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Extension of atmospheric dispersion models to incorporate fast reversible reactions

Atmospheric Environment 11(2): 101-108

Extension of atmospheric dispersion models to incorporate fast reversible reactions

Atmospheric dispersion with simultaneous chemical reaction is important with many air pollutants. A method is presented for separating the chemical reaction calculations from the atmospheric dispersion calculations in a model where the chemistry can be represented by one or a series of stoichiometric reactions. When the chemical reactions are fast and reversible, the concentration of all chemical species can be calculated from a system of algebraic equations along with dispersion calculations for an inert species, rather than by the integration of differential equations. The conditions under which this separation is valid are discussed. Practical applications of this method include modeling the conversion of emitted NO to NO2 by reaction with ambient ozone, and modeling the reaction of emitted sulfuric acid with ambient ammonia.

Accession: 005432796

DOI: 10.1016/0004-6981(79)90118-5

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