Contrasting paleoceanographic conditions off Morocco during Heinrich events (1 and 2) and the Last Glacial Maximum
Past hydrological and primary productivity regimes, on the basis of dinocyst and foraminiferal fossil assemblages as well as on stable isotopes (O, C) and alkenones, were investigated over the last 30 ka at upwelling site MD04-2805 CQ off Morocco. The results show highest upwelling intensity during...
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ftcsic:oai:digital.csic.es:10261/43611 2024-02-11T10:05:55+01:00 Contrasting paleoceanographic conditions off Morocco during Heinrich events (1 and 2) and the Last Glacial Maximum Penaud, A. Eynaud, F. Blamart, Dominique Rossignol, L. Marret, F. López-Martínez, Constancia Grimalt, Joan O. Malaizé, B. Charlier, K. 2010 http://hdl.handle.net/10261/43611 https://doi.org/10.1016/j.quascirev.2010.04.011 en eng Elsevier http://dx.doi.org/10.1016/j.quascirev.2010.04.011 Quaternary Science Reviews 0277-3791 http://hdl.handle.net/10261/43611 doi:10.1016/j.quascirev.2010.04.011 1873-457X none artículo http://purl.org/coar/resource_type/c_6501 2010 ftcsic https://doi.org/10.1016/j.quascirev.2010.04.011 2024-01-16T09:35:09Z Past hydrological and primary productivity regimes, on the basis of dinocyst and foraminiferal fossil assemblages as well as on stable isotopes (O, C) and alkenones, were investigated over the last 30 ka at upwelling site MD04-2805 CQ off Morocco. The results show highest upwelling intensity during Heinrich event (HE) 1, time-coeval with a distinct plateau of heavy planktonic δ13C values, high concentrations of Pinus pollen and heterotrophic dinocysts, caused by an increased northern wind regime. In addition, we also present regional reconstructions of paleo-sea-surface temperatures (SSTs) using three different proxy tools: dinocyst and foraminiferal transfer functions as well as alkenones (Uk′37 – SST). The reconstructed SSTs depict coherent scenarios as modulated by the typical Northern Hemisphere climatic fluctuations. Furthermore, specific occurrences of the dinocyst Spiniferites lazus and of the foraminifer Turborotalita quinqueloba are noted for HE 2, HE 1, and the Younger Dryas, whereas in the Alboran Sea and in peri-Iberian waters these cold events were accompanied by the dinocyst Bitectatodinium tepikiense and the subpolar foraminifer Neogloboquadrina pachyderma s., both implying a marked southward shift in the planktonic population in response to the migration of polar water masses. This very pronounced demarcation between the planktonic communities better seems to attest the presence of a distinct hydrological structure in proximity of the strait of Gibraltar which separated at that time African (north of Morocco) from European (southern Iberia) water masses. IPEV, the captain and the crew of the Marion Dufresne and the scientific team of the PRIVILEGE cruise. We wish to thank Mr. Y. Balut for his assistance at sea and M. Castera, and O. Ther for invaluable technical assistance at the laboratory. We gratefully acknowledge the reviewers, whose comments permit to greatly improve this manuscript. Part of this study was supported by the French CNRS. Peer reviewed Article in Journal/Newspaper Neogloboquadrina pachyderma Digital.CSIC (Spanish National Research Council) Quaternary Science Reviews 29 15-16 1923 1939 |
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Open Polar |
collection |
Digital.CSIC (Spanish National Research Council) |
op_collection_id |
ftcsic |
language |
English |
description |
