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Titolo:
Excess Po-210 in the coastal atmosphere
Autore:
Kim, G; Hussain, N; 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:
TELLUS SERIES B-CHEMICAL AND PHYSICAL METEOROLOGY
fascicolo: 1, volume: 52, anno: 2000,
pagine: 74 - 80
SICI:
0280-6509(200002)52:1<74:EPITCA>2.0.ZU;2-2
Fonte:
ISI
Lingua:
ENG
Soggetto:
WESTERN NORTH-ATLANTIC; RESIDENCE TIMES; RADON DAUGHTERS; PB-210; TRANSPORT; BI-210; BE-7; SULFIDE; FLUXES; SEA;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Physical, Chemical & Earth Sciences
Citazioni:
29
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., "Excess Po-210 in the coastal atmosphere", TELLUS B, 52(1), 2000, pp. 74-80

Abstract

Many researchers have reported the widespread occurrence of excess Po-210 in the global atmosphere and suggested probable sources such as resuspension of top soils, stratospheric aerosols, sea spray of the surface micro-layer, volcanic emission, and bio-volatile Po-210 species from the productive ocean. We have observed excess Po-210 on aerosols in the coastal atmosphere of the Chesapeake and Delaware Bays. On-board measurements in the Chesapeake Bay atmosphere show that the increase of this excess Po-210 is dependent upon wind speed. Simultaneously measured activity ratios of Be-7/Pb-210 andPb-210/Rn-222 argue against either higher altitude air or continental soils as the source of this excess. We hypothesize that the excess Po-210 originates mainly from surface waters either by the sea-spray of the surface microlayer, or more likely, by gas exchange. We conclude gas exchange as the mechanism since the polonium excess increases linearly with wind speed over a threshold of 3 m s(-1) (mean) similar to other gases (i.e., CO2, SF6, andDMS). In addition, higher Po-210 excess with lower Rn-222 is observed in on-shore marine air at Lewes. DE This suggests sea-air exchange of volatile Po along with other bio-volatile species (i.e., DMS, DMSe, and MMHg) in thecoastal productive ocean during high wind speeds.

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Documento generato il 30/11/20 alle ore 19:39:18