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STUDY USING A THREE-DIMENSIONAL SMOG FORMATION MODEL UNDER CONDITIONS OF COMPLEX FLOW
Citation:
Wakamatsu, S., K. Schere, J. Shreffler, AND I. Uno. STUDY USING A THREE-DIMENSIONAL SMOG FORMATION MODEL UNDER CONDITIONS OF COMPLEX FLOW. U.S. Environmental Protection Agency, Washington, D.C., EPA/600/D-86/116.
Description:
To clarify the photochemical smog formation mechanisms under conditions of complex flow, the SAI Urban Airshed Model was evaluated using a 1981 field observed data base. In the Tokyo Metropolitan Area higher O3 concentrations are usually observed near the shore in the morning. As the sea breeze layer penetrates inland, this high concentration region travels with it, increasing in concentration with time. A nighttime radiation inversion which persists into the early morning prevents the dispersion of primary pollutants emitted from the big coastal industrial zones and the Tokyo Metropolitan Area. The effect is believed to accelerate the formation of secondary pollutants during the next day. The quantitative role and weight of the previous day's secondary pollutants, newly emitted pollutants, temporal variation of mixing height and three-dimensional wind field for the O3 formation mechanisms were investigated. The three-dimensional simulated results showed good quantitative agreement with the observed field data but underestimated the aircraft data.