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Holocene climate variability of the Western Mediterranean: surface water dynamics inferred from calcareous plankton assemblages

2020-05Journal article Open access
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dc.contributor.authorBazzicalupo, Pietro
dc.contributor.authorMaiorano, Patrizia
dc.contributor.authorGirone, Angela
dc.contributor.authorMarino, Maria
dc.contributor.authorCombourieu-Nebout, Nathalie
dc.contributor.authorPelosi, Nicola
dc.contributor.authorSalgueiro, Emilia
dc.contributor.authorIncarbona, Alessandro
dc.date.accessioned2021-06-24T11:36:02Z
dc.date.available2021-06-24T11:36:02Z
dc.date.issued2020-05
dc.description.abstractA high-resolution study (centennial scale) has been performed on the calcareous plankton assemblage of the Holocene portion of the Ocean Drilling Program Site 976 (Alboran Sea) with the aim to identify the main changes in the surface water dynamic. The dataset also provided a seasonal foraminiferal sea surface water temperatures (SSTs), estimated using the modern analog technique SIMMAX 28, and it was compared with available geochemical and pollen data at the site. Three main climate shifts were identified as (1) the increase in abundance of Syracosphaera spp. and Turborotalita quinqueloba marks the early Holocene humid phase, during maximum summer insolation and enhanced river runoff. It is concomitant with the expansion of Quercus, supporting high humidity on land. It ends at 8.2 ka, registering a sudden temperature and humidity reduction; (2) the rise in the abundances of Florisphaera profunda and Globorotalia inflata, at ca. 8 ka, indicates the development of the modern geostrophic front, gyre circulation, and of a deep nutricline following the sea-level rise; and (3) the increase of small Gephyrocapsa and Globigerina bulloides at 5.3 ka suggests enhanced nutrient availability in surface waters, related to more persistent wind-induced upwelling conditions. Relatively higher winter SST in the last 3.5 ka favored the increase of Trilobatus sacculifer, likely connected to more stable surface water conditions. Over the main trends, a short-term cyclicity is registered in coccolithophore productivity during the last 8 ka. Short periods of increased productivity are in phase with Atlantic waters inflow, and more arid intervals on land. This cyclicity has been related with periods of positive North Atlantic Oscillation (NAO) circulations. Spectral analysis on coccolithophore productivity confirms the occurrence of millennial-scale cyclicity, suggesting an external (i.e. solar) and an internal (i.e. atmospheric/oceanic) forcing.
dc.description.sponsorshipGeoscience PhD scholarship, Universita degli Studi di Bari
dc.description.sponsorshipPotenziamento Strutturale dell'Universita degli Studi di Bari, Laboratorio per lo Sviluppo Integrato delle Scienze e delle Tecnologie dei Materiali Avanzati e per dispositivi innovativi (SISTEMA) [PONa3_00369]
dc.description.sponsorshipFundacao para a Ciencia e a Tecnologia (FCT)Portuguese Foundation for Science and TechnologyEuropean Commission [SFRH/BPD/111433/2015]
dc.description.versioninfo:eu-repo/semantics/submittedVersion
dc.identifier.doi10.1177/0959683619895580
dc.identifier.issn0959-6836
dc.identifier.urihttp://hdl.handle.net/10400.1/16607
dc.language.isoeng
dc.peerreviewedyes
dc.publisherSage
dc.relationUnderstanding the hydrography and productivity variability during the beginning of Mid-Pleistocene Transition on the SW Portuguese Margin
dc.rights.urihttp://creativecommons.org/licenses/by/4.0/
dc.subjectAlboran Sea
dc.subjectCoccolithophores
dc.subjectForaminifera
dc.subjectHolocene
dc.subjectMillennial-centennial-scale climate variability
dc.subjectPaleoclimate
dc.subjectPaleoproductivity
dc.subject.otherPhysical Geography; Geology
dc.titleHolocene climate variability of the Western Mediterranean: surface water dynamics inferred from calcareous plankton assemblages
dc.typejournal article
dspace.entity.typePublication
oaire.awardTitleUnderstanding the hydrography and productivity variability during the beginning of Mid-Pleistocene Transition on the SW Portuguese Margin
oaire.awardURIinfo:eu-repo/grantAgreement/FCT/OE/SFRH%2FBPD%2F111433%2F2015/PT
oaire.citation.endPage708
oaire.citation.issue5
oaire.citation.startPage6910959683619895580
oaire.citation.titleHolocene
oaire.citation.volume30
oaire.fundingStreamOE
person.familyNameSalgueiro
person.givenNameEmilia
person.identifier.ciencia-id3B10-07FD-161C
person.identifier.orcid0000-0003-1000-2977
person.identifier.ridG-1019-2013
person.identifier.scopus-author-id23486371200
project.funder.identifierhttp://doi.org/10.13039/501100001871
project.funder.nameFundação para a Ciência e a Tecnologia
rcaap.rightsopenAccess
rcaap.typearticle
relation.isAuthorOfPublication593c3729-1fc6-43be-af73-42c6d32344c9
relation.isAuthorOfPublication.latestForDiscovery593c3729-1fc6-43be-af73-42c6d32344c9
relation.isProjectOfPublicationb087e374-1f31-468c-99c2-6e61b3d56fc0
relation.isProjectOfPublication.latestForDiscoveryb087e374-1f31-468c-99c2-6e61b3d56fc0

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