Changes in the intermediate water masses of the Mediterranean Sea during the last climatic cycle-new constraints from neodymium isotopes in foraminifera

dc.contributor.author Colin, Christophe
dc.contributor.author Duhamel, Maxence
dc.contributor.author Siani, Giuseppe
dc.contributor.author Dubois-Dauphin, Quentin
dc.contributor.author Ducassou, Emmanuelle
dc.contributor.author Liu, Zhifei
dc.contributor.author Wu, Jiawang
dc.contributor.author Revel, Marie
dc.contributor.author Dapoigny, Arnaud
dc.contributor.author Douville, Eric
dc.contributor.author Taviani, Marco
dc.contributor.author Montagna, Paolo
dc.date.accessioned 2021-07-29T14:30:08Z
dc.date.available 2021-08-15T06:19:04Z
dc.date.issued 2021-02-15
dc.description Author Posting. © American Geophysical Union, 2021. This article is posted here by permission of American Geophysical Union for personal use, not for redistribution. The definitive version was published in Paleoceanography and Paleoclimatology, 36(4), (2021): e2020PA004153, https://doi.org/10.1029/2020PA004153. en_US
dc.description.abstract Variations in Mediterranean thermohaline circulation of the Quaternary are still not well constrained whereas they have been considered to have an influence on the Atlantic Meridional Overturning Circulation and on the oxygenation of waters in the deep basins of the Mediterranean Sea. εNd analyses have been carried out on planktonic foraminifera of cores collected in the central Mediterranean Sea to constrain water mass exchange between the Eastern and Western Mediterranean Sea (EMS and WMS) during the last climatic cycle. εNd records from the WMS and EMS display similar higher values during warm substages of interglacial Marine Isotopic Stage (MIS) 1 and 5. This suggests an efficient connection between the two Mediterranean sub-basins and the transfer of radiogenic waters to the Tyrrhenian Sea via the Levantine Intermediate Water (LIW). Conversely, during glacial MIS, εNd of the intermediate depth of the Tyrrhenian Sea are less radiogenic than the EMS, implying limited hydrological connection between sub-basins during low sea-level stands. Superimposed on these glacial-interglacial variations, increased εNd occurred during Heinrich Stadial events. This suggests a reduction in the formation of unradiogenic WIW in the Gulf of Lions due to the input of relatively fresh surface Atlantic water to the WMS and/or the inflow of radiogenic glacial LIW and upper EMDW to the Tyrrhenian Sea as a result of an active EMS convection related to saltier and colder conditions. Such potential millennial-scale pulses of LIW intrusion into the Tyrrhenian Sea may have led to an enhanced Mediterranean Outflow Water intensity in the Gibraltar Strait. en_US
dc.description.embargo 2021-08-15 en_US
dc.description.sponsorship The research leading to this paper was funded by the French National Research Agency under the “Investissements d'avenir” program (Grant ANR-11-IDEX-0004-17-EURE-0006), the MEDSENS Project (Grant ANR-19-CE01-0019) and the INSU LEFE-IMAGO PALMEDS Project. The authors gratefully acknowledge the support provided by Louise Bordier during Nd isotopic composition analyses. en_US
dc.identifier.citation Colin, C., Duhamel, M., Siani, G., Dubois-Dauphin, Q., Ducassou, E., Liu, Z., Wu, J., Revel, M., Dapoigny, A., Douville, E., Taviani, M., & Montagna, P. (2021). Changes in the intermediate water masses of the Mediterranean Sea during the last climatic cycle-new constraints from neodymium isotopes in foraminifera. Paleoceanography and Paleoclimatology, 36(4), e2020PA004153. en_US
dc.identifier.doi 10.1029/2020PA004153
dc.identifier.uri https://hdl.handle.net/1912/27388
dc.publisher American Geophysical Union en_US
dc.relation.uri https://doi.org/10.1029/2020PA004153
dc.subject Central Mediterranean Sea en_US
dc.subject foraminifera en_US
dc.subject last climatic cycle en_US
dc.subject Neodymium isotopic composition en_US
dc.subject paleo-hydrology en_US
dc.subject sapropels en_US
dc.title Changes in the intermediate water masses of the Mediterranean Sea during the last climatic cycle-new constraints from neodymium isotopes in foraminifera en_US
dc.type Article en_US
dspace.entity.type Publication
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