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| Dubrulle, C; Jouanneau, J; Lesueur, P; Bourillet, Jean-francois; Weber, O. |
| The study area, "La Grande Vasiere" (LGV), stretches out on the French Atlantic continental shelf (at ca. 100 m water depth), along 250 km from the Glenan Islands at the north to the southwest of Rochebonne at the south. Box-cores were sampled in this mid-shelf area during four cruises in June 1995, and in April, June and September 2002. They were investigated using sedimentologicat approaches (X-radiographs and grain-size analyses) and radionuclide studies (Pb-210 geochronology and excess Th-234). The main results are: (1) the surficial sediments are generally organized into a decimetrescale fining up sequence which can be the result of extreme storms; (2) an upper mixing layer of 7-20cm reflects an important biological benthic activity and/or the impact... |
| Tipo: Text |
Palavras-chave: Bay of Biscay; Continental shelf; Sedimentation rate; Radionuclides; Fine sediment fraction; Mud. |
| Ano: 2007 |
URL: http://archimer.ifremer.fr/doc/2007/publication-3539.pdf |
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| Naughton, F; Bourillet, Jean-francois; Fernanda, M; Turon, J; Jouanneau, J. |
| Vegetation and quantitative climate reconstructions from a northwestern France shelf core (VK0358Bis) show orbital and suborbital climate variability for the last 8850 years in this region. A long-term cooling trend in summer temperatures, marked by gradual temperate and humid forest decline, parallels cooling in Greenland and the decrease of mid-latitude summer insolation reduction until at least 2000 cal. yr BP. At the long-term scale, the lowering in seasonal contrast revealed by vegetation changes follows the increase of precession. Corylus woodlands spread at the expense of deciduous Quercus forest, between 8740 and 8390 cal. yr BP, linked with the high seasonality conditions that, counterbalancing the long-term astronomical forcing trend, were... |
| Tipo: Text |
Palavras-chave: Bay of Biscay; France; Europe; Vegetation; Marine core; Corylus; 8.2 kyr event; Millennial scale climate variability; Long term cooling; Holocene. |
| Ano: 2007 |
URL: http://archimer.ifremer.fr/doc/2007/publication-4205.pdf |
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