Previous applications of the UAM have generally used four or
five vertical layers, with two layers between the surface and the
morning mixing height (diffusion break in the UAM) and three layers
between the mixing height and the top of the modeling domain.
Sensitivity studies suggest that using fewer than three layers
above the mixing height may artificially dilute elevated pointsource
plumes, which may cause the model to underpredict nearsurface
ozone and precursor concentrations.
Users of the UAM should consider specifying greater detail for
the horizontal and vertical grid cell size than the minimum
recommended in this guidance document. This is encouraged
particularly in modeling domains containing complex terrain or
land/water interfaces. Wind field models can typically produce
wind fields for many more vertical layers than the minimum number
given here.3 The number of vertical layers considered in the UAM
is more likely to be constrained by the time-consuming calculations
needed to simulate atmospheric chemistry.
Based on previous model applications, it is recommended that
a minimum of five vertical layers be used in the modeling
study, with at least three layers above the morning mixing
height (diffusion break in the UAM). Additionally, it is
recommended that the top of the modeling domain (region top in
the UAM) be specified above the mixing height by at least the
depth of one upper-layer cell. This can be done by setting
the region top value equal to the maximum mixing depth plus
the minimum depth of the upper-layer cells.
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