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Titolo:
TEMPORAL VARIATIONS IN LEAD CONCENTRATIONS AND ISOTOPIC COMPOSITION IN THE SOUTHERN CALIFORNIA BIGHT
Autore:
SANUDOWILHELMY SA; FLEGAL AR;
Indirizzi:
SUNY STONY BROOK,MARINE SCI RES CTR,INST WASTE MANAGEMENT STONY BROOKNY 11794 UNIV CALIF SANTA CRUZ,EARTH SCI BOARD SANTA CRUZ CA 95064
Titolo Testata:
Geochimica et cosmochimica acta
fascicolo: 15, volume: 58, anno: 1994,
pagine: 3315 - 3320
SICI:
0016-7037(1994)58:15<3315:TVILCA>2.0.ZU;2-O
Fonte:
ISI
Lingua:
ENG
Soggetto:
SAN-PEDRO BASINS; NORTHEAST PACIFIC; COASTAL WATERS; VARIABILITY; MONICA;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Science Citation Index Expanded
Citazioni:
32
Recensione:
Indirizzi per estratti:
Citazione:
S.A. Sanudowilhelmy e A.R. Flegal, "TEMPORAL VARIATIONS IN LEAD CONCENTRATIONS AND ISOTOPIC COMPOSITION IN THE SOUTHERN CALIFORNIA BIGHT", Geochimica et cosmochimica acta, 58(15), 1994, pp. 3315-3320

Abstract

Lead concentrations in surface waters of the Southern California Bight appear to have decreased threefold (from >170 to <60 pM) since they were initially measured by Clair Patterson and his associates in the 1970s. The decrease parallels a threefold decline in anthropogenic inputs of industrial lead to the bight over the past two decades. Moreover, mass balance calculations indicate that the primary source of lead to the bight now is upwelling. This is evidenced by the isotopic compositions of surface waters in the bight, which are most characteristic of Asian industrial lead aerosols (0.4793 less than or equal to Pb-206/Pb-208 less than or equal to 0.4833) deposited in oceanic waters of the North Pacific. While the decrease in surface water lead concentrations in the bight reflects the reduction in industrial lead emissions from the United States, the isotopic compositions of surface waters in the southern reach of the bight reflect a concurrent increase in industrial lead emissions from Mexico (0.4852 less than or equal to(206)Pb/Pb-208 less than or equal to 0.4877). The isotopic composition (Pb-208/Pb-207 approximate to 2.427) of elevated lead concentrations of surface waters in San Diego Bay indicate that lead is being remobilized fromcontaminated sediments within that bay.

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Documento generato il 24/10/20 alle ore 13:54:29