Variations in eastern Mediterranean hydrology during the last climatic cycle as inferred from neodymium isotopes in foraminifera
International audience 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 disc...
Published in: | Quaternary Science Reviews |
---|---|
Main Authors: | , , , , , , , , , |
Other Authors: | , , , , , , , , , , , , , |
Format: | Article in Journal/Newspaper |
Language: | English |
Published: |
HAL CCSD
2020
|
Subjects: | |
Online Access: | https://doi.org/10.1016/j.quascirev.2020.106306 https://hal.archives-ouvertes.fr/hal-02624107 |
id |
fttriple:oai:gotriple.eu:10670/1.jmlopt |
---|---|
record_format |
openpolar |
institution |
Open Polar |
collection |
Unknown |
op_collection_id |
fttriple |
language |
English |
topic |
envir geo |
spellingShingle |
envir geo Duhamel, Maxence Colin, Christophe Revel, Marie Siani, Giuseppe Dapoigny, Arnaud Douville, Éric Wu, Jiawang Zhao, Yulong Liu, Zhifei Montagna, Paolo Variations in eastern Mediterranean hydrology during the last climatic cycle as inferred from neodymium isotopes in foraminifera |
topic_facet |
envir geo |
description |
International audience 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 ... |
author2 |
Géosciences Paris Saclay (GEOPS) Institut national des sciences de l'Univers (INSU - CNRS)-Université Paris-Saclay-Centre National de la Recherche Scientifique (CNRS) Géoazur (GEOAZUR 7329) Institut national des sciences de l'Univers (INSU - CNRS)-Observatoire de la Côte d'Azur Université Côte d'Azur (UCA)-COMUE Université Côte d'Azur (2015-2019) (COMUE UCA)-Université Côte d'Azur (UCA)-COMUE Université Côte d'Azur (2015-2019) (COMUE UCA)-Centre National de la Recherche Scientifique (CNRS)-Institut de Recherche pour le Développement (IRD France-Sud ) Laboratoire des Sciences du Climat et de l'Environnement Gif-sur-Yvette (LSCE) Institut national des sciences de l'Univers (INSU - CNRS)-Université Paris-Saclay-Centre National de la Recherche Scientifique (CNRS)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université de Versailles Saint-Quentin-en-Yvelines (UVSQ) Géochrononologie Traceurs Archéométrie (GEOTRAC) Institut national des sciences de l'Univers (INSU - CNRS)-Université Paris-Saclay-Centre National de la Recherche Scientifique (CNRS)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université de Versailles Saint-Quentin-en-Yvelines (UVSQ)-Institut national des sciences de l'Univers (INSU - CNRS)-Université Paris-Saclay-Centre National de la Recherche Scientifique (CNRS)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université de Versailles Saint-Quentin-en-Yvelines (UVSQ) Tongji University State Key Laboratory of Marine Geology Shanghai Istituto di Science Marine (ISMAR ) Consiglio Nazionale delle Ricerche (CNR) ANR-19-CE01-0019,MEDSENS,Sensibilité de la circulation thermohaline en Mer Méditerranée : leçons du passé pour le futur(2019) |
format |
Article in Journal/Newspaper |
author |
Duhamel, Maxence Colin, Christophe Revel, Marie Siani, Giuseppe Dapoigny, Arnaud Douville, Éric Wu, Jiawang Zhao, Yulong Liu, Zhifei Montagna, Paolo |
author_facet |
Duhamel, Maxence Colin, Christophe Revel, Marie Siani, Giuseppe Dapoigny, Arnaud Douville, Éric Wu, Jiawang Zhao, Yulong Liu, Zhifei Montagna, Paolo |
author_sort |
Duhamel, Maxence |
title |
Variations in eastern Mediterranean hydrology during the last climatic cycle as inferred from neodymium isotopes in foraminifera |
title_short |
Variations in eastern Mediterranean hydrology during the last climatic cycle as inferred from neodymium isotopes in foraminifera |
title_full |
Variations in eastern Mediterranean hydrology during the last climatic cycle as inferred from neodymium isotopes in foraminifera |
title_fullStr |
Variations in eastern Mediterranean hydrology during the last climatic cycle as inferred from neodymium isotopes in foraminifera |
title_full_unstemmed |
