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

Type Article
Date 2021-04
Language English
Author(s) Colin Christophe1, Duhamel Maxence1, Siani GiuseppeORCID1, Dubois‐dauphin Quentin1, Ducassou Emmanuelle2, Liu ZhifeiORCID3, Wu JiawangORCID3, Revel Marie4, Dapoigny Arnaud5, Douville Eric5, Taviani Marco6, Montagna PaoloORCID7
Affiliation(s) 1 : Université Paris‐Saclay CNRS GEOPS 91405 Orsay ,France
2 : Université de Bordeaux UMR‐CNRS 5805‐EPOC Allée Geoffroy St Hilaire33615 Pessac Cedex ,France
3 : State Key Laboratory of Marine Geology Tongji University Shanghai200092, China
4 : Université de la Cote d'Azur CNRS OCA IRD, Geoazur 250 rue Albert Einstein06500 Valbonne, France
5 : Laboratoire des Sciences du Climat et de l'Environnement LSCE/IPSL CEA‐CNRS‐UVSQ Université Paris‐Saclay F‐91191 Gif‐sur‐Yvette, France
6 : Institute of Marine Science ISMAR‐CNR Via Gobetti 10140129 Bologna ,Italy
7 : Institute of Polar Sciences ISP‐CNR, Via Gobetti 10140129 Bologna, Italy
Source Paleoceanography And Paleoclimatology (2572-4517) (American Geophysical Union (AGU)), 2021-04 , Vol. 36 , N. 4 , P. e2020PA004153 (28p.)
DOI 10.1029/2020PA004153
WOS© Times Cited 3
Keyword(s) Central Mediterranean Sea, foraminifera, last climatic cycle, Neodymium isotopic composition, paleo&#8208, hydrology, sapropels

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 lead to an enhanced Mediterranean Outflow Water intensity in the Gibraltar Strait.

Full Text
File Pages Size Access
Publisher's official version 53 3 MB Open access
Supporting Information S1 85 KB Open access
Top of the page

How to cite 

Colin Christophe, Duhamel Maxence, Siani Giuseppe, Dubois‐dauphin Quentin, Ducassou Emmanuelle, Liu Zhifei, Wu Jiawang, Revel Marie, Dapoigny Arnaud, Douville Eric, Taviani Marco, Montagna Paolo (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 (28p.). Publisher's official version : , Open Access version :