气候变化领域集成服务门户(CCPortal): Variations in eastern Mediterranean hydrology during the last climatic cycle as inferred from neodymium isotopes in foraminifera

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DOI	10.1016/j.quascirev.2020.106306
	Variations in eastern Mediterranean hydrology during the last climatic cycle as inferred from neodymium isotopes in foraminifera
	Duhamel M.; Colin C.; Revel M.; Siani G.; Dapoigny A.; Douville E.; Wu J.; Zhao Y.; Liu Z.; Montagna P.
发表日期	2020
ISSN	0277-3791
卷号	237
英文摘要	The Nd isotopic compositions (εNd) of mixed planktonic foraminifera have been analyzed in two sediment cores collected in the Nile deep-sea fan in order to reconstruct past εNd of the Eastern Mediterranean Deep Water (EMDW) and to assess the relative contributions of Nile discharge and Modified Atlantic Water (MAW) inflow to the Eastern Mediterranean Sea hydrology, as well as their potential control on anoxic events over the last climatic cycle. The two foraminiferal εNd records are similar and display an increase in εNd values during the African Humid Periods. Superimposed on this precession-forced variability (insolation received by the Earth at low latitudes), the record of variations in foraminiferal εNd indicates a 2-unit decrease in εNd during the interglacial Marine Isotope Stages (MIS) 5 and 1 compared to glacial MIS6, 4, 3 and 2. The εNd results suggest that the long-term glacial to interglacial changes in Nd isotopic composition of EMDW were not entirely induced by variations in Nile River discharge and Saharan dust inputs. Decreases in εNd during MIS5 and MIS1 interglacials indicate an increase in the contribution of unradiogenic MAW to the eastern Mediterranean Sea related to high sea-level stands and greater seawater exchange between the North Atlantic and Mediterranean basins. In addition, radiogenic seawater εNd values observed during African Humid Periods (and sapropel events) are associated with an intensification of Nile discharge and an increase in residence time of deep-water masses in the eastern Mediterranean Sea, which induces an increase in the interaction between deep-water masses and radiogenic sediments along the margin of the eastern Mediterranean Sea. Results confirm that an intensification of the hydrological exchanges between the western and eastern Mediterranean basins during high sea-level stand and the subsequent higher proportion of Atlantic Water in the Levantine Basin may have preconditioned the eastern Mediterranean Sea to sapropel depositions during the last climatic cycle. © 2020 Elsevier Ltd
英文关键词	African monsoon; Eastern Mediterranean sea; Foraminifera; Neodymium isotopes; Paleo-hydrology; Sapropels
语种	英语
scopus关键词	Glacial geology; Hydrology; Mooring; Neodymium; Sea level; Seawater; Sediments; Eastern Mediterranean; Eastern Mediterranean sea; Marine isotope stages; Mediterranean basin; Nd isotopic compositions; Neodymium isotopes; Planktonic foraminifera; Relative contribution; Isotopes; anoxic conditions; climate cycle; glacial-interglacial cycle; isotopic composition; marine environment; neodymium isotope; planktonic foraminifera; residence time; seawater; sediment core; Atlantic Ocean; Atlantic Ocean (North); Levantine Sea; Levantine Sea; Mediterranean Sea; Mediterranean Sea (East); Nile River; Foraminifera; Gorgonacea
来源期刊	Quaternary Science Reviews
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/151474
作者单位	Université Paris-Saclay, CNRS, GEOPS, Orsay, 91405, France; Université de la Cote d'Azur, CNRS, OCA, IRD, Geoazur, 250 rue Albert EinsteinValbonne 06500, France; Laboratoire des Sciences du Climat et de l'Environnement, LSCE/IPSL, CEA-CNRS-UVSQ, Université Paris-SaclayGif-sur-Yvette F-91191, France; State Key Laboratory of Marine Geology, Tongji University, Shanghai, 200092, China; ISP-CNR, Via Gobetti 101, Bologna, 40129, Italy
推荐引用方式 GB/T 7714	Duhamel M.,Colin C.,Revel M.,et al. Variations in eastern Mediterranean hydrology during the last climatic cycle as inferred from neodymium isotopes in foraminifera[J],2020,237.
APA	Duhamel M..,Colin C..,Revel M..,Siani G..,Dapoigny A..,...&Montagna P..(2020).Variations in eastern Mediterranean hydrology during the last climatic cycle as inferred from neodymium isotopes in foraminifera.Quaternary Science Reviews,237.
MLA	Duhamel M.,et al."Variations in eastern Mediterranean hydrology during the last climatic cycle as inferred from neodymium isotopes in foraminifera".Quaternary Science Reviews 237(2020).