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| 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 |
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| Lambert, Ce; Nicolas, E; Veron, A; Buatmenard, P; Klinkhammer, G; Lecorre, P; Morin, P. |
| We have investigated total Pb distributions in the water column from various sites in the north-east Atlantic. Sea water samples were collected during the Fluxatlante cruise in 1985. Total Pb ranged from 35 to 45 ng.l-1 (170-220 pmol l-1) in surface waters and decreased with depth in a manner consistent with previous findings. The high concentrations in surface waters probably reflect an important anthropogenic input of Pb from the atmosphere. Concentrations of total Pb are higher than in the western Atlantic. This difference seems to be closely related to the difference in atmospheric inputs of anthropogenic Pb. Three of the stations exhibit a specific Pb excess at the depth of the Mediterranean waters outflowing in the intermediate Atlantic waters; such... |
| Tipo: Text |
Palavras-chave: TOTAL PB; NORTH ATLANTIC; MEDDY; POLLUTION. |
| Ano: 1991 |
URL: http://archimer.ifremer.fr/doc/00102/21279/18888.pdf |
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