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Titolo:
LEAD ISOTOPES IN THE WESTERN NORTH-ATLANTIC - TRANSIENT TRACERS OF POLLUTANT LEAD INPUTS
Autore:
VERON AJ; CHURCH TM; FLEGAL AR;
Indirizzi:
CNRS,UMR6536,CEREGE,BP80 F-13545 AIX PROVENCE 04 FRANCE UNIV DELAWARE,COLL MARINE STUDIES NEWARK DE 19716 UNIV CALIF SANTA CRUZ,WIGS SANTA CRUZ CA 95064
Titolo Testata:
Environmental research (New York, N.Y. : Print)
fascicolo: 2, volume: 78, anno: 1998,
pagine: 104 - 111
SICI:
0013-9351(1998)78:2<104:LIITWN>2.0.ZU;2-1
Fonte:
ISI
Lingua:
ENG
Soggetto:
PB-ISOTOPES; SKELETAL CONCENTRATIONS; ANTHROPOGENIC LEAD; SARGASSO SEA; METALS; OCEAN; INDUSTRIAL; AEROSOLS; PRECIPITATION; ATMOSPHERE;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Science Citation Index Expanded
Science Citation Index Expanded
Citazioni:
60
Recensione:
Indirizzi per estratti:
Citazione:
A.J. Veron et al., "LEAD ISOTOPES IN THE WESTERN NORTH-ATLANTIC - TRANSIENT TRACERS OF POLLUTANT LEAD INPUTS", Environmental research (New York, N.Y. : Print), 78(2), 1998, pp. 104-111

Abstract

In the early 1980s, Patterson and colleagues demonstrated that most lead in oceanic surface waters had an anthropogenic origin. Their discovery occurred during the phasing out of leaded gasoline in North America initiated in the previous decade. The corresponding decrease in anthropogenic lead emissions, verified by Pb/Pb-210 ratios, accounted forthe systematic decline in lead concentrations in surface waters of the western Sargasso Sea. Subsequent changes in anthropogenic lead inputs to the western Sargasso Sea surface waters have been documented by measurements of lead concentrations, isotopic compositions (Pb-206/Pb-207, Pb-208/Pb-206), and Pb/Pb-210 ratios in precipitation and seawaterfor the period of 1981 to 1994. These data indicate the easterly trade winds are now the primary source of atmospheric lead in Bermuda, andthey confirm that the decline of lead concentrations in the North Atlantic is associated with the phasing out of leaded gasoline in North America and western Europe over the past decade. Moreover, temporal variations in the relative contribution of industrial lead inputs from the two sides of the North Atlantic over that period can be quantified based on differences in their isotopic composition. The transient character of those isotopic signatures also allows calculations of pollutant lead penetration rates into the mixed layer and upper thermocline ofthe western Sargasso Sea. (C) 1998 Academic Press.

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Documento generato il 26/09/20 alle ore 14:42:16