South Atlantic intermediate water advances into the North-east Atlantic with reduced Atlantic meridional overturning circulation during the last glacial period
International audience The Nd isotopic composition (εNd) of seawater and cold-water coral (CWC) samples from the Gulf of Cádiz and the Alboran Sea, at a depth of 280–827 m were investigated in order to constrain middepth water mass dynamics within the Gulf of Cádiz over the past 40 ka. εNd of glacia...
Published in: | Geochemistry, Geophysics, Geosystems |
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Main Authors: | , , , , , , , , , , , |
Other Authors: | , , , , , , , , , , , , , , , , , , , , , |
Format: | Article in Journal/Newspaper |
Language: | English |
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HAL CCSD
2016
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Online Access: | https://hal.science/hal-01417326 https://hal.science/hal-01417326/document https://hal.science/hal-01417326/file/2016GC006281.pdf https://doi.org/10.1002/2016GC006281 |
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ftuniversailles:oai:HAL:hal-01417326v1 |
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Open Polar |
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Université de Versailles Saint-Quentin-en-Yvelines: HAL-UVSQ |
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ftuniversailles |
language |
English |
topic |
Panoply [SDU]Sciences of the Universe [physics] |
spellingShingle |
Panoply [SDU]Sciences of the Universe [physics] Dubois-Dauphin, Q. Bonneau, Lucile Colin, Christophe Montero Serrano, J.C Montagna, P. Blamart, D. Hebbeln, D. van Rooij, D. Pons-Branchu, E. Hemsing, F. Wefing, A.M. Frank, Norbert South Atlantic intermediate water advances into the North-east Atlantic with reduced Atlantic meridional overturning circulation during the last glacial period |
topic_facet |
Panoply [SDU]Sciences of the Universe [physics] |
description |
International audience The Nd isotopic composition (εNd) of seawater and cold-water coral (CWC) samples from the Gulf of Cádiz and the Alboran Sea, at a depth of 280–827 m were investigated in order to constrain middepth water mass dynamics within the Gulf of Cádiz over the past 40 ka. εNd of glacial and Holocene CWC from the Alboran Sea and the northern Gulf of Cádiz reveals relatively constant values (−8.6 to −9.0 and −9.5 to −10.4, respectively). Such values are similar to those of the surrounding present-day middepth waters from the Mediterranean Outflow Water (MOW; εNd ∼ −9.4) and Mediterranean Sea Water (MSW; εNd ∼ −9.9). In contrast, glacial εNd values for CWC collected at thermocline depth (550–827 m) in the southern Gulf of Cádiz display a higher average value (−8.9 ± 0.4) compared to the present-day value (−11.7 ± 0.3). This implies a higher relative contribution of water masses of Mediterranean (MSW) or South Atlantic origin (East Antarctic Intermediate Water, EAAIW). Our study has produced the first evidence of significant radiogenic εNd values (∼ −8) at 19, 23–24, and 27 ka, which are coeval with increasing iceberg discharges and a weakening of Atlantic Meridional Overturning Circulation (AMOC). Since MOW εNd values remained stable during the last glacial period, it is suggested that these radiogenic εNd values most likely reflect an enhanced northward propagation of glacial EAAIW into the eastern Atlantic Basin. |
author2 |