Past hydrological and primary productivity regimes, on the basis of dinocyst and foraminiferal fossil assemblages as well as on stable isotopes (O, C) and alkenones, were investigated over the last 30 ka at upwelling site MD04-2805 CQ off Morocco. The results show highest upwelling intensity during Heinrich event (HE) 1, time-coeval with a distinct plateau of heavy planktonic δ13C values, high concentrations of Pinus pollen and heterotrophic dinocysts, caused by an increased northern wind regime. In addition, we also present regional reconstructions of paleo-sea-surface temperatures (SSTs) using three different proxy tools: dinocyst and foraminiferal transfer functions as well as alkenones (Uk′37 – SST). The reconstructed SSTs depict coherent scenarios as modulated by the typical Northern Hemisphere climatic fluctuations. Furthermore, specific occurrences of the dinocyst Spiniferites lazus and of the foraminifer Turborotalita quinqueloba are noted for HE 2, HE 1, and the Younger Dryas, whereas in the Alboran Sea and in peri-Iberian waters these cold events were accompanied by the dinocyst Bitectatodinium tepikiense and the subpolar foraminifer Neogloboquadrina pachyderma s., both implying a marked southward shift in the planktonic population in response to the migration of polar water masses. This very pronounced demarcation between the planktonic communities better seems to attest the presence of a distinct hydrological structure in proximity of the strait of Gibraltar which separated at that time African (north of Morocco) from European (southern Iberia) water masses. IPEV, the captain and the crew of the Marion Dufresne and the scientific team of the PRIVILEGE cruise. We wish to thank Mr. Y. Balut for his assistance at sea and M. Castera, and O. Ther for invaluable technical assistance at the laboratory. We gratefully acknowledge the reviewers, whose comments permit to greatly improve this manuscript. Part of this study was supported by the French CNRS. Peer reviewed |
format |
Article in Journal/Newspaper |
author |
Penaud, A. Eynaud, F. Blamart, Dominique Rossignol, L. Marret, F. López-Martínez, Constancia Grimalt, Joan O. Malaizé, B. Charlier, K. |
spellingShingle |
Penaud, A. Eynaud, F. Blamart, Dominique Rossignol, L. Marret, F. López-Martínez, Constancia Grimalt, Joan O. Malaizé, B. Charlier, K. Contrasting paleoceanographic conditions off Morocco during Heinrich events (1 and 2) and the Last Glacial Maximum |
author_facet |
Penaud, A. Eynaud, F. Blamart, Dominique Rossignol, L. Marret, F. López-Martínez, Constancia Grimalt, Joan O. Malaizé, B. Charlier, K. |
author_sort |
Penaud, A. |
title |
Contrasting paleoceanographic conditions off Morocco during Heinrich events (1 and 2) and the Last Glacial Maximum |
title_short |
Contrasting paleoceanographic conditions off Morocco during Heinrich events (1 and 2) and the Last Glacial Maximum |
title_full |
Contrasting paleoceanographic conditions off Morocco during Heinrich events (1 and 2) and the Last Glacial Maximum |
title_fullStr |
Contrasting paleoceanographic conditions off Morocco during Heinrich events (1 and 2) and the Last Glacial Maximum |
title_full_unstemmed |
Contrasting paleoceanographic conditions off Morocco during Heinrich events (1 and 2) and the Last Glacial Maximum |
title_sort |
contrasting paleoceanographic conditions off morocco during heinrich events (1 and 2) and the last glacial maximum |
publisher |
Elsevier |
publishDate |
2010 |
url |
http://hdl.handle.net/10261/43611 https://doi.org/10.1016/j.quascirev.2010.04.011 |
genre |
Neogloboquadrina pachyderma |
genre_facet |
Neogloboquadrina pachyderma |
op_relation |
http://dx.doi.org/10.1016/j.quascirev.2010.04.011 Quaternary Science Reviews 0277-3791 http://hdl.handle.net/10261/43611 doi:10.1016/j.quascirev.2010.04.011 1873-457X |
op_rights |
none |
op_doi |
https://doi.org/10.1016/j.quascirev.2010.04.011 |
container_title |
Quaternary Science Reviews |
container_volume |
29 |
container_issue |
15-16 |
container_start_page |
1923 |
op_container_end_page |
1939 |
_version_ |
1790603253932621824 |