Abstract

The adaptation of the Community Multiscale Air Quality (CMAQ) modeling system to simulate O3, particulate matter, and related precursor distributions over the northern hemisphere is presented. Hemispheric simulations with CMAQ and the Weather Research and Forecasting (WRF) model are performed for the year 2006 using identical projections and grid configurations. The ability of the model to represent long-range transport of air pollutants is analyzed for selected cases through comparison with available surface, aloft and remotely sensed observations. These demonstrate the feasibility of extending the applicability of the CMAQ modeling system to hemispheric scales to provide a conceptual framework to examine interactions between atmospheric processes occurring at various spatial and temporal scales in a consistent manner.

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