Circulation changes in the eastern Mediterranean Sea over the past 23,000 years inferred from authigenic Nd isotopic ratios
International audience The Eastern Mediterranean Sea (EMS) is a key region to study circulation change because of its own thermohaline circulation. In this study, we focused on intermediate/deep water circulation since the Last Glacial Maximum (LGM) including the sapropel S1 period. Two cores from t...
Published in: | Paleoceanography and Paleoclimatology |
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Main Authors: | , , , , , , , |
Other Authors: | , , , , , , , , , , , |
Format: | Article in Journal/Newspaper |
Language: | English |
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HAL CCSD
2018
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Online Access: | https://hal.science/hal-01713452 https://hal.science/hal-01713452/document https://hal.science/hal-01713452/file/Cornuault18P2%20copy.pdf https://doi.org/10.1002/2017PA003227 |
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HAL Université Côte d'Azur |
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English |
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[SDU.STU.OC]Sciences of the Universe [physics]/Earth Sciences/Oceanography [SDU.STU.GC]Sciences of the Universe [physics]/Earth Sciences/Geochemistry |
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[SDU.STU.OC]Sciences of the Universe [physics]/Earth Sciences/Oceanography [SDU.STU.GC]Sciences of the Universe [physics]/Earth Sciences/Geochemistry Cornuault, Marine Kazuyo, Tachikawa Vidal, Laurence Guihou, Abel Siani, Giuseppe Deschamps, Pierre Bassinot, Franck Revel, Marie Circulation changes in the eastern Mediterranean Sea over the past 23,000 years inferred from authigenic Nd isotopic ratios |
topic_facet |
[SDU.STU.OC]Sciences of the Universe [physics]/Earth Sciences/Oceanography [SDU.STU.GC]Sciences of the Universe [physics]/Earth Sciences/Geochemistry |
description |
International audience The Eastern Mediterranean Sea (EMS) is a key region to study circulation change because of its own thermohaline circulation. In this study, we focused on intermediate/deep water circulation since the Last Glacial Maximum (LGM) including the sapropel S1 period. Two cores from the Levantine Sea and the Strait of Sicily, respectively, collected at 1,780 m and 771 m water depth, were studied using 143Nd/144Nd (εNd) of foraminiferal tests and leachates as well as benthic foraminiferal stable isotopes (δ13C, δ18O). This approach allowed the determination of variations in (1) the North Atlantic water contribution to the Mediterranean basin, (2) water exchanges at the Strait of Sicily, and (3) the influence of the Nile River over the last 23,000 years. During the LGM, high benthic foraminiferal δ13C values indicate well‐ventilated intermediate and deep waters in the EMS. The εNd values were more radiogenic than at present, reflecting a smaller contribution of unradiogenic North Atlantic waters to the EMS due to reduced exchange at the Strait of Sicily. The sluggish circulation in the EMS initiated during deglaciation was further enhanced by increased Nile River freshwater inputs between 15 ka BP and the S1 period. Partial dissolution of Nile River particles contributed to an increase in EMS εNd. The large εNd gradient between the EMS and the Western Mediterranean Sea observed during LGM and S1 suggests that each basin had a distinct circulation mode. Decreasing εNd values at the Strait of Sicily after S1 reflected improved water exchange between both basins, leading to the modern circulation pattern. |
author2 |
Centre européen de recherche et d'enseignement des géosciences de l'environnement (CEREGE) Institut de Recherche pour le Développement (IRD)-Institut National de la Recherche Agronomique (INRA)-Aix Marseille Université (AMU)-Collège de France (CdF (institution))-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS) Géosciences Paris Sud (GEOPS) Université Paris-Sud - Paris 11 (UP11)-Centre National de la Recherche Scientifique (CNRS) Laboratoire des Sciences du Climat et de l'Environnement Gif-sur-Yvette (LSCE) 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)-Direction de Recherche Fondamentale (CEA) (DRF (CEA)) Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA) Paléocéanographie (PALEOCEAN) Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-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)-Direction de Recherche Fondamentale (CEA) (DRF (CEA)) Géoazur (GEOAZUR 7329) Institut national des sciences de l'Univers (INSU - CNRS)-Observatoire de la Côte d'Azur Université Côte d'Azur (UniCA)-Université Côte d'Azur (UniCA)-Centre National de la Recherche Scientifique (CNRS)-Institut de Recherche pour le Développement (IRD France-Sud ) |
format |
Article in Journal/Newspaper |
author |
Cornuault, Marine Kazuyo, Tachikawa Vidal, Laurence Guihou, Abel Siani, Giuseppe Deschamps, Pierre Bassinot, Franck Revel, Marie |
author_facet |
Cornuault, Marine Kazuyo, Tachikawa Vidal, Laurence Guihou, Abel Siani, Giuseppe Deschamps, Pierre Bassinot, Franck Revel, Marie |
author_sort |
Cornuault, Marine |
title |
Circulation changes in the eastern Mediterranean Sea over the past 23,000 years inferred from authigenic Nd isotopic ratios |
title_short |
Circulation changes in the eastern Mediterranean Sea over the past 23,000 years inferred from authigenic Nd isotopic ratios |
title_full |
Circulation changes in the eastern Mediterranean Sea over the past 23,000 years inferred from authigenic Nd isotopic ratios |
