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.

Recommendations

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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