Table of Contents - The Atmospheric Studies Group at TRC

Section 10: POSTPROCESSORS
When CALPOST is directed to perform visibility calculations, most of the preceding options remain valid
and determine how the computed extinction coefficients are averaged and reported. Additional options
are provided to configure how the extinction coefficients are computed:
Option to select which modeled species (sulfate, nitrate, fine/coarse particulate matter) are included
in the extinction coefficient.
Option to include background extinction when forming ranked tabulations, top-50 tabulations, or
exceedance tabulations.
Option to specify the extinction efficiency for each modeled species.
User-selected method for obtaining the background extinction coefficients (non-speciated
extinction coefficient, monthly speciated extinction coefficients, measured hourly extinction
coefficients)
Whenever visibility processing is selected, the peak daily percent change in extinction and the
corresponding change in deciview are always tabulated and reported in addition to the tables and plotfiles
selected to characterize the extinction coefficient results.
Table 10-13 lists the default name of each input and output file associated with CALPOST. The plot-files
are named automatically, with the user able to specify a pathname and character string to make the file
names unique. The name and full path of each file (except one) is assigned in the control file. The
exception, the control filename itself, is assigned on the command line. For example, on a DOS system,
CALPOST d:\CALPUFF\CALPOST.INP
will execute the CALPOST code, and read the input and output filenames for the current run from the
control file CALPOST.INP in the directory d:\CALPUFF. If the control filename is not specified on the
command line, the default control filename (i.e., CALPOST.INP in the current working directory) will be
used. The total number of characters in the path and filename can be up to 70 characters.
The utility routine that delivers a command line argument is system dependent. The function that
provides the system clock time and system CPU time is also system or compiler-specific. All systemdependent
or compiler-specific routines in CALPOST are isolated into a file called DATETM.xxx, where
the file extension (.xxx) indicates the system for which the code is designed. For example, DATETM.HP
contains code for Hewlett-Packard Unix systems, DATETM.SUN is for Sun Unix systems,
DATETM.LAH is for Lahey FORTRAN-compiled PC-applications, and DATETM.MS is for
Microsoft FORTRAN-compiled PC applications. By appending the correct system-dependent
DATETM file onto the main CALPOST code, the code should run without any modifications.
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