was then transported northward by the westerlies and fed ice sheets. This interaction between long-term and shorter timescale climatic variability may have amplified insolation decreases and thus explain the Ice Ages. This hypothesis should be tested by the integration of stochastic processes in Earth models of intermediate complexity.
dc.identifier.doi10.3389/fpls.2018.00038
dc.identifier.issn1664-462X
dc.identifier.urihttp://hdl.handle.net/10400.1/11515
dc.language.isoeng
dc.peerreviewedyes
dc.publisherFrontiers Media Sa
dc.relationUnderstanding past abrupt climate instabilities in the North Atlantic Region (ULTImATum)
dc.relationUNDERSTANDING WARM PERIODS WITHIN AND AFTER THE MID PLEISTOCENE REVOLUTION MIS 31 AND 11 IN THE IBERIAN MARGIN
dc.subjectLast Glacial Period
dc.subjectSubpolar North-Atlantic
dc.subjectMeridional Overturning Circulation
dc.subjectMillennial-Scale Variability
dc.subjectClimatic Variability
dc.subjectIberian Margin
dc.subjectOcean Circulation
dc.subjectGreenland Ice
dc.subjectAntarctic Ice
dc.subjectInterglacial Complex
dc.titlePollen from the deep-sea: A breakthrough in the mystery of the ice ages
dc.typejournal article
dspace.entity.typePublication
oaire.awardTitleUnderstanding past abrupt climate instabilities in the North Atlantic Region (ULTImATum)
oaire.awardTitleUNDERSTANDING WARM PERIODS WITHIN AND AFTER THE MID PLEISTOCENE REVOLUTION MIS 31 AND 11 IN THE IBERIAN MARGIN
oaire.awardURIinfo:eu-repo/grantAgreement/FCT/5876-PPCDTI/PTDC%2FAAC-CLI%2F100157%2F2008/PT
oaire.awardURIinfo:eu-repo/grantAgreement/FCT/Investigador FCT/IF%2F01489%2F2015%2FCP1296%2FCT0001/PT
oaire.awardURIinfo:eu-repo/grantAgreement/FCT//SFRH%2FBD%2F90790%2F2012/PT
oaire.citation.startPage38
oaire.citation.titleFrontiers In Plant Science
oaire.citation.volume9
oaire.fundingStream5876-PPCDTI
oaire.fundingStreamInvestigador FCT
person.familyNameNaughton
person.familyNameOliveira
person.givenNameFilipa
person.givenNameDulce
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person.identifier.ciencia-id1419-F239-1CEA
person.identifier.ciencia-idA119-CA60-3C50
person.identifier.orcid0000-0002-3055-9396
person.identifier.orcid0000-0002-3016-532X
person.identifier.ridE-7659-2013
person.identifier.ridH-9855-2018
person.identifier.scopus-author-id23009659300
person.identifier.scopus-author-id56688169500
project.funder.identifierhttp://doi.org/10.13039/501100001871
project.funder.identifierhttp://doi.org/10.13039/501100001871
project.funder.identifierhttp://doi.org/10.13039/501100001871
project.funder.nameFundação para a Ciência e a Tecnologia
project.funder.nameFundação para a Ciência e a Tecnologia
project.funder.nameFundação para a Ciência e a Tecnologia
rcaap.rightsopenAccess
rcaap.typearticle
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