and directions within the surface layer. Whereas, the method

used by the ARM3, above the first layer, is to use spatially

and temporally interpolated upper air data to perform its

calculations. Furthermore, the ARM3 interpolations of data are

not performed until after a uniform "first guess" wind field is

modified for the effects of terrain and the modified first

guess field is given higher priority in the interpolations in

areas more removed from observations. Therefore, the general

directional features of the flow fields between the respective

models' lowest levels are similar, since both make use of the

surface station data. However, with the six layer

representation of the atmosphere used in ARM3, the winds at

levels above the first level, and below the height of the

mixing depth, are quite different than those calculated by

MESOPUFF-II. The method for calculating winds above the mixed

layer, however, is similar between the two models in that both

use only spatially and temporally interpolated winds for their

respective calculations. The ARM3 still uses the modified

first guess field, but at higher levels there is generally much

more uniformity to the overall flow field. Mixing Height: Mixing heights are another parameter

which could potentially result in dramatically different

concentrations calculated by the two air quality models.

MESOPUFF-II and the ARM3 both calculate a mechanical mixing

depth for the nighttime hours and a mechanical and convective

mixing height during the daytime and use the greater of the two

as the mixing depth. The two models use similar, but somewhat

different, algorithms to calculate the mixing depth, which

yields different results.

The convective mixing depth algorithm in the MESOPUFF-II

meteorological processor assumes that during daylight hours,

solar radiation reaching the ground produces an upward flux of

sensible heat and the development of a well-mixed adiabatic



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