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Surface and deep water variability in the Western Mediterranean (ODP Site 975) during insolation cycle 74: high-resolution calcareous plankton and molecular biomarker signals

2020-03Journal article Restricted
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dc.contributor.authorQuivelli, Ornella
dc.contributor.authorMarino, Maria
dc.contributor.authorRodrigues, Teresa
dc.contributor.authorGirone, Angela
dc.contributor.authorMaiorano, Patrizia
dc.contributor.authorAbrantes, Fatima
dc.contributor.authorSalgueiro, Emilia
dc.contributor.authorBassinot, Frank
dc.date.accessioned2021-06-24T11:35:48Z
dc.date.available2021-06-24T11:35:48Z
dc.date.issued2020-03
dc.description.abstractWe reconstructed changes in productivity and surface/subsurface and deep-water dynamics in the Western Mediterranean through a multi-proxy study of Ocean Drilling Program Site 975 between late Marine Isotope Stage (MIS) 20 and early interglacial MIS 19. Our high-resolution study (down to similar to 200-year resolution) combines calcareous plankton assemblages (coccolithophores and foraminifera), biomarkers (C-37-alkenones, n-alkanes, n-alcohols) and elemental proxies (total organic carbon, total nitrogen, calcium carbonate). Surface water conditions are derived (i) from high-resolution delta O-18 and delta C-13 records obtained from the planktonic foraminifer Globigerina bulloides, and (ii) from summer and winter, foraminifera-based sea surface temperature reconstructions (SSTJAS-foram, SSTJFM-foram) achieved through transfer function. The integration of the whole dataset makes it possible to identify in the Balearic Sea, and to accurately characterize for the first time, an Organic Rich Layer (ORL) during latest MIS 20-early MIS 19, close to i-cycle 74. Its presence is marked firstly by higher values of total nitrogen (TN) and an increase of total C-37-alkenone and total organic carbon (TOC) preserved in the sediments. The multi-proxy approach reveals that the deglacial phase played a prominent role for ORL formation that was characterized by centennial scale phases. The alcohol preservation index (API) suggests that the shoaling of the circulation, which boosted marine productivity, started in the deglaciation and, in combination with freshening by Atlantic water inflow/riverine input and surface water buoyancy during sea level rising, culminated during the ORL event. At this time calcareous plankton proliferated on subsurface-surface waters, benefiting from ameliorating conditions, which promoted maximum marine productivity and higher organic matter preservation on the seafloor.
dc.description.sponsorshipGeoscience PhD scholarship, University degli Studi di Bari
dc.description.sponsorshipFundacao para a Ciencia e a TecnologiaPortuguese Foundation for Science and TechnologyEuropean Commission [SFRH/BPD/111433/2015]
dc.description.sponsorshipdell'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.versioninfo:eu-repo/semantics/publishedVersion
dc.identifier.doi10.1016/j.palaeo.2019.109583
dc.identifier.issn0031-0182
dc.identifier.urihttp://hdl.handle.net/10400.1/16542
dc.language.isoeng
dc.peerreviewedyes
dc.publisherElsevier
dc.subjectMIS 19
dc.subjectCoccolithophores
dc.subjectPlanktonic foraminifera
dc.subjectC-37-alkenones
dc.subjectTerrigenous biomarkers
dc.subjectOrganic-rich layer
dc.titleSurface and deep water variability in the Western Mediterranean (ODP Site 975) during insolation cycle 74: high-resolution calcareous plankton and molecular biomarker signals
dc.typejournal article
dspace.entity.typePublication
oaire.citation.startPage109583
oaire.citation.titlePalaeogeography Palaeoclimatology Palaeoecology
oaire.citation.volume542
person.familyNameRodrigues
person.familyNameAbrantes
person.familyNameSalgueiro
person.givenNameTeresa
person.givenNameFatima
person.givenNameEmilia
person.identifier.ciencia-idEC18-2390-9594
person.identifier.ciencia-id021D-CA76-20D2
person.identifier.ciencia-id3B10-07FD-161C
person.identifier.orcid0000-0001-7811-7506
person.identifier.orcid0000-0002-9110-0212
person.identifier.orcid0000-0003-1000-2977
person.identifier.ridG-2912-2013
person.identifier.ridB-5985-2013
person.identifier.ridG-1019-2013
person.identifier.scopus-author-id7004330274
person.identifier.scopus-author-id16030759200
person.identifier.scopus-author-id23486371200
rcaap.rightsrestrictedAccess
rcaap.typearticle
relation.isAuthorOfPublication0a137e49-be7a-4e12-85e2-3def90980f7e
relation.isAuthorOfPublication45b2d36a-1a11-4b6c-81b3-47f657904207
relation.isAuthorOfPublication593c3729-1fc6-43be-af73-42c6d32344c9
relation.isAuthorOfPublication.latestForDiscovery0a137e49-be7a-4e12-85e2-3def90980f7e

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