Table of Contents - The Atmospheric Studies Group at TRC

Section 1: Introduction
technical options, and meteorological variables such as the mean wind speed. Because each puff is
treated independently, any factor which influences the number and residence time of puffs on the
computational grid, and the model sampling time step will affect the run time of the model. As an
example of the range of runtimes, an annual simulation of CALPUFF in ISC-mode for 2 sources and 64
receptors required less than one minute on a 500 MHz PC. A visibility application involving 218 sources
and 425 receptors for an annual period required approximately 9 hours of runtime for CALMET and 95
hours for CALPUFF.
Program Execution
CALPUFF (Version 4.0 and above) can be executed with the following DOS command line:
CALPUFF filename
where it is assumed that the executable file is called CALPUFF.EXE and the "filename" is the name of
the file (up to 70 characters in length) containing all of the input information for the run. The default
input file name is CALPUFF.INP. The first input group in CALPUFF.INP contains all of the other input
and output (I/O) filenames used in the run. Within this group the user can change the name of any of the
input and output files from their default names, and change the directory from which the files will be
accessed by specifying the file's full pathname.
Similarly, CALMET (Version 3.0 and above) can be executed with the following DOS command line:
CALMET filename
where the default input filename is CALMET.INP, and the executable file is assumed to be called
CALMET.EXE.
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