Table 2 lists the recommended default boundary values for the
chemical species used in the model. Use of default boundary
values under regional transport conditions should be closely
evaluated. When using default values, the boundary of the
domain should extend as far upwind as practicable.
To diminish dependence on arbitrary specification of initial
conditions, a simulation should begin at least 1 day prior to
the primary day.
Use of regional model concentration predictions - Output from
regional-scale models such as the EPA ROM provides estimates of
initial and boundary conditions (as well as certain meteorological
inputs) for urban-scale models. This is especially important under
regional transport conditions. The ROM-UAM Interface System
referred to in Section 3.5.1 can use ROM concentration predictions
to develop UAM input files of initial and boundary conditions.
This interfacing software should be used for UAM domains nested
within more extensive ROM domains. Using the ROM is the
recommended approach for generating boundary conditions. It is the
most technically defensible approach for estimating future boundary
conditions for the attainment year.
Certain considerations arise when using interfacing methods.
First, selection of historical episodes is limited to those that
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