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 (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 mid-depth water mass dynamics within the Gulf of Cádiz over the past 40 ka. εNd of glacial and Holocene CWC fro...
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Online Access: | https://doi.org/10.1002/2016GC006281 https://archimer.ifremer.fr/doc/00339/45047/44446.pdf https://archimer.ifremer.fr/doc/00339/45047/ |
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fttriple:oai:gotriple.eu:10670/1.ns3y0b 2023-05-15T14:05:27+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 https://doi.org/10.1002/2016GC006281 https://archimer.ifremer.fr/doc/00339/45047/44446.pdf https://archimer.ifremer.fr/doc/00339/45047/ en eng Amer Geophysical Union doi:10.1002/2016GC006281 10670/1.ns3y0b https://archimer.ifremer.fr/doc/00339/45047/44446.pdf https://archimer.ifremer.fr/doc/00339/45047/ other Archimer, archive institutionnelle de l'Ifremer Geochemistry Geophysics Geosystems (1525-2027) (Amer Geophysical Union), 2016-06 , Vol. 17 , N. 6 , P. 2336-2353 envir geo Text https://vocabularies.coar-repositories.org/resource_types/c_18cf/ fttriple https://doi.org/10.1002/2016GC006281 2023-01-22T16:47:43Z 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 mid-depth 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 mid-depth 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. Text Antarc* Antarctic Iceberg* North East Atlantic Unknown Antarctic Geochemistry, Geophysics, Geosystems 17 6 2336 2353 |
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envir geo 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 |
envir geo |
description |
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 mid-depth 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 mid-depth 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. |
format |
Text |
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 |
publisher |
Amer Geophysical Union |
url |
https://doi.org/10.1002/2016GC006281 https://archimer.ifremer.fr/doc/00339/45047/44446.pdf https://archimer.ifremer.fr/doc/00339/45047/ |
geographic |
Antarctic |
geographic_facet |
Antarctic |
genre |
Antarc* Antarctic Iceberg* North East Atlantic |
genre_facet |
Antarc* Antarctic Iceberg* North East Atlantic |
op_source |
Archimer, archive institutionnelle de l'Ifremer Geochemistry Geophysics Geosystems (1525-2027) (Amer Geophysical Union), 2016-06 , Vol. 17 , N. 6 , P. 2336-2353 |
op_relation |
doi:10.1002/2016GC006281 10670/1.ns3y0b https://archimer.ifremer.fr/doc/00339/45047/44446.pdf https://archimer.ifremer.fr/doc/00339/45047/ |
op_rights |
other |
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_ |
1766277349010046976 |