It is recommended that the size of the horizontal grid cells
should not be greater than 5 x 5 km. Grid cell sizes coarser
than this should be justified and should, at a minimum,
address items 1-3 above. Smaller grid cell sizes are
encouraged because they allow more accurate gridding of area
and mobile sources. Additionally, emissions from major point
sources are better characterized by smaller grid cell sizes.
However, grid cell sizes smaller than 2 x 2 km are not
recommended because of potential model formulation
inconsistencies for those grid sizes.
3.4 Number of Vertical Layers
In specifying the number of vertical layers, issues analogous
to those raised for horizontal grid cell dimensions must be
addressed. Again, a compromise is generally needed between the
number of vertical layers and the adequacy of available data bases
and computer resources. It is important that sources with tall
stacks or sources having plumes with high buoyancy be assigned to
an appropriate altitude. Pollutants in elevated, buoyant, pointsource
plumes often have effective release heights in layers well
above the surface. Increased vertical resolution allows more
accurate representation of the vertical layer at which these
emissions interact with emissions occurring closer to the ground.
Also, increased vertical resolution minimizes dilution that may
result from placing emissions into artificially large vertical
layers. Finally, increased vertical resolution improves the
simulation of when and where plumes are mixed to ground level.
Simulation of the chemistry between individual plumes and the
environment can be greatly affected by how well the model simulates
mixing of these plumes with the ambient air.
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