Stratification of surface waters during the last glacial millennial climatic events: a key factor in subsurface and deep-water mass dynamics
International audience The last glacial period was punctuated by abrupt climatic events with extrema known as Heinrich and Dansgaard–Oeschger events. These millennial events have been the subject of many paleoreconstructions and model experiments in the past decades, but yet the hydrological process...
Published in: | Climate of the Past |
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Main Authors: | , , , , , , , , , , , |
Other Authors: | , , , , , , , , , , , , |
Format: | Article in Journal/Newspaper |
Language: | English |
Published: |
HAL CCSD
2015
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Subjects: | |
Online Access: | https://hal.archives-ouvertes.fr/hal-01453043 https://hal.archives-ouvertes.fr/hal-01453043/document https://hal.archives-ouvertes.fr/hal-01453043/file/cp-11-1507-2015.pdf https://doi.org/10.5194/cp-11-1507-2015 |
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Archive ouverte HAL (Hyper Article en Ligne, CCSD - Centre pour la Communication Scientifique Directe) |
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English |
topic |
[SDV]Life Sciences [q-bio] |
spellingShingle |
[SDV]Life Sciences [q-bio] Wary, M. Eynaud, Frédérique Sabine, M. Zaragosi, Sébastien Rossignol, Linda Malaizé, B. Palis, E. Zumaque, J. Caulle, Clémence Pénaud, Aurélie Michel, Elisabeth Charlier, Karine Stratification of surface waters during the last glacial millennial climatic events: a key factor in subsurface and deep-water mass dynamics |
topic_facet |
[SDV]Life Sciences [q-bio] |
description |
International audience The last glacial period was punctuated by abrupt climatic events with extrema known as Heinrich and Dansgaard–Oeschger events. These millennial events have been the subject of many paleoreconstructions and model experiments in the past decades, but yet the hydrological processes involved remain elusive. In the present work, high-resolution analyses were conducted on the 12–42 ka BP section of core MD99-2281 retrieved southwest of the Faeroe Islands, and combined with analyses conducted in two previous studies (Zumaque et al., 2012; Caulle et al., 2013). Such a multiproxy approach, coupling micropaleontological, geochemical and sedimentological analyses, allows us to track surface, subsurface, and deep hydrological processes occurring during these rapid climatic changes. Records indicate that the coldest episodes of the studied period (Greenland stadials and Heinrich stadials) were characterized by a strong stratification of surface waters. This surface stratification seems to have played a key role in the dynamics of subsurface and deep-water masses. Indeed, periods of high surface stratification are marked by a coupling of subsurface and deep circulations which sharply weaken at the beginning of stadials, while surface conditions progressively deteriorate throughout these cold episodes; conversely, periods of decreasing surface stratification (Greenland interstadials) are characterized by a coupling of surface and deep hydrological processes, with progressively milder surface conditions and gradual intensification of the deep circulation, while the vigor of the subsurface northward Atlantic flow remains constantly high. Our results also reveal different and atypical hydrological signatures during Heinrich stadials (HSs): while HS1 and HS4 exhibit a "usual" scheme with reduced overturning circulation, a relatively active North Atlantic circulation seems to have prevailed during HS2, and HS3 seems to have experienced a re-intensification of this circulation during the middle of the event. ... |
author2 |
