Modeling of Suspended Particulate Matter during Early-winter Severe Pollution Episodes. (II): Model Description and the Preliminary Results of Simulation.:Model Description and the Preliminary Results of Simulation

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概要

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• A three-dimensional urban aerosol model was developed that predicts concentrations of major components of Suspended Particulate Matter (SPM), including nitrate, chloride, sulfate, ammonium, elemental carbon (EC), organic carbon (OC), and water. The model utilizes the outputs of a meso-scale meteorological model off-line, and runs a dispersion model that includes emission, chemical reaction, and dry-deposition processes. The chemical reaction sub-model adopted the CBM-IV photochemical reaction scheme, and forms NH<SUB>4</SUB>NO<SUB>3</SUB> and NH<SUB>4</SUB>Cl aerosols by gas-aerosol equilibrium assuming that they exist in the external mixture state. Sulfate is formed only in the gas-phase reaction of SO<SUB>2</SUB> with OH radicals; aqueous-phase reaction is neglected. Secondary formed OC is expressed by a simple parameterization based on an analysis of observed/computed OC concentrations and ambient non-methane hydrocarbon concentration. The model was applied to simulate atmospheric conditions of an extremely severe SPM pollution episode during the December 23-25, 1994, when intensive measurements of SPM were conduced. The model reasonably predicted the concentrations of each component at the evaluation sites located in the central part of the Kanto Plain, except for chloride. At evaluation sites in suburbs or country side, the model predicted concentrations were significantly low compared to those measured, which suggested further improvements of emission source models and dispersion models are required.

• 社団法人 大気環境学会の論文

社団法人 大気環境学会 | 論文

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