FORMULATION OF A 2ND-GENERATION REACTIVE FLUME AND VISIBILITY MODEL

The formulation of a second-generation reactive plume and visibility m odel, the Reactive and Optics Model of Emissions (ROME), is presented. This model presents the following improvements over existing plume vi sibility models. Chemical transformations in the gas phase, aqueous ph ase, and particles are simulated by means of a comprehensive chemical kinetic mechanism. Aerosol dynamics is simulated using a sectional rep resentation of the aerosol size distribution. This approach allows an efficient treatment of radiative transfer calculations. Plume diffusio n is treated according to several options, including a second-order cl osure algorithm for instantaneous plume concentrations. ROME is applie d to a case study to illustrate the relative effects of NOx and primar y particulate emissions on plume visual appearance.