South Atlantic intermediate water advances into the North-east Atlantic with reduced Atlantic meridional overturning circulation during the last glacial period
The Nd isotopic composition (epsilon Nd) of seawater and cold-water coral (CWC) samples from the Gulf of Cadiz 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 Cadiz over the past 40 ka. epsilon Nd of glacial and Hol...
Published in: | Geochemistry, Geophysics, Geosystems |
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2016
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Online Access: | https://biblio.ugent.be/publication/8078729 http://hdl.handle.net/1854/LU-8078729 https://doi.org/10.1002/2016GC006281 https://biblio.ugent.be/publication/8078729/file/8078743 |
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ftunivgent:oai:archive.ugent.be:8078729 2023-06-11T04:05:54+02:00 South Atlantic intermediate water advances into the North-east Atlantic with reduced Atlantic meridional overturning circulation during the last glacial period Dubois-Dauphin, Quentin Bonneau, Lucile Colin, Christophe Montero-Serrano, Jean-Carlos Montagna, Paolo Blamart, Dominique Hebbeln, Dierk Van Rooij, David Pons-Branchu, Edwige Hemsing, Freya Wefing, Anne-Marie Frank, Norbert 2016 application/pdf https://biblio.ugent.be/publication/8078729 http://hdl.handle.net/1854/LU-8078729 https://doi.org/10.1002/2016GC006281 https://biblio.ugent.be/publication/8078729/file/8078743 eng eng https://biblio.ugent.be/publication/8078729 http://hdl.handle.net/1854/LU-8078729 http://dx.doi.org/10.1002/2016GC006281 https://biblio.ugent.be/publication/8078729/file/8078743 No license (in copyright) info:eu-repo/semantics/openAccess GEOCHEMISTRY GEOPHYSICS GEOSYSTEMS ISSN: 1525-2027 Earth and Environmental Sciences neodymium isotopes cold-water corals Mediterranean outflow water East Antarctic intermediate water Mediterranean sea water Gulf of Cadiz DEEP-SEA CORALS NEODYMIUM ISOTOPIC COMPOSITION HIGH-RESOLUTION RECORD MID-DEPTH CIRCULATION 18 000 YEARS BP OCEAN CIRCULATION PACIFIC-OCEAN THERMOHALINE CIRCULATION SURFACE-TEMPERATURE journalArticle info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion 2016 ftunivgent https://doi.org/10.1002/2016GC006281 2023-05-10T22:32:49Z The Nd isotopic composition (epsilon Nd) of seawater and cold-water coral (CWC) samples from the Gulf of Cadiz 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 Cadiz over the past 40 ka. epsilon Nd of glacial and Holocene CWC from the Alboran Sea and the northern Gulf of Cadiz 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; epsilon Nd approximate to -9.4) and Mediterranean Sea Water (MSW; epsilon Nd approximate to -9.9). In contrast, glacial epsilon Nd values for CWC collected at thermocline depth (550-827 m) in the southern Gulf of Cadiz display a higher average value (-8.90.4) compared to the present-day value (-11.70.3). 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 epsilon Nd values (approximate to -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 epsilon Nd values remained stable during the last glacial period, it is suggested that these radiogenic epsilon Nd 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 Ghent University Academic Bibliography Antarctic Pacific Geochemistry, Geophysics, Geosystems 17 6 2336 2353 |
institution |
Open Polar |
collection |
Ghent University Academic Bibliography |
op_collection_id |
ftunivgent |
language |
English |
topic |
