An Improved Gaussian Model for Long-Term Average Air Concentrations


Roland R. Draxler


Atmospheric Environment, Vol. 14, pp. 597-601, 1980


Abstract - A long-term sector average Gaussian dispersion model that incorporates temporal vertical stability variations, estimated wind speed at release height, a method to account for calm winds, and day-night mixing depths, is tested against 2 years of weekly average Kr-85 air concentrations collected at 13 locations from 30 to 150 km from a quasi-continuous source.  The root mean square error (RMSE) of ratios of observed to calculated concentrations was determined for the weekly to annual average values with the RMSE decreasing from 5 down to 2, respectively.  A sensitivity study of these four improvements indicated that the first three were the most significant.


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