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	Provedor de dados ArchiMer (2) Autor Heyraud, M (2) Buatmenard, P (1) Cherry, Rd (1) Grousset, F (1) Heussner, S (1) Lambert, Ce (1) Radakovitch, O (1) Simpson, W (1) Veron, A (1) Mais... Palavra-chave BIOGENIC CYCLING (1) Bilan de radioélément (1) Enlèvement (1) MARINE POLLUTION (1) Mediterranean Sea (1) Mer Méditerranée (1) NORTH ATLANTIC (1) PB (1) Radionuclide budget (1) Residence time (1) Scavenging (1) Temps de résidence (1) Mais... Tipo do documento Text (2) Ano 1998 (1) 1991 (1) País France (2) Idioma Inglês (2)		Ordenar por:  Relevância Autor Título Ano Registros recuperados: 2 Primeira ... 1 ... Última The role of large biogenic particles in the transport of atmospheric pollutant pb down to north-atlantic sediments ArchiMer Lambert, Ce; Veron, A; Buatmenard, P; Heyraud, M; Grousset, F; Simpson, W. Pb concentrations were measured on large particles (diameter > 10-mu-m) at seven stations in North East Atlantic waters, and Pb isotopic composition was determined on one sediment core (Fluxatlante cruise, 1985). In intermediate and deep waters, Pb concentrations on large particles are about 0.5 ng l-1, less than 1 % of total lead and show a close correlation with Pb-210. This suggests that lead is primarily scavenged from the dissolved Pb pool in surface waters with little further scavenging in deep waters. Such an interpretation is supported by our observation of stable Pb isotopic ratios in surficial sediments which suggests that a rapid coupling exists between the atmospheric input of Pb to surface waters and its delivery to the water-sediment... Tipo: Text Palavras-chave: PB; MARINE POLLUTION; NORTH ATLANTIC; BIOGENIC CYCLING. Ano: 1991 URL: http://archimer.ifremer.fr/doc/00102/21280/18889.pdf Unusual Po-210/Pb-210 ratios in the surface water of the Gulf of Lions ArchiMer Radakovitch, O; Cherry, Rd; Heyraud, M; Heussner, S. Concentrations of Po-210 and Pb-210 have been measured in sea water collected in the Grand Rhone Canyon. Concentrations of Pb-210 are at similar levels to those found in other Mediterranean seawater samples, and are at the levels which would be expected in comparison with global sea water data. The same applies to the Po-210 concentrations in samples from below 100 m depth. Surface samples from above 100 m have Po-210 at levels rather higher than expected, and their Po-210/Pb-210 ratios are about 1 or more as compared with the usual open ocean ratio of about 0.5. These data can be interpreted as indicating another source of supply of Po-210 to the surface layer in addition to the normal atmospheric input. We suggest that an episodic advective particulate... Tipo: Text Palavras-chave: Enlèvement; Mer Méditerranée; Bilan de radioélément; Temps de résidence; Scavenging; Mediterranean Sea; Radionuclide budget; Residence time. Ano: 1998 URL: http://archimer.ifremer.fr/doc/00325/43668/43202.pdf Registros recuperados: 2 Primeira ... 1 ... Última

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