where mibg is the background concentration and δVp is the

volume of plume in a grid cell with volume δV . 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 [110] 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.


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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