DEVELOPMENT AND APPLICATION OF A REACTIVE PLUME MODEL FOR MERCURY EMISSIONS

A reactive plume model that includes atmospheric chemical reactions of mercury was developed. The model simulates advective transport with t he mean wind flow; horizontal and vertical turbulent diffusion; gaspha se; aqueous-phase and particulate chemistry; cloud microphysics; wet d eposition and dry deposition. The model was applied to the simulation of clear sky, non-precipitating cloud and precipitating cloud scenario s. No significant mercury chemistry occurs in the absence of droplets. In clouds, Hg(II) is reduced to Hg(0) with more reduction taking plac e in precipitating clouds than in non-precipitating clouds.