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Titolo:
Atmospheric depositional fluxes of trace elements, Pb-210, and Be-7 to theSargasso Sea
Autore:
Kim, G; Alleman, LY; Church, TM;
Indirizzi:
Univ Delaware, Coll Marine Studies, Newark, DE 19716 USA Univ Delaware Newark DE USA 19716 ll Marine Studies, Newark, DE 19716 USA
Titolo Testata:
GLOBAL BIOGEOCHEMICAL CYCLES
fascicolo: 4, volume: 13, anno: 1999,
pagine: 1183 - 1192
SICI:
0886-6236(199912)13:4<1183:ADFOTE>2.0.ZU;2-C
Fonte:
ISI
Lingua:
ENG
Soggetto:
NORTH-ATLANTIC OCEAN; WET DEPOSITION; METALS; MANGANESE; INPUTS; PRECIPITATION; TROPOSPHERE; ALUMINUM; BERMUDA; COAST;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Physical, Chemical & Earth Sciences
Citazioni:
33
Recensione:
Indirizzi per estratti:
Indirizzo: Kim, G Florida State Univ, Dept Oceanog, Tallahassee, FL 32306 USA FloridaState Univ Tallahassee FL USA 32306 lahassee, FL 32306 USA
Citazione:
G. Kim et al., "Atmospheric depositional fluxes of trace elements, Pb-210, and Be-7 to theSargasso Sea", GLOBAL BIOG, 13(4), 1999, pp. 1183-1192

Abstract

Atmospheric wet and bulk depositional fluxes of trace elements (Fe, Al, Mn, Zn, Pb, Cu, Cd, Ni, and Cr), Pb-210, and Be-7 (bulk only) to the SargassoSea were measured at Bermuda from September 1996 to September 1997. Wet deposition was the dominant process of trace element deposition over most of the sampling seasons, based on the measured bulk versus wet depositional fluxes. Although about half of the Mn in Bermuda precipitation was calculatedto originate from noncrustal sources, its seasonal trend is similar to theFe and Al, suggesting primary sources from continental crustal materials. On the other hand, Cd, Zn, Pb, Cu, Ni, and Cr in Bermuda precipitation originate mainly from noncrustal sources (presumably anthropogenic) based on enrichment factor analyses. The noncrustal sources were highest during the fall-winter due to more frequent intrusion of U.S. continental air as the Bermuda High weakens. Atmospheric depositional fluxes of Pb-210 showed a good correlation with the Be-7 fluxes (r(2)=0.84) at Bermuda, indicating major transport of Pb-210 via the upper troposphere from continents, along with other trace elements. Annual depositional fluxes of noncrustal elements (Cd, Zn, Pb, Cu, Ni, and Cr) at Bermuda were a factor of 2 to 3 lower than thoseat the mid-Atlantic Eight and were about 2-20 fold lower during the sampling year than those during the early 1980s. This confirms the rapid evolution of trace element inputs to the upper Sargasso Sea during the last few decades resulting from industrial emission controls in the surrounding continents.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 30/11/20 alle ore 19:41:33