Abstract
A national inventory of soil nitric oxide (NO) emissions with county spatial resolution and monthly time resolution has been developed from empirical relationships that were derived from soil NO emissions data. The empirical relationships used to develop the inventory relate the emission of NO to soil temperature and a factor which is representative of an ecosystem or type of land use. Most of the ecosystem/land use factors were derived from analyses of NO emission data from seven different sites in the United States that are representative of three ecosystems and two agricultural land use types. Other agricultural (crop) land use factors were estimated from the two calculated factors based on differences in fertilization associated with the crops. This soil emission inventory exhibits three general features. First, croplands, especially where corn is grown, appear to be significant sources of NO. This has important implications because agricultural activities tend to be localized to certain regions in the United States (i.e., the Midwest) and are highest during the summer, when photochemistry is also most active. Second, undisturbed areas, such as grasslands, forests, and wetlands, do not appear to contribute substantially to atmospheric NO. Third, extensive areas in the western United States have not been included because soil NO emission data are lacking.
Highlights
Slemr and Seiler [1984], Anderson and Levine [1987], Williams et al [1988], Shepherdet al. [1991], and G
It is well known that the most intense sources have shownthat emissionsfrom highly fertilizedsoils can of N Ox are thoseof anthropogeniocrigin,principallythe approachemissionlevelsof urbanareaswhencomparedon a combustion-relatedactivities of energy productionand per unit areabasis.an exponentiadl ependenceof soil transportation[Logan, 1983]
These sources,are nitric oxide (NO) emissionsonsoiltemperaturoevertherange15ø-35øChas generallyconfinedto small geographicareasand can be beennoted that appearsto be reasonablyconsistentacross reasonablywell quantified.On theotherhand,naturalsources, many land usetypes [Williams and Fehsenfeld,1991]
Summary
Slemr and Seiler [1984], Anderson and Levine [1987], Williams et al [1988], Shepherdet al. [1991], and G. It is well known that the most intense sources have shownthat emissionsfrom highly fertilizedsoils can of N Ox are thoseof anthropogeniocrigin,principallythe approachemissionlevelsof urbanareaswhencomparedon a combustion-relatedactivities of energy productionand per unit areabasis.an exponentiadl ependenceof soil transportation[Logan, 1983] These sources,are NO emissionsonsoiltemperaturoevertherange15ø-35øChas generallyconfinedto small geographicareasand can be beennoted that appearsto be reasonablyconsistentacross reasonablywell quantified.On theotherhand,naturalsources, many land usetypes [Williams and Fehsenfeld,1991]. This principallylightning and emissionfrom soils, are more temperaturedependencea, pproximatelya factorof 2 increase widespreadand less intense which makesquantitative in flux per 10øincreasein soiltemperaturei,ndicatesthatNO estimationmuchmoredifficult.
Sign-in/Register to view highlights & summary 
Submitted Version (
Free)
Published Version
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
