Aerosols in Models-3 Cmaq
نویسنده
چکیده
The aerosol module of the CMAQ is designed to be an efficient and economical depiction of aerosol dynamics in the atmosphere. The approach taken represents the particle size distribution as the superposition of three lognormal subdistributions, called modes. The processes of coagulation, particle growth by the addition of new mass, particle formation, etc. are included. Time stepping is done with analytical solution to the differential equations for the conservation of number and species mass conservation. The module considers both PM2.5 and PM10 and includes estimates of the primary emissions of elemental and organic carbon, dust and other species not further specified. Secondary species considered are sulfate, nitrate, ammonium, water and organic from precursors of anthropogenic and biogenic origin. Extinction of visible light by aerosols represented by two methods, a parametric approximation to Mie extinction and an empirical approach based upon field data. The algorithms describing cloud interactions are also included in this chapter. On assignment from the National Oceanic and Atmospheric Administration, U.S. Department of Commerce. Corresponding author address: Francis S. Binkowski, MD-80, Research Triangle Park, NC 27711. E-mail: [email protected]
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