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Comparison of different schemes for diffusion parameterization based on AERMOD. |
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Abstract Based on framework of the US EPA regulatory air quality model (AERMOD), comparisons were conducted for four widely-used diffusion parameterization schemes, one based on micro-meteorological elements (AERMOD scheme), one based on turbulence observation (Tub-Obs scheme), one based on the Briggs′ formulae (Briggs scheme), and one adopted in the Chinese EPA guidelines (NEPA scheme). Difference in the surface concentration of air pollutant simulated under different atmospheric stability with the four schemes, respectively, was analyzed. In general, under unstable and neutral conditions, differences from the four schemes are relatively small. However, under stable condition, the AERMOD scheme tends to overestimate the concentrations compared with the Briggs and NEPA schemes. This is possibly because the AERMOD scheme cannot sufficiently recognize the contribution of local turbulence.
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Received: 25 March 2009
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