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Titolo:
CHARACTERIZATION OF NITROGEN-OXIDE FLUXES FROM SOIL OF A FALLOW FIELDIN THE CENTRAL PIEDMONT OF NORTH-CAROLINA
Autore:
KIM DS; ANEJA VP; ROBARGE WP;
Indirizzi:
N CAROLINA STATE UNIV,DEPT MARINE EARTH & ATMOSPHER SCI RALEIGH NC 27695 N CAROLINA STATE UNIV,DEPT MARINE EARTH & ATMOSPHER SCI RALEIGH NC 27695 N CAROLINA STATE UNIV,DEPT SOIL SCI RALEIGH NC 27695
Titolo Testata:
Atmospheric environment
fascicolo: 6, volume: 28, anno: 1994,
pagine: 1129 - 1137
SICI:
1352-2310(1994)28:6<1129:CONFFS>2.0.ZU;2-4
Fonte:
ISI
Lingua:
ENG
Soggetto:
NITRIC-OXIDE; NATURAL HYDROCARBONS; PEROXY-RADICALS; UNITED-STATES; EMISSIONS; NO; FOREST; SITE; TROPOSPHERE; SAVANNA;
Keywords:
NITROGEN OXIDES; NOX EMISSION; DYNAMIC CHAMBER; NO COMPENSATION POINT; WATER-FILLED PORE SPACE; SOIL TEMPERATURE;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Science Citation Index Expanded
Science Citation Index Expanded
Citazioni:
36
Recensione:
Indirizzi per estratti:
Citazione:
D.S. Kim et al., "CHARACTERIZATION OF NITROGEN-OXIDE FLUXES FROM SOIL OF A FALLOW FIELDIN THE CENTRAL PIEDMONT OF NORTH-CAROLINA", Atmospheric environment, 28(6), 1994, pp. 1129-1137

Abstract

NO(x) emissions from soils may contribute to the formation of O3 in rural areas, especially when there is substantial emissions of natural hydrocarbons from surrounding vegetation, such as in the southeastern United States. Soil NO(x) flux measurements were made from 6 June 1992to 7 July 1992 in the central Piedmont region of North Carolina (Southeast Oxidants and Nitrogen intensive Analysis site, SONIA) in an effort to determine the role of natural emissions of NO(x) on rural atmospheric photochemistry. The overall average NO and NO2 emission rates, using a dynamic chamber technique, were found to be 1.79 +/- 1.37 ng-N m-2s-1 (range: 0.13 to 6.67 ng-N m-2s-1) and -1.07+/-0.87 ng-N m-2s-1 (range: -6.71 to 3.16 ng-N m-2s-1), respectively. Over 85% of the NO2 flux measurements were negative indicating net deposition to the soil surface. No negative NO flux rates were observed. NO flux was correlated with soil temperature. There was a positive correlation between NO concentration near the soil surface (approximately 50 cm) and NO flux (r = 0.35). The NO compensation point (1.12 ppbv) was estimated from the relationship between NO emission rate and ambient NO concentrationsmeasured at 10 m. Both positive and negative vertical gradients of NOconcentration between 10 m and soil surface were detected. The positive vertical gradients are indicative of NO transport to the site from polluted air masses. A significant negative correlation between NO flux and ambient O3 concentration (r=0.66), however, supports the hypothesis that soil emissions of NO contribute to local production Of O3 in rural areas.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 06/04/20 alle ore 12:04:30