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Millennial-scale influence of southern intermediate component water into the North-east Atlantic during the last 40kyr
Dubois-Dauphin, Q.; Colin, C.; Bonneau, L.; Montero-Serrano, J.-C.; Blamart, D.; Van Rooij, D.; Franck, N. (2014). Millennial-scale influence of southern intermediate component water into the North-east Atlantic during the last 40kyr, in: Van Rooij, D. et al. (Ed.) Book of Abstracts. 2nd Deep-Water Circulation Congress: The Contourite Log-book. Ghent, Belgium, 10-12 September 2014. VLIZ Special Publication, 69: pp. 45-46
In: Van Rooij, D.; Rüggeberg, A. (Ed.) (2014). Book of Abstracts. 2nd Deep-Water Circulation Congress: The Contourite Log-book. Ghent, Belgium, 10-12 September 2014. VLIZ Special Publication, 69. Ghent University, Department of Geology and Soil Science/Flanders Marine Institute (VLIZ): Oostende. xviii, 152 pp., more
In: VLIZ Special Publication. Vlaams Instituut voor de Zee (VLIZ): Oostende. ISSN 1377-0950, more

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Keyword
    Marine
Author keywords
    AAIW; Nd isotopes; Deep-sea corals; North Atlantic cold events

Authors  Top 
  • Dubois-Dauphin, Q.
  • Colin, C.
  • Bonneau, L.
  • Montero-Serrano, J.-C.
  • Blamart, D.
  • Van Rooij, D., more
  • Franck, N.

Abstract
    The advection of Antarctic Intermediate Water (AAIW) is important for the distribution of heat, salt, nutrients and carbon to the North Atlantic. However little is known about the links between intermediate water circulation and abrupt climate events such as Heinrich events. Here, we have investigated eNd of seawater and cold-water corals located to the Alboran Sea and to the SE of the Gulf of Cadiz to constrain the present day seawater eNd and to reconstruct the past water mass mixing during the last 37kyr. The coral eNd values range from -8 to -10.4, most likely indicating changes of the dominant water mass provenance. Glacial cold-water corals (from 19 to 37kyr) are characterized by more radiogenic eNd values (> -9.5) compared to the ones from the Holocene demonstrating a decreasing contribution of MOW and/or AAIW in the SE Gulf of Cadiz during climate warming. Strikingly, Heinrich events H2 and H3 reveal even more radiogenic eNd values (~-8). In addition, deep-sea corals from the Alboran Sea indicate that eNd of the MOW do not change significantly trough time. These results points to significant advance of southern component water at 500m depth in the eastern temperate Atlantic.

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