Application of a meteorological and photochemical modeling system for simulation of regional-scale pollutant transport processes in the northeastern US
- Systems Applications International, San Rafael, CA (United States)
The Clean Air Act Amendments (CAAA) of 1990 designated the region consisting of all states northeast of the Washington, DC Consolidated Metropolitan Statistical Area (CMSA) as the Ozone Transport Region (OTR). The ozone nonattainment areas within this region include New York, New Jersey/Philadelphia, Baltimore/Washington, and New England. Most multiday episodes that occur within the OTR are of regional scale, and within each nonattainment area, exceedances of the federal ozone standard (120 ppb) result from the combined effects of local emissions and pollutant (ozone and ozone precursor) transport. The 1--11 July 1988 episode period was characterized by a strong high pressure system aloft, centered (for much of the period) south of the Great Lakes region. Subsidence and above-normal temperatures associated with this feature contributed to high ozone concentrations and exceedances of the federal ozone standard throughout much of the eastern US. Recirculation-transport of pollutants throughout the region contributed to the extent and severity of the episode. The combined application of the Systems Applications International Mesoscale Model (SAIMM) and the variable-grid Urban Airshed Model (UAM-V) for the 1--11 July 1988 ozone episode has improved their understanding of the regional-scale pollutant transport mechanisms operating within the northeastern US. These models have been applied as part of Phase 1 of the Modeling Ozone Cooperative (MOCA).
- OSTI ID:
- 422934
- Report Number(s):
- CONF-960127--
- Country of Publication:
- United States
- Language:
- English
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