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South Atlantic intermediate water advances into the North-east Atlantic with reduced Atlantic meridional overturning circulation during the last glacial period

Quentin Dubois-Dauphin, Lucile Bonneau, Christophe Colin, Jean-Carlos Montero-Serrano, Paolo Montagna, Dominique Blamart, Dierk Hebbeln, David Van Rooij UGent, Edwige Pons-Branchu, Freya Hemsing, et al. (2016) GEOCHEMISTRY GEOPHYSICS GEOSYSTEMS. 17(6). p.2336-2353
abstract
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.
Please use this url to cite or link to this publication:
author
organization
year
type
journalArticle (original)
publication status
published
subject
keyword
neodymium isotopes, cold-water corals, Mediterranean outflow water, East Antarctic intermediate water, Mediterranean sea water, Gulf of Cadiz, DEEP-SEA CORALS, MEDITERRANEAN OUTFLOW WATER, NEODYMIUM ISOTOPIC COMPOSITION, HIGH-RESOLUTION RECORD, MID-DEPTH CIRCULATION, 18, 000 YEARS BP, OCEAN CIRCULATION, PACIFIC-OCEAN, THERMOHALINE CIRCULATION, SURFACE-TEMPERATURE
journal title
GEOCHEMISTRY GEOPHYSICS GEOSYSTEMS
Geochem. Geophys. Geosyst.
volume
17
issue
6
pages
2336 - 2353
Web of Science type
Article
Web of Science id
000380728300020
JCR category
GEOCHEMISTRY & GEOPHYSICS
JCR impact factor
3.201 (2016)
JCR rank
20/84 (2016)
JCR quartile
1 (2016)
ISSN
1525-2027
DOI
10.1002/2016GC006281
language
English
UGent publication?
yes
classification
A1
copyright statement
I have transferred the copyright for this publication to the publisher
id
8078729
handle
http://hdl.handle.net/1854/LU-8078729
date created
2016-09-15 20:36:31
date last changed
2017-05-04 14:02:04
@article{8078729,
  abstract     = {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.},
  author       = {Dubois-Dauphin, Quentin and Bonneau, Lucile and Colin, Christophe and Montero-Serrano, Jean-Carlos and Montagna, Paolo and Blamart, Dominique and Hebbeln, Dierk and Van Rooij, David and Pons-Branchu, Edwige and Hemsing, Freya and Wefing, Anne-Marie and Frank, Norbert},
  issn         = {1525-2027},
  journal      = {GEOCHEMISTRY GEOPHYSICS GEOSYSTEMS},
  keyword      = {neodymium isotopes,cold-water corals,Mediterranean outflow water,East Antarctic intermediate water,Mediterranean sea water,Gulf of Cadiz,DEEP-SEA CORALS,MEDITERRANEAN OUTFLOW WATER,NEODYMIUM ISOTOPIC COMPOSITION,HIGH-RESOLUTION RECORD,MID-DEPTH CIRCULATION,18,000 YEARS BP,OCEAN CIRCULATION,PACIFIC-OCEAN,THERMOHALINE CIRCULATION,SURFACE-TEMPERATURE},
  language     = {eng},
  number       = {6},
  pages        = {2336--2353},
  title        = {South Atlantic intermediate water advances into the North-east Atlantic with reduced Atlantic meridional overturning circulation during the last glacial period},
  url          = {http://dx.doi.org/10.1002/2016GC006281},
  volume       = {17},
  year         = {2016},
}

Chicago
Dubois-Dauphin, Quentin, Lucile Bonneau, Christophe Colin, Jean-Carlos Montero-Serrano, Paolo Montagna, Dominique Blamart, Dierk Hebbeln, et al. 2016. “South Atlantic Intermediate Water Advances into the North-east Atlantic with Reduced Atlantic Meridional Overturning Circulation During the Last Glacial Period.” Geochemistry Geophysics Geosystems 17 (6): 2336–2353.
APA
Dubois-Dauphin, Q., Bonneau, L., Colin, C., Montero-Serrano, J.-C., Montagna, P., Blamart, D., Hebbeln, D., et al. (2016). South Atlantic intermediate water advances into the North-east Atlantic with reduced Atlantic meridional overturning circulation during the last glacial period. GEOCHEMISTRY GEOPHYSICS GEOSYSTEMS, 17(6), 2336–2353.
Vancouver
1.
Dubois-Dauphin Q, Bonneau L, Colin C, Montero-Serrano J-C, Montagna P, Blamart D, et al. South Atlantic intermediate water advances into the North-east Atlantic with reduced Atlantic meridional overturning circulation during the last glacial period. GEOCHEMISTRY GEOPHYSICS GEOSYSTEMS. 2016;17(6):2336–53.
MLA
Dubois-Dauphin, Quentin, Lucile Bonneau, Christophe Colin, et al. “South Atlantic Intermediate Water Advances into the North-east Atlantic with Reduced Atlantic Meridional Overturning Circulation During the Last Glacial Period.” GEOCHEMISTRY GEOPHYSICS GEOSYSTEMS 17.6 (2016): 2336–2353. Print.