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Titolo:
RADON DAUGHTER DISEQUILIBRIA AND LEAD SYSTEMATICS IN THE WESTERN NORTH-ATLANTIC
Autore:
HUSSAIN N; CHURCH TM; VERON AJ; LARSON RE;
Indirizzi:
UNIV DELAWARE,COLL MARINE STUDIES NEWARK DE 19716 USN,RES LAB WASHINGTON DC 20375
Titolo Testata:
JOURNAL OF GEOPHYSICAL RESEARCH-ATMOSPHERES
fascicolo: D13, volume: 103, anno: 1998,
pagine: 16059 - 16071
Fonte:
ISI
Lingua:
ENG
Soggetto:
ISOTOPIC COMPOSITIONS; SURFACE MICROLAYER; VERTICAL PROFILE; PB-210; PO-210; PACIFIC; AIR; ATMOSPHERE; OCEAN; PRECIPITATION;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Science Citation Index Expanded
Science Citation Index Expanded
Science Citation Index Expanded
Science Citation Index Expanded
Science Citation Index Expanded
Citazioni:
60
Recensione:
Indirizzi per estratti:
Citazione:
N. Hussain et al., "RADON DAUGHTER DISEQUILIBRIA AND LEAD SYSTEMATICS IN THE WESTERN NORTH-ATLANTIC", J GEO RES-A, 103(D13), 1998, pp. 16059-16071

Abstract

Concentrations of Rn-222 and (210)pb Were measured in the North Atlantic troposphere in 1989 between April 12 and 28, during the Sulfide Experiment (SEX) Cruise I, and those of Rn-222, Pb-210 and Po-210, between October 24 and November 9, during the SEX Cruise II. Concentrationsof Pb-210 and Po-210 were also measured in the rain water, surface seawater, and marine microlayer collected during the SEX Cruise II. Other data used and published previously include stable lead and its isotopes [Veron et al., 1992; 1993] on parallel samples. Low R-222, contents, Of the order of 0.1 and 0.3 Bq m(-3), were found in the marine air:while continental air showed nearly 10 times higher concentrations ofRn-222. These results corroborate with the air mass trajectory analyses and continental signatures of stable lead isotopes. Significant correlation is found between Rn-222 and Pb-210 on the aerosol: indicativeof excess continental Rn-222 Supporting the in growth of Pb-210 from the atmosphere, in spite of its first-order removal by precipitation. Correlation between Pb-210 and stable Pb on the aerosol and in the precipitation document the source of pollutant lead from the continental surface. Mean residence times of marine aerosol based on Pb-210 is estimated to be 5.4 +/- 1.8 days during the April cruise and 19.7+/-1.9 days during the October cruise. Corresponding deposition velocity for Pb-210 is estimated to be 1.9+/-1.9 cm s(-1)? a value that suggests thedominant role of precipitation scavenging, or aerosol scavenging by larger host phases such as dust or sea salt. Excess Po-210 activities are found on the aerosol relative to what would be expected based on Pb-210 and the aerosol residence times. In surface seawaters, deficiencies of?Po-210 are observed. Mechanisms of Po-210 enrichment in atmospheric aerosol may include enrichments from the organic components of marine microlayer, sea-salt aerosol, dust, or air-sea exchange of volatile organo-polonium species.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 24/11/20 alle ore 14:13:55