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Titolo:
Role of oceanic circulation on contaminant lead distribution in the South Atlantic
Autore:
Alleman, LY; Church, TM; Ganguli, P; Veron, AJ; Hamelin, B; Flegal, AR;
Indirizzi:
Univ Delaware, Coll Marine Studies, Newark, DE 19716 USA Univ Delaware Newark DE USA 19716 ll Marine Studies, Newark, DE 19716 USA Univ Aix Marseille 3, CEREGE UMR 6635, F-13545 Aix En Provence 4, France Univ Aix Marseille 3 Aix En Provence France 4 Aix En Provence 4, France Univ Calif Santa Cruz, WIGS, Santa Cruz, CA 95064 USA Univ Calif Santa Cruz Santa Cruz CA USA 95064 S, Santa Cruz, CA 95064 USA
Titolo Testata:
DEEP-SEA RESEARCH PART II-TOPICAL STUDIES IN OCEANOGRAPHY
fascicolo: 13, volume: 48, anno: 2001,
pagine: 2855 - 2876
SICI:
0967-0645(2001)48:13<2855:ROOCOC>2.0.ZU;2-V
Fonte:
ISI
Lingua:
ENG
Soggetto:
WESTERN NORTH-ATLANTIC; ANTARCTIC BOTTOM WATER; SAN-FRANCISCO BAY; ANTHROPOGENIC LEAD; TRACE-METALS; ISOTOPIC EVIDENCE; EQUATORIAL ATLANTIC; TRANSIENT TRACERS; BOUNDARY CURRENT; SURFACE WATERS;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Agriculture,Biology & Environmental Sciences
Physical, Chemical & Earth Sciences
Citazioni:
94
Recensione:
Indirizzi per estratti:
Indirizzo: Church, TM Univ Delaware, Coll Marine Studies, Newark, DE 19716 USA Univ Delaware Newark DE USA 19716 tudies, Newark, DE 19716 USA
Citazione:
L.Y. Alleman et al., "Role of oceanic circulation on contaminant lead distribution in the South Atlantic", DEEP-SEA II, 48(13), 2001, pp. 2855-2876

Abstract

Both the relatively high lead concentrations and their characteristic anthropogenic isotopic compositions attest to the widespread contamination of industrial lead in the western Equatorial and South Atlantic Ocean. Spatial gradients in those isotopic signatures evidence the conservative lateral transport of lead in oceanic water masses, while the discrete isotopic signatures in deep oceanic waters substantiate the complementary hypothesis that the release of lead from settling particles is relatively small on a decadal time-scale. Specifically, the relatively low radiogenic lead (e.g., Pb-206/Pb-207, 1.148 +/- 0.009) in the Lower-North Atlantic Deep Water (1-NADW) south of 10 degrees North is primarily attributed to US industrial lead emitted in the Northern Hemisphere prior to 1965, and the more radiogenic lead(e.g., Pb-206/Pb-207 = 1.180 +/- 0.006) in the Upper-North Atlantic Deep Water (u-NADW) is primarily attributed to subsequent industrial lead emissions in that hemisphere. In contrast, the relatively radiogenic lead (e.g., Pb-206/Pb-207,1.186 +/- 0.007) in the Antarctic Bottom Water (AABW) seemingly reflects a mixture of natural and anthropogenic lead sources within the Southern Hemisphere; and its isotopic dissimilarity with that (e.g., Pb-206/Pb-207 = 1.159 +/- 0.002) of Antarctic Intermediate Water (AAIW) and the AABW may be due to differences in either their aeolian or water-mass inputs. (C) 2001 Published by Elsevier Science Ltd.

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Documento generato il 18/09/20 alle ore 20:07:19