Comparative Analysis of Photochemical Reaction Models Based on the Smog Chamber Data

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Four chemical reaction models for photochemical smog, Atkinson et al. (ALW), Killus and Whitten (KW), McRae and Seinfeld (MS) and Penner and Walton (PW), are compared based on the smog chamber data. Data of single and seven-hydrocarbon (HC) mixtures in NOx-air systems performed in the Statewide Air Pollution Research Center and the National Institute for Environmental Studies have been used. In the comparison of chemical models with smog chamber data, the estimation of the chamber effects and the setting of photolysis rates are very important. In the present study, they are calculated by the method based on the results of recent works. The predicted result in the single HC experiments are sensitive to the selected chemical models and HC component. On the other hand, in the sex en-HC mixtures experiments, there are small differences in the maximum O3 concentration between the predicted results by the four models. Concerning the time of O3 maximum concentration, ALW and KW are superior to MS and PW. Among the four models, ALW is most superior against the O3 concentration under the condition of the HC composition in the present study. However, every models can predict the NO2 concentration equally well.
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