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CHARACTERIZATION OF NITROGEN OXIDE FLUXES FROM SOIL OF A FALLOW FIELD IN THE CENTRAL
 

Summary: Pergamon
CHARACTERIZATION OF NITROGEN OXIDE FLUXES FROM
SOIL OF A FALLOW FIELD IN THE CENTRAL
PIEDMONT OF NORTH CAROLINA
DFLIG-SOO KIM. VINEV P. ANEJA* and WAYNE P. RoBARGEt
Department of Marine, Earth and Atmospheric Sciences,North Carolina State University, Raleigh, NC
276954208. U.S.A.
(Firsl rrcri& 5 May 1993and in final form 31 Ocroher 1993)
Abstract-- NO, emissionsfrom soils may contribute to the formation of 0, in rural areas,especiallywhen
there is substantial emissions of natural hydrocarbons from surrounding vegetation, such as in the
southeasternUnited States.Soil NO, flux measurementsweremade from 6 June 1992to 7 July 1992in 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, on rural atmospheric
photochemistry. The overall averageNO and NO1 emission rates, using a dynamic chamber technique,
were found to be 1.79+ 1.37ng-N rn-`~-~ (range: 0.13 to 6.67ng-Nm-`s-l) and - 1.07fO.87 ng-
Nm-`se' (range: -6.71 to 3.16ng-Nmm2s-`), respectively.Over 85% of the NO* 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 betweenNO concentration near
the soil surface(-5Ocm) and NO flux (r=0.35). The NO compensation point (I.12 ppbv) was estimated
from the relationship betweenNO emission rate and ambient NO concentrations measuredat 10 m. Both

  

Source: Aneja, Viney P. - Department of Marine, Earth and Atmospheric Sciences, North Carolina State University

 

Collections: Environmental Sciences and Ecology; Geosciences