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dc.contributor.authorDubois-Dauphin, Quentin  Concept link
dc.contributor.authorMontagna, Paolo  Concept link
dc.contributor.authorSiani, Giuseppe  Concept link
dc.contributor.authorDouville, Eric  Concept link
dc.contributor.authorWienberg, Claudia  Concept link
dc.contributor.authorHebbeln, Dierk  Concept link
dc.contributor.authorLiu, Zhifei  Concept link
dc.contributor.authorKallel, Nejib  Concept link
dc.contributor.authorDapoigny, Arnaud  Concept link
dc.contributor.authorRevel, Marie  Concept link
dc.contributor.authorPons-Branchu, Edwige  Concept link
dc.contributor.authorTaviani, Marco  Concept link
dc.contributor.authorColin, Christophe  Concept link
dc.identifier.citationClimate of the Past 13 (2017): 17-37en_US
dc.description© The Author(s), 2017. This article is distributed under the terms of the Creative Commons Attribution License. The definitive version was published in Climate of the Past 13 (2017): 17-37, doi:10.5194/cp-13-17-2017.en_US
dc.description.abstractWe present the neodymium isotopic composition (εNd) of mixed planktonic foraminifera species from a sediment core collected at 622 m water depth in the Balearic Sea, as well as εNd of scleractinian cold-water corals (CWC; Madrepora oculata, Lophelia pertusa) retrieved between 280 and 442 m water depth in the Alboran Sea and at 414 m depth in the southern Sardinian continental margin. The aim is to constrain hydrological variations at intermediate depths in the western Mediterranean Sea during the last 20 kyr. Planktonic (Globigerina bulloides) and benthic (Cibicidoides pachyderma) foraminifera from the Balearic Sea were also analyzed for stable oxygen (δ18O) and carbon (δ13C) isotopes. The foraminiferal and coral εNd values from the Balearic and Alboran seas are comparable over the last  ∼  13 kyr, with mean values of −8.94 ± 0.26 (1σ; n =  24) and −8.91 ± 0.18 (1σ; n =  25), respectively. Before 13 ka BP, the foraminiferal εNd values are slightly lower (−9.28 ± 0.15) and tend to reflect higher mixing between intermediate and deep waters, which are characterized by more unradiogenic εNd values. The slight εNd increase after 13 ka BP is associated with a decoupling in the benthic foraminiferal δ13C composition between intermediate and deeper depths, which started at  ∼  16 ka BP. This suggests an earlier stratification of the water masses and a subsequent reduced contribution of unradiogenic εNd from deep waters. The CWC from the Sardinia Channel show a much larger scatter of εNd values, from −8.66 ± 0.30 to −5.99 ± 0.50, and a lower average (−7.31 ± 0.73; n =  19) compared to the CWC and foraminifera from the Alboran and Balearic seas, indicative of intermediate waters sourced from the Levantine basin. At the time of sapropel S1 deposition (10.2 to 6.4 ka), the εNd values of the Sardinian CWC become more unradiogenic (−8.38 ± 0.47; n =  3 at  ∼  8.7 ka BP), suggesting a significant contribution of intermediate waters originated from the western basin. We propose that western Mediterranean intermediate waters replaced the Levantine Intermediate Water (LIW), and thus there was a strong reduction of the LIW during the mid-sapropel ( ∼  8.7 ka BP). This observation supports a notable change of Mediterranean circulation pattern centered on sapropel S1 that needs further investigation to be confirmed.en_US
dc.description.sponsorshipThe research leading to this study has received funding from the MISTRALS/PALEOMEX/COFIMED, the French National Research Agency “Investissement d’Avenir” (n°ANR-10-LABX-0018), the HAMOC project ANR-13-BS06- 0003 and ENVIMED/Boron Isotope and Trace Elements project.en_US
dc.publisherCopernicus Publications on behalf of the European Geosciences Unionen_US
dc.rightsAttribution 3.0 Unported
dc.titleHydrological variations of the intermediate water masses of the western Mediterranean Sea during the past 20 ka inferred from neodymium isotopic composition in foraminifera and cold-water coralsen_US

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