title_fullStr |
Circulation changes in the eastern Mediterranean Sea over the past 23,000 years inferred from authigenic Nd isotopic ratios |
title_full_unstemmed |
Circulation changes in the eastern Mediterranean Sea over the past 23,000 years inferred from authigenic Nd isotopic ratios |
title_sort |
circulation changes in the eastern mediterranean sea over the past 23,000 years inferred from authigenic nd isotopic ratios |
publisher |
HAL CCSD |
publishDate |
2018 |
url |
https://hal.science/hal-01713452 https://hal.science/hal-01713452/document https://hal.science/hal-01713452/file/Cornuault18P2%20copy.pdf https://doi.org/10.1002/2017PA003227 |
genre |
North Atlantic |
genre_facet |
North Atlantic |
op_source |
ISSN: 0883-8305 Paleoceanography https://hal.science/hal-01713452 Paleoceanography, 2018, 33 (3), ⟨10.1002/2017PA003227⟩ |
op_relation |
info:eu-repo/semantics/altIdentifier/doi/10.1002/2017PA003227 hal-01713452 https://hal.science/hal-01713452 https://hal.science/hal-01713452/document https://hal.science/hal-01713452/file/Cornuault18P2%20copy.pdf doi:10.1002/2017PA003227 |
op_rights |
info:eu-repo/semantics/OpenAccess |
op_doi |
https://doi.org/10.1002/2017PA003227 |
container_title |
Paleoceanography and Paleoclimatology |
container_volume |
33 |
container_issue |
3 |
container_start_page |
264 |
op_container_end_page |
280 |
_version_ |
1802647454975262720 |
spelling |
ftunivcotedazur:oai:HAL:hal-01713452v1 2024-06-23T07:55:03+00:00 Circulation changes in the eastern Mediterranean Sea over the past 23,000 years inferred from authigenic Nd isotopic ratios Cornuault, Marine Kazuyo, Tachikawa Vidal, Laurence Guihou, Abel Siani, Giuseppe Deschamps, Pierre Bassinot, Franck Revel, Marie Centre européen de recherche et d'enseignement des géosciences de l'environnement (CEREGE) Institut de Recherche pour le Développement (IRD)-Institut National de la Recherche Agronomique (INRA)-Aix Marseille Université (AMU)-Collège de France (CdF (institution))-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS) Géosciences Paris Sud (GEOPS) Université Paris-Sud - Paris 11 (UP11)-Centre National de la Recherche Scientifique (CNRS) Laboratoire des Sciences du Climat et de l'Environnement Gif-sur-Yvette (LSCE) 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)-Direction de Recherche Fondamentale (CEA) (DRF (CEA)) Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA) Paléocéanographie (PALEOCEAN) Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-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)-Direction de Recherche Fondamentale (CEA) (DRF (CEA)) Géoazur (GEOAZUR 7329) Institut national des sciences de l'Univers (INSU - CNRS)-Observatoire de la Côte d'Azur Université Côte d'Azur (UniCA)-Université Côte d'Azur (UniCA)-Centre National de la Recherche Scientifique (CNRS)-Institut de Recherche pour le Développement (IRD France-Sud ) 2018-02 https://hal.science/hal-01713452 https://hal.science/hal-01713452/document https://hal.science/hal-01713452/file/Cornuault18P2%20copy.pdf https://doi.org/10.1002/2017PA003227 en eng HAL CCSD American Geophysical Union info:eu-repo/semantics/altIdentifier/doi/10.1002/2017PA003227 hal-01713452 https://hal.science/hal-01713452 https://hal.science/hal-01713452/document https://hal.science/hal-01713452/file/Cornuault18P2%20copy.pdf doi:10.1002/2017PA003227 info:eu-repo/semantics/OpenAccess ISSN: 0883-8305 Paleoceanography https://hal.science/hal-01713452 Paleoceanography, 2018, 33 (3), ⟨10.1002/2017PA003227⟩ [SDU.STU.OC]Sciences of the Universe [physics]/Earth Sciences/Oceanography [SDU.STU.GC]Sciences of the Universe [physics]/Earth Sciences/Geochemistry info:eu-repo/semantics/article Journal articles 2018 ftunivcotedazur https://doi.org/10.1002/2017PA003227 2024-05-27T14:29:30Z International audience The Eastern Mediterranean Sea (EMS) is a key region to study circulation change because of its own thermohaline circulation. In this study, we focused on intermediate/deep water circulation since the Last Glacial Maximum (LGM) including the sapropel S1 period. Two cores from the Levantine Sea and the Strait of Sicily, respectively, collected at 1,780 m and 771 m water depth, were studied using 143Nd/144Nd (εNd) of foraminiferal tests and leachates as well as benthic foraminiferal stable isotopes (δ13C, δ18O). This approach allowed the determination of variations in (1) the North Atlantic water contribution to the Mediterranean basin, (2) water exchanges at the Strait of Sicily, and (3) the influence of the Nile River over the last 23,000 years. During the LGM, high benthic foraminiferal δ13C values indicate well‐ventilated intermediate and deep waters in the EMS. The εNd values were more radiogenic than at present, reflecting a smaller contribution of unradiogenic North Atlantic waters to the EMS due to reduced exchange at the Strait of Sicily. The sluggish circulation in the EMS initiated during deglaciation was further enhanced by increased Nile River freshwater inputs between 15 ka BP and the S1 period. Partial dissolution of Nile River particles contributed to an increase in EMS εNd. The large εNd gradient between the EMS and the Western Mediterranean Sea observed during LGM and S1 suggests that each basin had a distinct circulation mode. Decreasing εNd values at the Strait of Sicily after S1 reflected improved water exchange between both basins, leading to the modern circulation pattern. Article in Journal/Newspaper North Atlantic HAL Université Côte d'Azur Paleoceanography and Paleoclimatology 33 3 264 280 |