Abstract:
(Summary adapted from EPA.)
The UAM-V (Urban Airshed Model V) Model is a three-dimensional, multi-scale
photochemical grid model that calculates concentrations of pollutants by
simulating the physical and chemical processes in the atmosphere. The model is
the latest of the Urban Airshed Model (UAM) lineage, which was initiated in the
early 1970s and has undergone nearly continuous cycles of application,
performance evaluation, update, extension, and improvement. The basis for the
UAM is the atmospheric diffusion or species continuity equation. This equation
represents a mass balance that includes all of the relevant emissions,
transport, diffusion, chemical reactions, and removal processes in mathematical
terms. Because it accounts for spatial and temporal variations as well as
differences in the reactivity of emissions, the UAM is useful for evaluating
the air-quality effects of emission control scenarios. It does this by first
replicating a historical ozone episode to establish a base-case simulation.
Model inputs are prepared from observed meteorological, emission, and air
quality data for the episode days using prognostic meteorological modeling
and/or diagnostic and interpolative modeling techniques for the meteorological
fields and emissions models to prepare daily, hourly and location specific
emissions fields. The model is then applied with these inputs, and the results
are evaluated to determine its performance. Once the model results have been
evaluated and determined to perform within prescribed levels, the same
base-case meteorological inputs are combined with projected emission
inventories to simulate possible future emission scenarios.
http://www.epa.gov/scram001/7thconf/information/uamvdoc.pdf
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