Géosciences Paris Sud (GEOPS) Université Paris-Sud - Paris 11 (UP11)-Centre National de la Recherche Scientifique (CNRS) Institut des Sciences de la Terre de Paris (iSTeP) Université Pierre et Marie Curie - Paris 6 (UPMC)-Centre National de la Recherche Scientifique (CNRS) Géosystèmes - UMR 8217 Université de Lille, Sciences et Technologies-Centre National de la Recherche Scientifique (CNRS) Istituto di Scienze Marine Bologna (ISMAR) Istituto di Science Marine (ISMAR ) National Research Council of Italy 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)) Center for Marine Environmental Sciences Bremen (MARUM) Universität Bremen RCMG Ghent Universiteit Gent = Ghent University (UGENT) Géochrononologie Traceurs Archéométrie (GEOTRAC) Institute of Environmental Physics Heidelberg (IUP) Universität Heidelberg Heidelberg = Heidelberg University ANR-10-LABX-0018,L-IPSL,LabEx Institut Pierre Simon Laplace (IPSL): Understand climate and anticipate future changes(2010) |
format |
Article in Journal/Newspaper |
author |
Dubois-Dauphin, Q. Bonneau, Lucile Colin, Christophe Montero Serrano, J.C Montagna, P. Blamart, D. Hebbeln, D. van Rooij, D. Pons-Branchu, E. Hemsing, F. Wefing, A.M. Frank, Norbert |
author_facet |
Dubois-Dauphin, Q. Bonneau, Lucile Colin, Christophe Montero Serrano, J.C Montagna, P. Blamart, D. Hebbeln, D. van Rooij, D. Pons-Branchu, E. Hemsing, F. Wefing, A.M. Frank, Norbert |
author_sort |
Dubois-Dauphin, Q. |
title |
South Atlantic intermediate water advances into the North-east Atlantic with reduced Atlantic meridional overturning circulation during the last glacial period |
title_short |
South Atlantic intermediate water advances into the North-east Atlantic with reduced Atlantic meridional overturning circulation during the last glacial period |
title_full |
South Atlantic intermediate water advances into the North-east Atlantic with reduced Atlantic meridional overturning circulation during the last glacial period |
title_fullStr |
South Atlantic intermediate water advances into the North-east Atlantic with reduced Atlantic meridional overturning circulation during the last glacial period |
title_full_unstemmed |
South Atlantic intermediate water advances into the North-east Atlantic with reduced Atlantic meridional overturning circulation during the last glacial period |
title_sort |
south atlantic intermediate water advances into the north-east atlantic with reduced atlantic meridional overturning circulation during the last glacial period |
publisher |
HAL CCSD |
publishDate |
2016 |
url |
https://hal.science/hal-01417326 https://hal.science/hal-01417326/document https://hal.science/hal-01417326/file/2016GC006281.pdf https://doi.org/10.1002/2016GC006281 |
genre |
Antarc* Antarctic Iceberg* North East Atlantic |
genre_facet |
Antarc* Antarctic Iceberg* North East Atlantic |
op_source |
ISSN: 1525-2027 EISSN: 1525-2027 Geochemistry, Geophysics, Geosystems https://hal.science/hal-01417326 Geochemistry, Geophysics, Geosystems, 2016, 17 (6), pp.2236-2353. ⟨10.1002/2016GC006281⟩ |
op_relation |
info:eu-repo/semantics/altIdentifier/doi/10.1002/2016GC006281 hal-01417326 https://hal.science/hal-01417326 https://hal.science/hal-01417326/document https://hal.science/hal-01417326/file/2016GC006281.pdf doi:10.1002/2016GC006281 |
op_rights |
info:eu-repo/semantics/OpenAccess |
op_doi |
https://doi.org/10.1002/2016GC006281 |
container_title |
Geochemistry, Geophysics, Geosystems |
container_volume |
17 |
container_issue |
6 |
container_start_page |
2336 |
op_container_end_page |
2353 |
_version_ |
1799476181754445824 |
spelling |
