Changes in northeast Atlantic hydrology during Termination 1: Insights from Celtic margin's benthic foraminifera
International audience Using benthic foraminiferal-based proxies in sediments from the Celtic margin, we provide a well-dated record across the last deglaciation of the Channel River dynamics and its potential impact on the hydrology of intermediate water masses along the European margin. Our result...
Published in: | Quaternary Science Reviews |
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Main Authors: | , , , , , , , |
Other Authors: | , , , , , , , , , , |
Format: | Article in Journal/Newspaper |
Language: | English |
Published: |
HAL CCSD
2017
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Subjects: | |
Online Access: | https://hal.univ-angers.fr/hal-02872442 https://doi.org/10.1016/j.quascirev.2017.09.003 |
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ftccsdartic:oai:HAL:hal-02872442v1 |
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institution |
Open Polar |
collection |
Archive ouverte HAL (Hyper Article en Ligne, CCSD - Centre pour la Communication Scientifique Directe) |
op_collection_id |
ftccsdartic |
language |
English |
topic |
Stable isotopes Quaternary AMOC Channel River Deglaciation Elemental ratios Foraminiferal assemblages Micropaleontology North Atlantic Paleoceanography [SDU]Sciences of the Universe [physics] |
spellingShingle |
Stable isotopes Quaternary AMOC Channel River Deglaciation Elemental ratios Foraminiferal assemblages Micropaleontology North Atlantic Paleoceanography [SDU]Sciences of the Universe [physics] Mojtahid, Meryem Toucanne, Samuel Fentimen, R. Barras, Christine Le Houedec, S. Soulet, G. Bourillet, J.-F. Michel, Elisabeth Changes in northeast Atlantic hydrology during Termination 1: Insights from Celtic margin's benthic foraminifera |
topic_facet |
Stable isotopes Quaternary AMOC Channel River Deglaciation Elemental ratios Foraminiferal assemblages Micropaleontology North Atlantic Paleoceanography [SDU]Sciences of the Universe [physics] |
description |
International audience Using benthic foraminiferal-based proxies in sediments from the Celtic margin, we provide a well-dated record across the last deglaciation of the Channel River dynamics and its potential impact on the hydrology of intermediate water masses along the European margin. Our results describe three main periods: 1) During the Last Glacial Maximum, and before ∼21 ka BP, the predominance of meso-oligotrophic species suggests well oxygenated water masses. After ∼21 ka BP, increasing proportions of eutrophic species related to enhanced riverine supply occurs concomitantly with early warming in Greenland air-temperatures; 2) A thick laminated deposit, occurring during a 1500-years long period of seasonal melting of the European Ice Sheet (EIS), is associated with early Heinrich Stadial 1 period (∼18.2–16.7 ka BP). The benthic proxies describe low salinity episodes, cold temperatures, severe dysoxia and eutrophic conditions on the sea floor, perhaps evidence for cascading of turbid meltwaters; 3) During late HS1 (∼16.7–14.7 ka BP), conditions on the Celtic margin's seafloor changed drastically and faunas indicate oligotrophic conditions as a result of the ceasing of EIS meltwater discharges. While surface waters were cold due to Laurentide Ice Sheet (LIS) icebergs releases, increasing benthic Mg/Ca ratios reveal a progressive warming of intermediate water masses whereas oxygen proxies indicate overall well oxygenated conditions. In addition to the well known effect of EIS meltwaters on surface waters in the Celtic margin, our benthic record documents a pronounced impact on intermediate water depths during HS1, which coincided with major AMOC disruptions. |
author2 |
Laboratoire de Planétologie et Géodynamique - Angers (LPG-ANGERS) Laboratoire de Planétologie et Géodynamique UMR 6112 (LPG) Université d'Angers (UA)-Université de Nantes - UFR des Sciences et des Techniques (UN UFR ST) Université de Nantes (UN)-Université de Nantes (UN)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS)-Université d'Angers (UA)-Université de Nantes - UFR des Sciences et des Techniques (UN UFR ST) Université de Nantes (UN)-Université de Nantes (UN)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS) Department of Geography at Durham University Durham University 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) Paléocéanographie (PALEOCEAN) 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) |
format |
Article in Journal/Newspaper |
author |
Mojtahid, Meryem Toucanne, Samuel Fentimen, R. Barras, Christine Le Houedec, S. Soulet, G. Bourillet, J.-F. Michel, Elisabeth |
author_facet |
Mojtahid, Meryem Toucanne, Samuel Fentimen, R. Barras, Christine Le Houedec, S. Soulet, G. Bourillet, J.-F. Michel, Elisabeth |
author_sort |
Mojtahid, Meryem |
title |
Changes in northeast Atlantic hydrology during Termination 1: Insights from Celtic margin's benthic foraminifera |
title_short |
Changes in northeast Atlantic hydrology during Termination 1: Insights from Celtic margin's benthic foraminifera |
title_full |
Changes in northeast Atlantic hydrology during Termination 1: Insights from Celtic margin's benthic foraminifera |
