Table of Contents - The Atmospheric Studies Group at TRC

Section 10: POSTPROCESSORS
10. POSTPROCESSORS
After making one or more CALPUFF simulations, concentrations and/or deposition fluxes for each
species at each receptor exist in several unformatted data files. A single CALPUFF application can
produce four such files: CONC.DAT (concentrations in g/m 3 ); WFLUX.DAT (wet deposition fluxes in
g/m 2 /s); DFLUX.DAT (dry deposition fluxes in g/m 2 /s); and VISB.DAT (relative humidity for visibility
analyses). When a period is simulated as a sequence of shorter-period CALPUFF applications, as when a
year is simulated in chunks of about four weeks, for example, each of the shorter runs produces its own
set of files. When certain groups of sources need to be characterized separately, individual CALPUFF
applications are required for each group, again producing a set of data files for each application.
Similarly, certain species may be modeled separately, producing more output data files. Data in all of
these files must be processed to obtain results that can be used to characterize air quality impacts in terms
of multiple-hour averages, increment consumption, threshold exceedences, visibility reduction, total
deposition, and so forth. Postprocessors designed for this work include:
APPEND
CALSUM
POSTUTIL
CALPOST
is a postprocessor which appends two or more sequential CALPUFF
concentration, wet flux, dry flux or relative humidity (visibility) files in time.
is a postprocessor which sums and scales concentrations or wet/dry fluxes from
two or more source groups from different CALPUFF runs.
is a postprocessor which operates on one or more CALPUFF concentration and
wet/dry flux files to create new species as weighted combinations of modeled
species; to sum wet and dry deposition fluxes; to merge species from different
runs into a single output file; to sum and scale results from different runs; to
repartition nitric acid/nitrate based on total available sulfate and ammonia; and
to add time/space-varying background.
is a postprocessor which operates on one CALPUFF concentration or wet/dry
deposition flux file to perform visibility calculations; to average and summarize
concentrations and deposition fluxes; to determine ranked
concentration/flux/light extinction values; and to create list files and plot files.
These postprocessors are described in the following sections.
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