Millennial-scale Holocene hydrological changes in the northeast Atlantic: New insights from ‘La Grande Vasière’ mid-shelf mud belt
International audience A mid- to late-Holocene paleohydrological reconstruction from the northeast Atlantic is proposed through the study of a high-resolution sedimentary record from the northern continental shelf of the Bay of Biscay (BoB). Three foraminiferal species dominate the assemblages with...
Published in: | The Holocene |
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Main Authors: | , , , , , , , |
Other Authors: | , , , , , , , , , , , , , |
Format: | Article in Journal/Newspaper |
Language: | English |
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HAL CCSD
2019
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Subjects: | |
Online Access: | https://univ-angers.hal.science/hal-02872808 https://doi.org/10.1177/0959683618816478 |
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Portail des publications scientifiques de l’Université d’Angers (HAL) |
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language |
English |
topic |
AMOC Bay of Biscay benthic foraminifera NAO-like process river runoff Stable isotopes [SDU]Sciences of the Universe [physics] |
spellingShingle |
AMOC Bay of Biscay benthic foraminifera NAO-like process river runoff Stable isotopes [SDU]Sciences of the Universe [physics] Mojtahid, Meryem Durand, Matthieu Coste, Pierre-Olivier Toucanne, Samuel Howa, Hélène Nizou, Jean Eynaud, Frédérique Pénaud, Aurélie Millennial-scale Holocene hydrological changes in the northeast Atlantic: New insights from ‘La Grande Vasière’ mid-shelf mud belt |
topic_facet |
AMOC Bay of Biscay benthic foraminifera NAO-like process river runoff Stable isotopes [SDU]Sciences of the Universe [physics] |
description |
International audience A mid- to late-Holocene paleohydrological reconstruction from the northeast Atlantic is proposed through the study of a high-resolution sedimentary record from the northern continental shelf of the Bay of Biscay (BoB). Three foraminiferal species dominate the assemblages with Rosalina globularis showing an overall decrease in absolute and relative abundances from ~7 to 0.4 cal. ka BP, whereas the opposite trend is observed for Cibicides refulgens and Lobatula. These long-term patterns are interpreted as a response to the overall cooling trend and/or the progressive deepening of the water column because of the relative sea-level (RSL) rise. Foraminiferal δ18O and grain-size analyses show a significant shift around 3.5–2.5 cal. ka BP toward a heavier isotopic signature and finer sediments. We mainly link this change to enhanced contribution of continental freshwaters and fine sediments after the near-stabilization of the RSL rise. By reducing coastal accommodation spaces, this led to a better channelization of river outflows and probably to the formation of the modern winter thermohaline front. Superimposed on these long-term patterns, our data highlight strong millennial-scale variability (1250-year peak). Such cyclicity is consistent with several records tracing changes in rainfall and storminess regimes in northern Europe, and the dynamics of the subpolar gyre (SPG). We suggest a millennial time-scale control of a NAO-like (North Atlantic Oscillation) climatic process modulating continental humidity (and the associated river discharges) and SPG dynamics through wind stress. Spectral analyses reveal an additional 500-year frequency peak implying a possible solar forcing. |
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) Laboratoire Géosciences Océan (LGO) Université de Bretagne Sud (UBS)-Institut Français de Recherche pour l'Exploitation de la Mer (IFREMER)-Université de Brest (UBO)-Centre National de la Recherche Scientifique (CNRS) Unité Géosciences Marines (GM) Institut Français de Recherche pour l'Exploitation de la Mer (IFREMER) Environnements et Paléoenvironnements OCéaniques (EPOC) Observatoire aquitain des sciences de l'univers (OASU) Université Sciences et Technologies - Bordeaux 1 (UB)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS)-Université Sciences et Technologies - Bordeaux 1 (UB)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS)-École Pratique des Hautes Études (EPHE) Université Paris Sciences et Lettres (PSL)-Université Paris Sciences et Lettres (PSL)-Centre National de la Recherche Scientifique (CNRS) ANR-17-EURE-0015,ISBlue,Interdisciplinary Graduate School for the Blue planet(2017) |
format |
Article in Journal/Newspaper |
author |
Mojtahid, Meryem Durand, Matthieu Coste, Pierre-Olivier Toucanne, Samuel Howa, Hélène Nizou, Jean Eynaud, Frédérique Pénaud, Aurélie |
author_facet |
Mojtahid, Meryem Durand, Matthieu Coste, Pierre-Olivier Toucanne, Samuel Howa, Hélène Nizou, Jean Eynaud, Frédérique Pénaud, Aurélie |
author_sort |
Mojtahid, Meryem |
title |
Millennial-scale Holocene hydrological changes in the northeast Atlantic: New insights from ‘La Grande Vasière’ mid-shelf mud belt |
title_short |
Millennial-scale Holocene hydrological changes in the northeast Atlantic: New insights from ‘La Grande Vasière’ mid-shelf mud belt |
title_full |
Millennial-scale Holocene hydrological changes in the northeast Atlantic: New insights from ‘La Grande Vasière’ mid-shelf mud belt |
title_fullStr |