Variations in eastern Mediterranean hydrology during the last climatic cycle as inferred from neodymium isotopes in foraminifera |
title_sort |
variations in eastern mediterranean hydrology during the last climatic cycle as inferred from neodymium isotopes in foraminifera |
publisher |
HAL CCSD |
publishDate |
2020 |
url |
https://doi.org/10.1016/j.quascirev.2020.106306 https://hal.archives-ouvertes.fr/hal-02624107 |
genre |
North Atlantic Planktonic foraminifera |
genre_facet |
North Atlantic Planktonic foraminifera |
op_source |
Hyper Article en Ligne - Sciences de l'Homme et de la Société ISSN: 0277-3791 Quaternary Science Reviews Quaternary Science Reviews, Elsevier, 2020, 237, pp.106306. ⟨10.1016/j.quascirev.2020.106306⟩ |
op_relation |
hal-02624107 doi:10.1016/j.quascirev.2020.106306 10670/1.jmlopt https://hal.archives-ouvertes.fr/hal-02624107 |
op_rights |
undefined |
op_doi |
https://doi.org/10.1016/j.quascirev.2020.106306 |
container_title |
Quaternary Science Reviews |
container_volume |
237 |
container_start_page |
106306 |
_version_ |
1766135401044508672 |
spelling |
fttriple:oai:gotriple.eu:10670/1.jmlopt 2023-05-15T17:36:03+02:00 Variations in eastern Mediterranean hydrology during the last climatic cycle as inferred from neodymium isotopes in foraminifera Duhamel, Maxence Colin, Christophe Revel, Marie Siani, Giuseppe Dapoigny, Arnaud Douville, Éric Wu, Jiawang Zhao, Yulong Liu, Zhifei Montagna, Paolo Géosciences Paris Saclay (GEOPS) Institut national des sciences de l'Univers (INSU - CNRS)-Université Paris-Saclay-Centre National de la Recherche Scientifique (CNRS) Géoazur (GEOAZUR 7329) Institut national des sciences de l'Univers (INSU - CNRS)-Observatoire de la Côte d'Azur Université Côte d'Azur (UCA)-COMUE Université Côte d'Azur (2015-2019) (COMUE UCA)-Université Côte d'Azur (UCA)-COMUE Université Côte d'Azur (2015-2019) (COMUE UCA)-Centre National de la Recherche Scientifique (CNRS)-Institut de Recherche pour le Développement (IRD France-Sud ) Laboratoire des Sciences du Climat et de l'Environnement Gif-sur-Yvette (LSCE) Institut national des sciences de l'Univers (INSU - CNRS)-Université Paris-Saclay-Centre National de la Recherche Scientifique (CNRS)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université de Versailles Saint-Quentin-en-Yvelines (UVSQ) Géochrononologie Traceurs Archéométrie (GEOTRAC) Institut national des sciences de l'Univers (INSU - CNRS)-Université Paris-Saclay-Centre National de la Recherche Scientifique (CNRS)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université de Versailles Saint-Quentin-en-Yvelines (UVSQ)-Institut national des sciences de l'Univers (INSU - CNRS)-Université Paris-Saclay-Centre National de la Recherche Scientifique (CNRS)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université de Versailles Saint-Quentin-en-Yvelines (UVSQ) Tongji University State Key Laboratory of Marine Geology Shanghai Istituto di Science Marine (ISMAR ) Consiglio Nazionale delle Ricerche (CNR) ANR-19-CE01-0019,MEDSENS,Sensibilité de la circulation thermohaline en Mer Méditerranée : leçons du passé pour le futur(2019) 2020-06-01 https://doi.org/10.1016/j.quascirev.2020.106306 https://hal.archives-ouvertes.fr/hal-02624107 en eng HAL CCSD Elsevier hal-02624107 doi:10.1016/j.quascirev.2020.106306 10670/1.jmlopt https://hal.archives-ouvertes.fr/hal-02624107 undefined Hyper Article en Ligne - Sciences de l'Homme et de la Société ISSN: 0277-3791 Quaternary Science Reviews Quaternary Science Reviews, Elsevier, 2020, 237, pp.106306. ⟨10.1016/j.quascirev.2020.106306⟩ envir geo Journal Article https://vocabularies.coar-repositories.org/resource_types/c_6501/ 2020 fttriple https://doi.org/10.1016/j.quascirev.2020.106306 2023-01-22T17:56:14Z International audience 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 ... Article in Journal/Newspaper North Atlantic Planktonic foraminifera Unknown Quaternary Science Reviews 237 106306 |