Earth and Environmental Sciences neodymium isotopes cold-water corals Mediterranean outflow water East Antarctic intermediate water Mediterranean sea water Gulf of Cadiz DEEP-SEA CORALS NEODYMIUM ISOTOPIC COMPOSITION HIGH-RESOLUTION RECORD MID-DEPTH CIRCULATION 18 000 YEARS BP OCEAN CIRCULATION PACIFIC-OCEAN THERMOHALINE CIRCULATION SURFACE-TEMPERATURE |
spellingShingle |
Earth and Environmental Sciences neodymium isotopes cold-water corals Mediterranean outflow water East Antarctic intermediate water Mediterranean sea water Gulf of Cadiz DEEP-SEA CORALS NEODYMIUM ISOTOPIC COMPOSITION HIGH-RESOLUTION RECORD MID-DEPTH CIRCULATION 18 000 YEARS BP OCEAN CIRCULATION PACIFIC-OCEAN THERMOHALINE CIRCULATION SURFACE-TEMPERATURE Dubois-Dauphin, Quentin Bonneau, Lucile Colin, Christophe Montero-Serrano, Jean-Carlos Montagna, Paolo Blamart, Dominique Hebbeln, Dierk Van Rooij, David Pons-Branchu, Edwige Hemsing, Freya Wefing, Anne-Marie 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 |
Earth and Environmental Sciences neodymium isotopes cold-water corals Mediterranean outflow water East Antarctic intermediate water Mediterranean sea water Gulf of Cadiz DEEP-SEA CORALS NEODYMIUM ISOTOPIC COMPOSITION HIGH-RESOLUTION RECORD MID-DEPTH CIRCULATION 18 000 YEARS BP OCEAN CIRCULATION PACIFIC-OCEAN THERMOHALINE CIRCULATION SURFACE-TEMPERATURE |
description |
The Nd isotopic composition (epsilon Nd) of seawater and cold-water coral (CWC) samples from the Gulf of Cadiz 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 Cadiz over the past 40 ka. epsilon Nd of glacial and Holocene CWC from the Alboran Sea and the northern Gulf of Cadiz 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; epsilon Nd approximate to -9.4) and Mediterranean Sea Water (MSW; epsilon Nd approximate to -9.9). In contrast, glacial epsilon Nd values for CWC collected at thermocline depth (550-827 m) in the southern Gulf of Cadiz display a higher average value (-8.90.4) compared to the present-day value (-11.70.3). 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 epsilon Nd values (approximate to -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 epsilon Nd values remained stable during the last glacial period, it is suggested that these radiogenic epsilon Nd values most likely reflect an enhanced northward propagation of glacial EAAIW into the eastern Atlantic Basin. |
format |
Article in Journal/Newspaper |
author |
Dubois-Dauphin, Quentin Bonneau, Lucile Colin, Christophe Montero-Serrano, Jean-Carlos Montagna, Paolo Blamart, Dominique Hebbeln, Dierk Van Rooij, David Pons-Branchu, Edwige Hemsing, Freya Wefing, Anne-Marie Frank, Norbert |
author_facet |
Dubois-Dauphin, Quentin Bonneau, Lucile Colin, Christophe Montero-Serrano, Jean-Carlos Montagna, Paolo Blamart, Dominique Hebbeln, Dierk Van Rooij, David Pons-Branchu, Edwige Hemsing, Freya Wefing, Anne-Marie Frank, Norbert |
author_sort |
Dubois-Dauphin, Quentin |
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 |
publishDate |
2016 |
url |
https://biblio.ugent.be/publication/8078729 http://hdl.handle.net/1854/LU-8078729 https://doi.org/10.1002/2016GC006281 https://biblio.ugent.be/publication/8078729/file/8078743 |
geographic |
Antarctic Pacific |
geographic_facet |
Antarctic Pacific |
genre |
Antarc* Antarctic Iceberg* North East Atlantic |
genre_facet |
Antarc* Antarctic Iceberg* North East Atlantic |
op_source |
GEOCHEMISTRY GEOPHYSICS GEOSYSTEMS ISSN: 1525-2027 |
op_relation |
https://biblio.ugent.be/publication/8078729 http://hdl.handle.net/1854/LU-8078729 http://dx.doi.org/10.1002/2016GC006281 https://biblio.ugent.be/publication/8078729/file/8078743 |
op_rights |
No license (in copyright) 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_ |
1768377582696267776 |