Modeling of the Effects of Gaseous and Particulate Pollutants in the Urban Atmosphere. Part II: Pollutant Dispersion

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Abstract
In conjunction with a companion study, this paper discusses the pollutant dispersion as predicted by solving numerically the equations of a transient, one-dimensional transport model. The results show that while the radiative properties of the aerosols have only a slight effect on the daytime pollution concentration; they do lead to decreased instability during the day. The gaseous pollutants, however, play a major role by lifting the elevated stable region thereby reducing pollution buildup. This alteration of an elevated stable region is important since air pollution episodes usually occur when such elevated inversions are present. Abstract In conjunction with a companion study, this paper discusses the pollutant dispersion as predicted by solving numerically the equations of a transient, one-dimensional transport model. The results show that while the radiative properties of the aerosols have only a slight effect on the daytime pollution concentration; they do lead to decreased instability during the day. The gaseous pollutants, however, play a major role by lifting the elevated stable region thereby reducing pollution buildup. This alteration of an elevated stable region is important since air pollution episodes usually occur when such elevated inversions are present.

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