Millennial-scale Holocene hydrological changes in the northeast Atlantic: New insights from ‘La Grande Vasière’ mid-shelf mud belt |
title_full_unstemmed |
Millennial-scale Holocene hydrological changes in the northeast Atlantic: New insights from ‘La Grande Vasière’ mid-shelf mud belt |
title_sort |
millennial-scale holocene hydrological changes in the northeast atlantic: new insights from ‘la grande vasière’ mid-shelf mud belt |
publisher |
HAL CCSD |
publishDate |
2019 |
url |
https://univ-angers.hal.science/hal-02872808 https://doi.org/10.1177/0959683618816478 |
genre |
North Atlantic North Atlantic oscillation Northeast Atlantic |
genre_facet |
North Atlantic North Atlantic oscillation Northeast Atlantic |
op_source |
ISSN: 0959-6836 EISSN: 1477-0911 The Holocene https://univ-angers.hal.science/hal-02872808 The Holocene, 2019, 29 (3), pp.467-480. ⟨10.1177/0959683618816478⟩ https://journals.sagepub.com/doi/abs/10.1177/0959683618816478?journalCode=hola |
op_relation |
info:eu-repo/semantics/altIdentifier/doi/10.1177/0959683618816478 hal-02872808 https://univ-angers.hal.science/hal-02872808 doi:10.1177/0959683618816478 OKINA: ua17602 |
op_doi |
https://doi.org/10.1177/0959683618816478 |
container_title |
The Holocene |
container_volume |
29 |
container_issue |
3 |
container_start_page |
467 |
op_container_end_page |
480 |
_version_ |
1799485369456001024 |
spelling |
ftunivangershal:oai:HAL:hal-02872808v1 2024-05-19T07:45:21+00:00 Millennial-scale Holocene hydrological changes in the northeast Atlantic: New insights from ‘La Grande Vasière’ mid-shelf mud belt Mojtahid, Meryem Durand, Matthieu Coste, Pierre-Olivier Toucanne, Samuel Howa, Hélène Nizou, Jean Eynaud, Frédérique Pénaud, Aurélie 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) Laboratoire Géosciences Océan (LGO) Université de Bretagne Sud (UBS)-Institut Français de Recherche pour l'Exploitation de la Mer (IFREMER)-Université de Brest (UBO)-Centre National de la Recherche Scientifique (CNRS) Unité Géosciences Marines (GM) Institut Français de Recherche pour l'Exploitation de la Mer (IFREMER) Environnements et Paléoenvironnements OCéaniques (EPOC) Observatoire aquitain des sciences de l'univers (OASU) Université Sciences et Technologies - Bordeaux 1 (UB)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS)-Université Sciences et Technologies - Bordeaux 1 (UB)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS)-École Pratique des Hautes Études (EPHE) Université Paris Sciences et Lettres (PSL)-Université Paris Sciences et Lettres (PSL)-Centre National de la Recherche Scientifique (CNRS) ANR-17-EURE-0015,ISBlue,Interdisciplinary Graduate School for the Blue planet(2017) 2019 https://univ-angers.hal.science/hal-02872808 https://doi.org/10.1177/0959683618816478 en eng HAL CCSD London: Sage info:eu-repo/semantics/altIdentifier/doi/10.1177/0959683618816478 hal-02872808 https://univ-angers.hal.science/hal-02872808 doi:10.1177/0959683618816478 OKINA: ua17602 ISSN: 0959-6836 EISSN: 1477-0911 The Holocene https://univ-angers.hal.science/hal-02872808 The Holocene, 2019, 29 (3), pp.467-480. ⟨10.1177/0959683618816478⟩ https://journals.sagepub.com/doi/abs/10.1177/0959683618816478?journalCode=hola AMOC Bay of Biscay benthic foraminifera NAO-like process river runoff Stable isotopes [SDU]Sciences of the Universe [physics] info:eu-repo/semantics/article Journal articles 2019 ftunivangershal https://doi.org/10.1177/0959683618816478 2024-04-26T01:44:06Z International audience A mid- to late-Holocene paleohydrological reconstruction from the northeast Atlantic is proposed through the study of a high-resolution sedimentary record from the northern continental shelf of the Bay of Biscay (BoB). Three foraminiferal species dominate the assemblages with Rosalina globularis showing an overall decrease in absolute and relative abundances from ~7 to 0.4 cal. ka BP, whereas the opposite trend is observed for Cibicides refulgens and Lobatula. These long-term patterns are interpreted as a response to the overall cooling trend and/or the progressive deepening of the water column because of the relative sea-level (RSL) rise. Foraminiferal δ18O and grain-size analyses show a significant shift around 3.5–2.5 cal. ka BP toward a heavier isotopic signature and finer sediments. We mainly link this change to enhanced contribution of continental freshwaters and fine sediments after the near-stabilization of the RSL rise. By reducing coastal accommodation spaces, this led to a better channelization of river outflows and probably to the formation of the modern winter thermohaline front. Superimposed on these long-term patterns, our data highlight strong millennial-scale variability (1250-year peak). Such cyclicity is consistent with several records tracing changes in rainfall and storminess regimes in northern Europe, and the dynamics of the subpolar gyre (SPG). We suggest a millennial time-scale control of a NAO-like (North Atlantic Oscillation) climatic process modulating continental humidity (and the associated river discharges) and SPG dynamics through wind stress. Spectral analyses reveal an additional 500-year frequency peak implying a possible solar forcing. Article in Journal/Newspaper North Atlantic North Atlantic oscillation Northeast Atlantic Portail des publications scientifiques de l’Université d’Angers (HAL) The Holocene 29 3 467 480 |