Models Climatological Dispersion

Turner, D. B, Zimmerman, J. R., and Busse, A. D., An evaluation of some climatological dispersion models, in "Proceedings of the Third Meeting of the Expert Panel on Air Pollution Modeling." North Atlantic Treaty Organization Committee on the Challenges of Modem Society Pub. No. 14. Brussels, 1972. (National Technical Information Service PB 240-574.)... 

Additional tables are furnished for the other stability classes. Note that calms have been distributed among the directions. Such joint frequency data can be used directly in climatological models such as the Climatological Dispersion Model (CDM) (1). The CDM calculates seasonal or annual concentrations at each receptor by considering sources in each wind sector... 

Fig. 21-11. Contributions to the annual sulfur dioxide concentration from each direction at a receptor in New York by area sources (lines) and point sources (rectangles) for 1969 using the Climatological Dispersion Model,...

Busse, A. D., and Zimmerman, J. R., "User s Guide for the Climatological Dispersion Model." Environmental Monitoring Series EPA-R4-73-024. U.S. Environmental Protection Agency, Research Triangle Park, NC, 1973,... 

COM2 (Climatological Dispersion Model) is a climatological dispersion model tliat detennines long temr quasi-stable pollutant concentrations. 

Further tests and previous experiences in other geographic locations confirmed that minimum Kz is a relevant (and often neglected) parameter to model properly the dispersion during weak wind and very stable conditions. Unfortunately no general value for minimum Kz can be defined, while proper values depend on season and local climatology, as well as on numerical diffusion in the advection scheme. 

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