UMR 5805 Environnements et Paléoenvironnements Océaniques et Continentaux (EPOC) Observatoire aquitain des sciences de l'univers (OASU) Université Sciences et Technologies - Bordeaux 1-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS)-Université Sciences et Technologies - Bordeaux 1-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) Université du Québec à Montréal = University of Québec in Montréal (UQAM) Institut Français de Recherche pour l'Exploitation de la Mer - Brest (IFREMER Centre de Bretagne) Institut Français de Recherche pour l'Exploitation de la Mer (IFREMER) Domaines Océaniques (LDO) Centre National de la Recherche Scientifique (CNRS)-Institut d'écologie et environnement-Observatoire des Sciences de l'Univers-Université de Brest (UBO)-Institut national des sciences de l'Univers (INSU - CNRS) 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 |
Wary, M. Eynaud, Frédérique Sabine, M. Zaragosi, Sébastien Rossignol, Linda Malaizé, B. Palis, E. Zumaque, J. Caulle, Clémence Pénaud, Aurélie Michel, Elisabeth Charlier, Karine |
author_facet |
Wary, M. Eynaud, Frédérique Sabine, M. Zaragosi, Sébastien Rossignol, Linda Malaizé, B. Palis, E. Zumaque, J. Caulle, Clémence Pénaud, Aurélie Michel, Elisabeth Charlier, Karine |
author_sort |
Wary, M. |
title |
Stratification of surface waters during the last glacial millennial climatic events: a key factor in subsurface and deep-water mass dynamics |
title_short |
Stratification of surface waters during the last glacial millennial climatic events: a key factor in subsurface and deep-water mass dynamics |
title_full |
Stratification of surface waters during the last glacial millennial climatic events: a key factor in subsurface and deep-water mass dynamics |
title_fullStr |
Stratification of surface waters during the last glacial millennial climatic events: a key factor in subsurface and deep-water mass dynamics |
title_full_unstemmed |
Stratification of surface waters during the last glacial millennial climatic events: a key factor in subsurface and deep-water mass dynamics |
title_sort |
stratification of surface waters during the last glacial millennial climatic events: a key factor in subsurface and deep-water mass dynamics |
publisher |
HAL CCSD |
publishDate |
2015 |
url |
https://hal.archives-ouvertes.fr/hal-01453043 https://hal.archives-ouvertes.fr/hal-01453043/document https://hal.archives-ouvertes.fr/hal-01453043/file/cp-11-1507-2015.pdf https://doi.org/10.5194/cp-11-1507-2015 |
geographic |
Greenland |
geographic_facet |
Greenland |
genre |
Dansgaard-Oeschger events Greenland North Atlantic |
genre_facet |
Dansgaard-Oeschger events Greenland North Atlantic |
op_source |
ISSN: 1814-9324 EISSN: 1814-9332 Climate of the Past https://hal.archives-ouvertes.fr/hal-01453043 Climate of the Past, European Geosciences Union (EGU), 2015, 11 (11), pp.1507-1525. ⟨10.5194/cp-11-1507-2015⟩ http://www.clim-past.net/11/1507/2015/ |
op_relation |
info:eu-repo/semantics/altIdentifier/doi/10.5194/cp-11-1507-2015 hal-01453043 https://hal.archives-ouvertes.fr/hal-01453043 https://hal.archives-ouvertes.fr/hal-01453043/document https://hal.archives-ouvertes.fr/hal-01453043/file/cp-11-1507-2015.pdf doi:10.5194/cp-11-1507-2015 OKINA: ua15540 |
op_rights |
info:eu-repo/semantics/OpenAccess |
op_doi |
https://doi.org/10.5194/cp-11-1507-2015 |
container_title |
Climate of the Past |
container_volume |
11 |
container_issue |
11 |
container_start_page |
1507 |
op_container_end_page |
1525 |
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1766395964529049600 |
spelling |
