Catalogo Articoli (Spogli Riviste)

OPAC HELP

Titolo:
Isotopic evidence of contaminant lead in the South Atlantic troposphere and surface waters
Autore:
Alleman, LY; Church, TM; Veron, AJ; Kim, G; Hamelin, B; Flegal, AR;
Indirizzi:
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 Delaware, Coll Marine Studies, Newark, DE 19716 USA Univ Delaware Newark DE USA 19716 ll Marine Studies, Newark, DE 19716 USA 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: 2811 - 2827
SICI:
0967-0645(2001)48:13<2811:IEOCLI>2.0.ZU;2-Y
Fonte:
ISI
Lingua:
ENG
Soggetto:
WESTERN NORTH-ATLANTIC; ATMOSPHERIC TRACE-METALS; ANTHROPOGENIC LEAD; PARTICULATE LEAD; VOLCANIC-ROCKS; ANTARCTIC SNOW; WET DEPOSITION; SARGASSO SEA; HEAVY-METALS; ISLAND ARCS;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Agriculture,Biology & Environmental Sciences
Physical, Chemical & Earth Sciences
Citazioni:
61
Recensione:
Indirizzi per estratti:
Indirizzo: Veron, AJ Univ Aix Marseille 3, CEREGE UMR 6635, BP80, F-13545 Aix En Provence 4, France Univ Aix Marseille 3 BP80 Aix En Provence France 4 ce 4, France
Citazione:
L.Y. Alleman et al., "Isotopic evidence of contaminant lead in the South Atlantic troposphere and surface waters", DEEP-SEA II, 48(13), 2001, pp. 2811-2827

Abstract

The third Intergovernmental Oceanographic Commission (IOC) Baseline Contaminant cruise (May-June 1996) has established the first lead isotopic compositions in the surface water and the atmosphere of the Equatorial and South Atlantic Ocean. These ratios have evidenced both anthropogenic and natural origins of lead along the cruise transect (from 33 degreesS to 10 degreesN). The isotopic gradients tentatively have been, attributed to aeolian as well as surface-water advective inputs from a suite of rather local and remote sources to the Southern Hemisphere. Relatively low Pb-206/Pb-207 ratios (x +/- sd) were encountered within the South Equatorial Current between 17 degreesS and 5 degreesS (1.156 +/- 0.003). Those were bracketed by more radiogenic ratios at higher latitudes in the Southern Hemisphere (33 degreesS to 23 degreesS), within the Brazil Current and the Subtropical Gyre (1.163 +/- 0.003), and in the Northern Hemisphere (0 degrees to 10 degreesN) (1.165+/- 0.005). The latter were comparable to ratios of surface water in the North Atlantic Equatorial Ocean (1.169 +/- 0.006), under a combined contaminant influence of both North American westerlies (1.19-1.20) and European easterlies (1.155-1.165). That predominance of contaminant lead contrasts with the measurable presence of natural lead in surface waters of the Equatorial Ocean, which are attributed to aeolian inputs of Saharan dust. The ratios of lead in surface waters at higher latitudes in the South Atlantic are characteristic of anthropogenic lead aerosols also detected in Antarctic ice, and could substantiate as well the hypothesized aerosol recycling of leadby sea-spray emission in the far Southern Hemisphere. The atmospheric leadisotopic compositions (Pb-206/Pb-207) in bulk depositions (1.171 +/- 0.006), precipitation (1.171 +/- 0.006) and aerosols (1.168 +/- 0.011) were, generally, more radiogenic than the surface waters (1.162 +/- 0.005). Beside apoor representation of a short term atmospheric sampling, this difference could reflect a recent evolution in atmospheric lead emissions, which have not yet been reflected in oceanic surface waters. It may also be due, in part, to advective lead inputs from surface oceanic circulation of the South Equatorial Current. (C) 2001 Elsevier Science Ltd. All rights reserved.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 18/09/20 alle ore 19:46:17