Abstract
This paper describes the structural components of the more rigorous grid-type regional O{sub 3} models and discusses some of the issues that have yet to be resolved to achieve credible regional-scale simulations. Chief among these issues are the questions of the magnitude and photochemical effects of regional-scale biogenic organic emissions, the mass transfer from the lower to upper boundary layer by cloud fluxes, the lack of determinism in regional-scale wind fields, and perhaps most critically, the proper description of the subgrid-scale chemical and physical processes within the enormous volume of a regional grid cell. Further theoretical research and field experiments will help provide the knowledge necessary to resolve these outstanding issues of regional-scale air quality modeling.
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