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SENSITIVITY OF THE UAM TO BOUNDARY CONDITIONS
Citation:
Sistla, G., N. Zhou, W. Hao, S.T. Rao, K. Schere, AND K. Alapaty. SENSITIVITY OF THE UAM TO BOUNDARY CONDITIONS. U.S. Environmental Protection Agency, Washington, D.C., EPA/600/A-95/149 (NTIS PB96139167).
Description:
To comply with the 1990 Clean Air Act Amendments, grid-based photochemical models such as the Urban Airshed Model (UAM) are being used in developing emission control policies to alleviate the ozone non-attainment problem. any of these regulatory applications are often limited to a one-way nesting scheme in which the UAM is embedded into a regional-scale model to define the initial and boundary conditions for the UAM. revious applications of the UAM in the northeastern U.S. were limited to examining the effect of boundary concentrations on the predicted ozone concentrations in the interior of the UAM domain (Sistla et al, 1991, Georgopoulos, 1995). ecently, Alapaty et al, (1995) applied the Regional Oxidant Model (ROM) to assess the impact of diagnostic (DMET) and prognostic (PMET) meteorological fields on the ROM-predicted ozone and precursor levels. hey found that the precursor concentrations were generally higher under PMET conditions than under DMET. n this study, we examine the uncertainties in the UAM-predicted ozone concentrations arising from uncertainties in the specification of boundary concentrations of ozone and its precursors from the ROM using PMET and DMET simulations for two high ozone episodes over the New York Airshed.
