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The application of Eulerian models for air quality prediction and the evaluation of emission control strategies in Canada

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The Canadian Hemispheric and Regional Ozone and NOx System (CHRONOS) has been designed for the prediction of atmospheric oxidants on both regional and hemispheric scales. The model simulates dispersion and complex chemistry of nitrogen oxides and volatile organic compounds (VOCs) using inventories of actual anthropogenic emission. The meteorological input for the model is provided by the Mesoscale Community Model (MC2) and the Global Environmental Model (GEM), the latter being the operational model at the Canadian Meteorological Center. In this paper, the model formulation, as well as a description of the numerical methods employed, are presented. The theoretical section is followed by an illustration of the model application for air quality forecasts at the Canadian Meteorological Center and for the evaluation of emission control strategies in Canada.

Keywords: atmospheric ozone, emission control, forecasting, numerical methods, tropospheric chemistry

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