wheremibg is the background concentration and δVp is the
volume of plume in a grid cell with volumeδV . Currently,
gaseous species are treated with the PinG module; however,
an aerosol/particulate module is now being incorporated.
For consistency with the grid model, PinG applies the same
gas-phase chemical mechanisms and chemical solvers used
by the CCTM.
The CCTM/PinG model was applied on a domain
encompassing the greater Nashville, Tennessee region.
Model simulations were performed for selected case study
days from July 1995, which coincided with the Southern
Oxidant Study (SOS) field study program being conducted
in the greater Nashville area. In particular, five major point
sources exhibiting a range of NOx emission rates were
selected for the PinG treatment. Figure 5 compares PinG
modeled species concentrations to observed plume
concentrations obtained from a horizontal aircraft traverse
intercepting multiple point source plumes. These example
results are encouraging as PinG concentrations for O3, NOy,
and SO2 and others presented in Godowitch  are in
reasonable agreement with plume measurements for three
different point source plumes intercepted at different
downwind distances along the same flight track. Further
quantitative analyses from several case study days are
underway in order to provide an initial assessment of the
ability of PinG to replicate the photochemical behavior of
ozone and other pollutant species in point source plumes.
10. APPLICATION EXAMPLES OF CMAQ CTM
The current version of CMAQ is capable of studying a
variety of air quality problems such as tropospheric ozone,
fine particles, acid deposition, nutrients, and visibility
degradation for urban to regional scales. Here we present a
few application examples of CMAQ simulations for ozone
and PM air quality problems on urban/regional scales.
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