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Cellule communication université Paris Diderot. (2008). Des chercheurs de l’Université en mission aux Kerguelen.
Abstract: Explication des objectifs, des moyens et des réalisations de la campagne FLATOCOA
Site web université Paris-Diderot
Programme: 1188
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J.P. Braly. (2008). Un océan et des poussières….
Abstract: Début novembre, deux chercheurs embarqueront pour « l’archipel de la désolation ». Objectif : étudier les micronutriments apportés par l’air des continents, indispensables aux microalgues pompant le CO2 issu de l’atmosphère.
Journal du CNRS
Programme: 1188
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Comeau S., Gorsky G., Jeffree R., Teyssié J. L. & Gattuso J.-P. (2009). Impact of ocean acidification on a key Arctic pelagic mollusc (Limacina helicina). BIOGEOSCIENCES, 6, 1877–1882.
Abstract: Thecosome pteropods (shelled pelagic molluscs) can play an important role in the food web of various ecosystems
and play a key role in the cycling of carbon and carbonate. Since they harbor an aragonitic shell, they could be
very sensitive to ocean acidification driven by the increase of anthropogenic CO2 emissions. The impact of changes in
the carbonate chemistry was investigated on Limacina helicina, a key species of Arctic ecosystems. Pteropods were kept
in culture under controlled pH conditions corresponding to pCO2 levels of 350 and 760μatm. Calcification was estimated using a fluorochrome and the radioisotope 45Ca. It exhibits a 28% decrease at the pH value expected for 2100
compared to the present pH value. This result supports the concern for the future of pteropods in a high-CO2 world, as
well as of those species dependent upon them as a food resource.
A decline of their populations would likely cause
dramatic changes to the structure, function and services of
polar ecosystems.
Programme: 1008
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Myriam Guillevic. (2009). Mesure des isotopes 16, 17 et 18 de l'oxygène dans la molécule d'eau, étude de leur variabilité lors des changements de phase vapeur-précipitations et sur des cycles saisonniers sur le site de NEEM, Groenland Master 1 UVSQ.
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Gattuso J.-P., Comeau S. & Maier C. (2009). Impact of ocean acidification on marine snails and deep-sea corals. (Vol. 73).
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Comeau S., Alliouane S., Gorsky G., Jeffree R., Teyssié J.-L. & Gattuso J.-P. (2009). Response of Arctic and Mediterranean pteropods to ocean acidification..
Abstract: Réunion IMBER-SOLAS France, Paris.
Programme: 1008
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Comeau S., Gorsky G., Teyssié J.-L., Jeffree R. & Gattuso J.-P. (2008). Response of Mediterranean and Arctic pteropods to ocean acidification.
Abstract: he Oceans in a High CO2 World II, Monaco
Programme: 1008
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De Vleeschouwer F., Van Vliet Lanoë B, Fagel N. (2008). Long term mobilisation of chemical elements in tephra-rich peat (NE Iceland). APPLIED GEOCHEMISTRY, 23, 3819–3839.
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Van Vliet-Lanoë B., V.Andrieu-Ponel, P. Auguste, H. Bellon, V. Bout-Roumazeille, D.Cliquet , N.Combourieux-Neubout, E. Gandouin, Hallégouët B., A. Gudmundsson, H. Guillou, M.Meurisse-Fort, G. Gosselin, C. Verpoorter. (2008). The Mid-Eemian Cooling, Land and Sea Conections: Orbitally Forced Sea Ice Extend and its Influence on the Thermohaline Circulation. IGBP 495 Faro Portugal from 27th October to 1st November 2008..
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Toucanne S., S. Zaragosi , J.F. Bourillet , M. Cremer , F. Eynaud, B. Van Vliet-Lanoë , C. Fontanier J.L. Turon , E. Cortijo and P.L. Gibbard. (2009). Timing of massive 'Fleuve Manche' discharges over the last 350 kyr: insights into the European Ice Sheet oscillations and the European drainage network from MIS 10 to 2. Quat Sci Rev, 28, 1238–1256.
Abstract: Continuous high-resolution mass accumulation rates (MAR) and X-ray fluorescence (XRF) measurements
from marine sediment records in the Bay of Biscay (NE Atlantic) have allowed the determination of thetiming and the amplitude of the ‘Fleuve Manche’ (Channel River) discharges during glacial stages MIS 10,MIS 8, MIS 6 and MIS 4–2. These results have yielded detailed insight into the Middle and Late Pleistocene glaciations in Europe and the drainage network of the western and central European rivers over the last 350 kyr. This study provides clear evidence that the ‘Fleuve Manche’ connected the southern North Sea basin with the Bay of Biscay during each glacial period and reveals that ‘Fleuve Manche’ activity during the glaciations MIS 10 and MIS 8 was significantly less than during MIS 6 and MIS 2. We correlate the significant ‘Fleuve Manche’ activity, detected during MIS 6 and MIS 2, with the extensive Saalian (Drenthe Substage) and the Weichselian glaciations, respectively, confirming that the major Elsterian glaciation precedes the glacial MIS 10. In detail, massive ‘Fleuve Manche’ discharges occurred at ca 155 ka (mid-MIS 6) and during Termination I, while no significant discharges are found during Termination II. It is assumed that a substantial retreat of the European ice sheet at ca 155 kyr, followed by the formation of ice-free conditions between the British Isles and Scandinavia until Termination II, allowed meltwater to flow northwards through the North Sea basin during the second part of the MIS 6. We assume that this glacial pattern corresponds to the Warthe Substage glacial maximum, therefore indicating that the data presented here equates to the Drenthe and the Warthe glacial advances at ca 175–160 ka and ca 150–140 ka, respectively. Finally, the correlation of our records with ODP site 980 reveals that massive ‘Fleuve Manche’ discharges, related to partial or complete melting of the European ice masses, were synchronous with strong decreases in both the rate of deep-water formation and the strength of the Atlantic thermohaline circulation. ‘Fleuve Manche’ discharges over the last 350 kyr probably participated, with other meltwater sources, in the collapse of the thermohaline circulation by freshening the northern Atlantic surface water.
Programme: 316
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