ftccsdartic:oai:HAL:hal-01453043v1 2023-05-15T16:00:05+02:00 Stratification of surface waters during the last glacial millennial climatic events: a key factor in subsurface and deep-water mass dynamics Wary, M. Eynaud, Frédérique Sabine, M. Zaragosi, Sébastien Rossignol, Linda Malaizé, B. Palis, E. Zumaque, J. Caulle, Clémence Pénaud, Aurélie Michel, Elisabeth Charlier, Karine UMR 5805 Environnements et Paléoenvironnements Océaniques et Continentaux (EPOC) Observatoire aquitain des sciences de l'univers (OASU) Université Sciences et Technologies - Bordeaux 1-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS)-Université Sciences et Technologies - Bordeaux 1-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) Université du Québec à Montréal = University of Québec in Montréal (UQAM) Institut Français de Recherche pour l'Exploitation de la Mer - Brest (IFREMER Centre de Bretagne) Institut Français de Recherche pour l'Exploitation de la Mer (IFREMER) Domaines Océaniques (LDO) Centre National de la Recherche Scientifique (CNRS)-Institut d'écologie et environnement-Observatoire des Sciences de l'Univers-Université de Brest (UBO)-Institut national des sciences de l'Univers (INSU - CNRS) 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) 2015 https://hal.archives-ouvertes.fr/hal-01453043 https://hal.archives-ouvertes.fr/hal-01453043/document https://hal.archives-ouvertes.fr/hal-01453043/file/cp-11-1507-2015.pdf https://doi.org/10.5194/cp-11-1507-2015 en eng HAL CCSD European Geosciences Union (EGU) info:eu-repo/semantics/altIdentifier/doi/10.5194/cp-11-1507-2015 hal-01453043 https://hal.archives-ouvertes.fr/hal-01453043 https://hal.archives-ouvertes.fr/hal-01453043/document https://hal.archives-ouvertes.fr/hal-01453043/file/cp-11-1507-2015.pdf doi:10.5194/cp-11-1507-2015 OKINA: ua15540 info:eu-repo/semantics/OpenAccess ISSN: 1814-9324 EISSN: 1814-9332 Climate of the Past https://hal.archives-ouvertes.fr/hal-01453043 Climate of the Past, European Geosciences Union (EGU), 2015, 11 (11), pp.1507-1525. ⟨10.5194/cp-11-1507-2015⟩ http://www.clim-past.net/11/1507/2015/ [SDV]Life Sciences [q-bio] info:eu-repo/semantics/article Journal articles 2015 ftccsdartic https://doi.org/10.5194/cp-11-1507-2015 2021-12-19T00:52:11Z International audience The last glacial period was punctuated by abrupt climatic events with extrema known as Heinrich and Dansgaard–Oeschger events. These millennial events have been the subject of many paleoreconstructions and model experiments in the past decades, but yet the hydrological processes involved remain elusive. In the present work, high-resolution analyses were conducted on the 12–42 ka BP section of core MD99-2281 retrieved southwest of the Faeroe Islands, and combined with analyses conducted in two previous studies (Zumaque et al., 2012; Caulle et al., 2013). Such a multiproxy approach, coupling micropaleontological, geochemical and sedimentological analyses, allows us to track surface, subsurface, and deep hydrological processes occurring during these rapid climatic changes. Records indicate that the coldest episodes of the studied period (Greenland stadials and Heinrich stadials) were characterized by a strong stratification of surface waters. This surface stratification seems to have played a key role in the dynamics of subsurface and deep-water masses. Indeed, periods of high surface stratification are marked by a coupling of subsurface and deep circulations which sharply weaken at the beginning of stadials, while surface conditions progressively deteriorate throughout these cold episodes; conversely, periods of decreasing surface stratification (Greenland interstadials) are characterized by a coupling of surface and deep hydrological processes, with progressively milder surface conditions and gradual intensification of the deep circulation, while the vigor of the subsurface northward Atlantic flow remains constantly high. Our results also reveal different and atypical hydrological signatures during Heinrich stadials (HSs): while HS1 and HS4 exhibit a "usual" scheme with reduced overturning circulation, a relatively active North Atlantic circulation seems to have prevailed during HS2, and HS3 seems to have experienced a re-intensification of this circulation during the middle of the event. ... Article in Journal/Newspaper Dansgaard-Oeschger events Greenland North Atlantic Archive ouverte HAL (Hyper Article en Ligne, CCSD - Centre pour la Communication Scientifique Directe) Greenland Climate of the Past 11 11 1507 1525 |