The primary intent of the work has been the assessment of the combined effects of turbulent diffusion and inhomogeneous chemistry on the dispersion and chemical alteration of reactive pollutants and natural constituents of the lower atmosphere. The fundamental chemical kinetic equations for an inhomogeneously mixed binary reaction system are derived exactly and solved for various initial conditions in order to assess the effects of inhomogeneous mixing on chemical reaction rates. These effects are shown to be highly significant in several atmospheric chemistry situations, particularly when the reactants emanate from multiple sources. An approximate second-order closure of the chemical sub-model is then developed and coupled with the second-order (invariant) turbulent diffusion model. Initial calculations of the interaction of turbulent diffusion and chemical reactions are presented, including a simulation of a multiple freeway situation. Conditions under which chemical reactions are diffusion and mixedness limited are illustrated.

EPA project officer: Kenneth L. Calder. Prepared by Aeronautical Research Associates of Princeton, Inc. "March 1973." Interim report. "Meteorology Laboratory, National Environmental Research Center." Includes bibliographical references. "EPA-R4-73-016c."