ftuniversailles:oai:HAL:hal-01417326v1 2024-05-19T07:28:50+00:00 South Atlantic intermediate water advances into the North-east Atlantic with reduced Atlantic meridional overturning circulation during the last glacial period Dubois-Dauphin, Q. Bonneau, Lucile Colin, Christophe Montero Serrano, J.C Montagna, P. Blamart, D. Hebbeln, D. van Rooij, D. Pons-Branchu, E. Hemsing, F. Wefing, A.M. Frank, Norbert Géosciences Paris Sud (GEOPS) Université Paris-Sud - Paris 11 (UP11)-Centre National de la Recherche Scientifique (CNRS) Institut des Sciences de la Terre de Paris (iSTeP) Université Pierre et Marie Curie - Paris 6 (UPMC)-Centre National de la Recherche Scientifique (CNRS) Géosystèmes - UMR 8217 Université de Lille, Sciences et Technologies-Centre National de la Recherche Scientifique (CNRS) Istituto di Scienze Marine Bologna (ISMAR) Istituto di Science Marine (ISMAR ) National Research Council of Italy 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)) Center for Marine Environmental Sciences Bremen (MARUM) Universität Bremen RCMG Ghent Universiteit Gent = Ghent University (UGENT) Géochrononologie Traceurs Archéométrie (GEOTRAC) Institute of Environmental Physics Heidelberg (IUP) Universität Heidelberg Heidelberg = Heidelberg University ANR-10-LABX-0018,L-IPSL,LabEx Institut Pierre Simon Laplace (IPSL): Understand climate and anticipate future changes(2010) 2016 https://hal.science/hal-01417326 https://hal.science/hal-01417326/document https://hal.science/hal-01417326/file/2016GC006281.pdf https://doi.org/10.1002/2016GC006281 en eng HAL CCSD AGU and the Geochemical Society info:eu-repo/semantics/altIdentifier/doi/10.1002/2016GC006281 hal-01417326 https://hal.science/hal-01417326 https://hal.science/hal-01417326/document https://hal.science/hal-01417326/file/2016GC006281.pdf doi:10.1002/2016GC006281 info:eu-repo/semantics/OpenAccess ISSN: 1525-2027 EISSN: 1525-2027 Geochemistry, Geophysics, Geosystems https://hal.science/hal-01417326 Geochemistry, Geophysics, Geosystems, 2016, 17 (6), pp.2236-2353. ⟨10.1002/2016GC006281⟩ Panoply [SDU]Sciences of the Universe [physics] info:eu-repo/semantics/article Journal articles 2016 ftuniversailles https://doi.org/10.1002/2016GC006281 2024-05-02T00:02:05Z International audience The Nd isotopic composition (εNd) of seawater and cold-water coral (CWC) samples from the Gulf of Cádiz and the Alboran Sea, at a depth of 280–827 m were investigated in order to constrain middepth water mass dynamics within the Gulf of Cádiz over the past 40 ka. εNd of glacial and Holocene CWC from the Alboran Sea and the northern Gulf of Cádiz reveals relatively constant values (−8.6 to −9.0 and −9.5 to −10.4, respectively). Such values are similar to those of the surrounding present-day middepth waters from the Mediterranean Outflow Water (MOW; εNd ∼ −9.4) and Mediterranean Sea Water (MSW; εNd ∼ −9.9). In contrast, glacial εNd values for CWC collected at thermocline depth (550–827 m) in the southern Gulf of Cádiz display a higher average value (−8.9 ± 0.4) compared to the present-day value (−11.7 ± 0.3). This implies a higher relative contribution of water masses of Mediterranean (MSW) or South Atlantic origin (East Antarctic Intermediate Water, EAAIW). Our study has produced the first evidence of significant radiogenic εNd values (∼ −8) at 19, 23–24, and 27 ka, which are coeval with increasing iceberg discharges and a weakening of Atlantic Meridional Overturning Circulation (AMOC). Since MOW εNd values remained stable during the last glacial period, it is suggested that these radiogenic εNd values most likely reflect an enhanced northward propagation of glacial EAAIW into the eastern Atlantic Basin. Article in Journal/Newspaper Antarc* Antarctic Iceberg* North East Atlantic Université de Versailles Saint-Quentin-en-Yvelines: HAL-UVSQ Geochemistry, Geophysics, Geosystems 17 6 2336 2353 |