`Comparison of onsite and NWS meteorology data sets based on varying nearby landuse,` presented at guideline on air quality models: next generation of models conference 2009

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Courtesy of Trinity Consultants

Abstract

For regulatory modeling conducted in the United States using AERMOD, the United StatesEnvironmental Protection Agency (EPA) recommends the use of onsite measurements whereavailable or in the absence of onsite data five years of reliable, quality assured, andrepresentative meteorological data from a nearby National Weather Service (NWS) station. Incases where both onsite and NWS data are available and determined to be representative, acomparison of meteorological data, processed using AERMET, for the two locations can yieldinsights regarding the relative influence of recorded meteorological parameters and surfacecharacteristics on meteorological variables calculated in AERMET. A comparison ofmeteorological parameters influencing AERMOD-predicted concentrations between ameteorological dataset using only NWS data and one incorporating onsite wind speed anddirection data is presented in this paper. For this analysis, mechanical mixing height is chosen asthe parameter of most interest due to its influence on predicted concentrations for ground-levelfugitive sources, particularly during stable, night time conditions. The relative influence of windspeed and surface roughness on mechanical mixing heights derived for the two datasets is alsoexamined.

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