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Deep circulation in the equatorial Atlantic Ocean ArchiMer
Gouriou, Y; Andrie, C; Bourles, B; Freudenthal, S; Arnault, S; Aman, A; Eldin, G; Du Penhoat, Y; Baurand, F; Gallois, F; Chuchla, R.
In the Atlantic Ocean, the northward export of warm surface water is compensated by a southward flow of cold North Atlantic Deep Water (NADW). The NADW is transported southward along the American continental margin within the Deep Western Boundary Current (DWBC). Some tracer and float observations have shown that part of the DWBC water flows eastward along the equator. Here we present three meridional velocity sections which give an instantaneous image of the top-to-bottom zonal circulation along the equatorial Atlantic. They reveal the presence of Equatorial Deep Jets (EDJs) between 1 degrees 30'N and 1 degrees 30'S, alternating eastward-westward currents with short vertical scale, surrounded by columns of eastward currents (the Extra Equatorial Jets or...
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Ano: 2001 URL: http://archimer.ifremer.fr/doc/00000/10369/9567.pdf
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The influence of Congo River discharges in the surface and deep layers of the Gulf of Guinea ArchiMer
Vangriesheim, Annick; Pierre, C; Aminot, Alain; Metzl, N; Baurand, F; Caprais, Jean-claude.
The main feature of the Congo-Angola margin in the Gulf of Guinea is the Congo (ex-Zaire) deep-sea fan composed of a submarine canyon directly connected to the Congo River, a channel and a [sediment] lobe area. During the multi-disciplinary programme called BIOZAIRE conducted by Ifremer from 2000 to 2005, two CTD-O2 sections with discrete water column samples were performed (BIOZAIRE3 cruise: 2003-2004) to study the influence of the Congo River discharges, both in the surface layer and in the deep and near-bottom layers. The surface layer water is greatly diluted with river water that has a heavy particle load. The deep layer is affected by episodic turbidity currents that flow in the deep Congo channel and reach deep areas far from the coast. Previous...
Tipo: Text Palavras-chave: DIC; Stable isotopes; Nutrient anomaly; Oxygen anomaly; Congo canyon; Gulf of Guinea.
Ano: 2009 URL: http://archimer.ifremer.fr/doc/2009/publication-6737.pdf
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