Abstract
Three-dimensional numerical model that can predict the wind field and pollutant concentration in meso-scale was applied over the Osaka Plain. The surface temperature and specific humidity is determined by solving the surface heat budget equation including the effect of a vegetation layer.The vertical coefficients of momentum, heat and specific humidity in the surface layer are given by Businger's universal function and above it are obtained by level 2 model of the turbulence closure proposed by Mellor and Yamada. Pollutant concentration is simulated with the effect of dry deposition and photochemical reaction. This photochemical reaction model includes 11 species and 18 chemical reactions. The model simulation was carried out for two days, which assumed that it is fine on summer. The calculation results were compared with the observation data.In the daytime when the sea breeze significantly develops, the calculation values of the wind speed, the wind direction and S02, NO2 and NO concentration agreed relatively well with the observation ones.In the nighttime, except for NO concentration there wasn't a great difference between calculations and observations.
