Interaction Between Meteorological and Dispersion Models at Different Scales
A general understanding of the interface between meteorological and dispersion models is that the latter ones should assimilate the information coming from meteorological model with minor internal processing, mainly oriented at computation of some surrogate indices like stability parameters or mixing layer height. However, the situation is rarely that simple. The dispersion model (DM) as a client of the numerical weather prediction (NWP) meteorological model (MM) requires significantly higher spatial resolution that that of NWP and, possibly, it should also vary in space and time because concentrations of atmospheric pollutants are usually much more irregular than meteorological variables. This brings about the problems of multi-scale nested modelling, boundary conditions, agreement between the scales and several other issues sometimes referred as a downscaling problem and its influence on accuracy of the DM at various scales.
KeywordsHeat Flux Friction Velocity Dispersion Model Street Canyon Numerical Weather Prediction
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