title_fullStr |
Changes in northeast Atlantic hydrology during Termination 1: Insights from Celtic margin's benthic foraminifera |
title_full_unstemmed |
Changes in northeast Atlantic hydrology during Termination 1: Insights from Celtic margin's benthic foraminifera |
title_sort |
changes in northeast atlantic hydrology during termination 1: insights from celtic margin's benthic foraminifera |
publisher |
HAL CCSD |
publishDate |
2017 |
url |
https://hal.univ-angers.fr/hal-02872442 https://doi.org/10.1016/j.quascirev.2017.09.003 |
geographic |
Greenland |
geographic_facet |
Greenland |
genre |
Greenland Ice Sheet North Atlantic Northeast Atlantic |
genre_facet |
Greenland Ice Sheet North Atlantic Northeast Atlantic |
op_source |
ISSN: 0277-3791 Quaternary Science Reviews https://hal.univ-angers.fr/hal-02872442 Quaternary Science Reviews, Elsevier, 2017, 175, pp.45-59. ⟨10.1016/j.quascirev.2017.09.003⟩ http://www.sciencedirect.com/science/article/pii/S0277379117304705 |
op_relation |
info:eu-repo/semantics/altIdentifier/doi/10.1016/j.quascirev.2017.09.003 hal-02872442 https://hal.univ-angers.fr/hal-02872442 doi:10.1016/j.quascirev.2017.09.003 OKINA: ua16254 |
op_doi |
https://doi.org/10.1016/j.quascirev.2017.09.003 |
container_title |
Quaternary Science Reviews |
container_volume |
175 |
container_start_page |
45 |
op_container_end_page |
59 |
_version_ |
1766019768742051840 |
spelling |
ftccsdartic:oai:HAL:hal-02872442v1 2023-05-15T16:30:03+02:00 Changes in northeast Atlantic hydrology during Termination 1: Insights from Celtic margin's benthic foraminifera Mojtahid, Meryem Toucanne, Samuel Fentimen, R. Barras, Christine Le Houedec, S. Soulet, G. Bourillet, J.-F. Michel, Elisabeth Laboratoire de Planétologie et Géodynamique - Angers (LPG-ANGERS) Laboratoire de Planétologie et Géodynamique UMR 6112 (LPG) Université d'Angers (UA)-Université de Nantes - UFR des Sciences et des Techniques (UN UFR ST) Université de Nantes (UN)-Université de Nantes (UN)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS)-Université d'Angers (UA)-Université de Nantes - UFR des Sciences et des Techniques (UN UFR ST) Université de Nantes (UN)-Université de Nantes (UN)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS) Department of Geography at Durham University Durham University 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) Paléocéanographie (PALEOCEAN) 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) 2017 https://hal.univ-angers.fr/hal-02872442 https://doi.org/10.1016/j.quascirev.2017.09.003 en eng HAL CCSD Elsevier info:eu-repo/semantics/altIdentifier/doi/10.1016/j.quascirev.2017.09.003 hal-02872442 https://hal.univ-angers.fr/hal-02872442 doi:10.1016/j.quascirev.2017.09.003 OKINA: ua16254 ISSN: 0277-3791 Quaternary Science Reviews https://hal.univ-angers.fr/hal-02872442 Quaternary Science Reviews, Elsevier, 2017, 175, pp.45-59. ⟨10.1016/j.quascirev.2017.09.003⟩ http://www.sciencedirect.com/science/article/pii/S0277379117304705 Stable isotopes Quaternary AMOC Channel River Deglaciation Elemental ratios Foraminiferal assemblages Micropaleontology North Atlantic Paleoceanography [SDU]Sciences of the Universe [physics] info:eu-repo/semantics/article Journal articles 2017 ftccsdartic https://doi.org/10.1016/j.quascirev.2017.09.003 2021-12-19T01:04:44Z International audience Using benthic foraminiferal-based proxies in sediments from the Celtic margin, we provide a well-dated record across the last deglaciation of the Channel River dynamics and its potential impact on the hydrology of intermediate water masses along the European margin. Our results describe three main periods: 1) During the Last Glacial Maximum, and before ∼21 ka BP, the predominance of meso-oligotrophic species suggests well oxygenated water masses. After ∼21 ka BP, increasing proportions of eutrophic species related to enhanced riverine supply occurs concomitantly with early warming in Greenland air-temperatures; 2) A thick laminated deposit, occurring during a 1500-years long period of seasonal melting of the European Ice Sheet (EIS), is associated with early Heinrich Stadial 1 period (∼18.2–16.7 ka BP). The benthic proxies describe low salinity episodes, cold temperatures, severe dysoxia and eutrophic conditions on the sea floor, perhaps evidence for cascading of turbid meltwaters; 3) During late HS1 (∼16.7–14.7 ka BP), conditions on the Celtic margin's seafloor changed drastically and faunas indicate oligotrophic conditions as a result of the ceasing of EIS meltwater discharges. While surface waters were cold due to Laurentide Ice Sheet (LIS) icebergs releases, increasing benthic Mg/Ca ratios reveal a progressive warming of intermediate water masses whereas oxygen proxies indicate overall well oxygenated conditions. In addition to the well known effect of EIS meltwaters on surface waters in the Celtic margin, our benthic record documents a pronounced impact on intermediate water depths during HS1, which coincided with major AMOC disruptions. Article in Journal/Newspaper Greenland Ice Sheet North Atlantic Northeast Atlantic Archive ouverte HAL (Hyper Article en Ligne, CCSD - Centre pour la Communication Scientifique Directe) Greenland Quaternary Science Reviews 175 45 59 |