daily rawinsonde data; separate wind fields to represent

flow within and above the boundary layer; parameterization

of vertical dispersion in terms of micrometeorological

turbulence variables; parameterization of SO , to SO and 2 4


NO to NO conversion, including the chemical equilibrium X 3

of the HNO /NH /NH NO system; resistance modeling of dry 3 3 4 3

deposition, including options for source or surface

depletion; time- and space-varying wet removal; and a

computationally efficient puff sampling function...

One of the limitations of the model, with respect to the

calculation of pollutant concentrations in Class I areas, which

are frequently located in complex terrain areas, is the absence

of any complex terrain treatment either on the generation of

the meteorological fields or on the dispersion. The

shortcoming of the meteorological fields is overcome to the

extent that the meteorological observations, which are used to

generate the wind fields in the MESOPAC meteorological

processor, represent the influence of terrain. The lack of

influence of complex terrain on the dispersion is somewhat

obviated by the fact that at the downwind distances of the

receptors from the sources, envisioned by the use of this

model, the puff will generally be uniformly mixed throughout

the depth of the mixed layer. Therefore, in most applications,

it is not expected that these shortcomings will overwhelmingly

bias the results of this model.

3.2 Acid Rain Mountain Mesoscale Model (ARM3)

The following brief description of the ARM3 is taken from

the preface to the ARM3 users guide (Morris et al., 1988):

...The ARM3 model is a Lagrangian trajectory model

with simplified chemistry applied to the discrete

plume parcels...

The ARM3 model consists of mesoscale

meteorological modules and acid deposition/air



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