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Titolo:
Lead sources and transfer in the coastal Mediterranean: evidence from stable lead isotopes in marine particles
Autore:
Alleman, LY; Hamelin, B; Veron, AJ; Miquel, JC; Heussner, S;
Indirizzi:
Univ Aix Marseille 3, CNRS, CEREGE, F-13545 Aix En Provence 4, France UnivAix Marseille 3 Aix En Provence France 4 Aix En Provence 4, France Marine Environm Labs, IAEA, MC-98000 Monaco, Monaco Marine Environm Labs Monaco Monaco MC-98000 AEA, MC-98000 Monaco, Monaco Univ Perpignan, URA 715, CEFREM, F-66860 Perpignan, France Univ PerpignanPerpignan France F-66860 EFREM, F-66860 Perpignan, France Univ Delaware, Coll Marine Studies, Newark, DE 19716 USA Univ Delaware Newark DE USA 19716 ll Marine Studies, Newark, DE 19716 USA
Titolo Testata:
DEEP-SEA RESEARCH PART II-TOPICAL STUDIES IN OCEANOGRAPHY
fascicolo: 9-11, volume: 47, anno: 2000,
pagine: 2257 - 2279
SICI:
0967-0645(2000)47:9-11<2257:LSATIT>2.0.ZU;2-P
Fonte:
ISI
Lingua:
ENG
Soggetto:
WESTERN NORTH-ATLANTIC; TRACE-ELEMENTS; CONTINENTAL-MARGIN; ATMOSPHERIC INPUT; SURFACE WATERS; ARTIFICIAL RADIONUCLIDES; ECOMARGE EXPERIMENT; ANTHROPOGENIC LEAD; SEDIMENT TRAP; SAHARAN DUST;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Agriculture,Biology & Environmental Sciences
Physical, Chemical & Earth Sciences
Citazioni:
63
Recensione:
Indirizzi per estratti:
Indirizzo: Alleman, LY Univ Aix Marseille 3, CNRS, CEREGE, BP 80, F-13545 Aix En Provence 4, France Univ Aix Marseille 3 BP 80 Aix En Provence France 4 4, France
Citazione:
L.Y. Alleman et al., "Lead sources and transfer in the coastal Mediterranean: evidence from stable lead isotopes in marine particles", DEEP-SEA II, 47(9-11), 2000, pp. 2257-2279

Abstract

Time series of settling and suspended particles have been collected by sediment traps and in situ pumps respectively, under contrasted hydrographic conditions in the Gulf of Lions and the Ligurian Sea, northwestern Mediterranean. Lead concentrations measured in sediment trap samples vary from 41 +/- 7 ppm in the Ligurian Sea to 58 +/- 10 ppm in the Gulf of Lions. These concentrations, 2-10 times lower than those measured previously in the Gulf of Lions, reflect the reduction of lead fallout from gasoline during the last decade. While atmospheric lead still originates mainly from anthropogenicemissions (automotive and industrial exhausts), stable lead isotopes demonstrate that anthropogenic and lithogenic lead are in similar proportions inthe marine particles from the northwestern Mediterranean. Sequential extraction analyses performed on trap samples suggest that the isotopic variations can be explained by a three-component mixing between anthropogenic, natural soluble, and natural refractory sources. In the suspended particulate matter from the Gulf of Lions, lead concentrations range from 0.2 to 30 ng/l, with isotopic compositions comparable to those of the settling particles (Pb-206/Pb-207 from 1.165 to 1.178). This indicates a common origin in these two types of particles, probably mainly controlled by the Rhone River discharge and by resuspension processes on the continental shelf. By contrast,lead concentrations are lower in the suspended matter samples from the Ligurian Sea (0.5 to 1.7 ng/l). In this case, the isotopic signature (1.165 +/- 0.002) is in equilibrium with the dissolved fraction, as previously foundin other oligotrophic sites in the open ocean, where the suspended particles are mainly of biological origin and lead essentially authigenic in theseparticles. (C) 2000 Elsevier Science Ltd. All rights reserved.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 03/12/20 alle ore 16:05:25