Table of Contents - The Atmospheric Studies Group at TRC

Section 9: CALPUFF
9. CALPUFF
The CALPUFF model obtains information about sources, receptors, meteorological data, geophysical
data, and model control parameters from a series of input files. These files are listed in Table 1-4. A
sample of the main control file (CALPUFF.INP) containing the user-specified model options and switch
settings is shown in Table 9-2. The model creates several output files, which are listed in Table 1-6.
Detailed information on the structure and content of each of the input and output files is provided in this
section.
Tables 1-4 and 1-6 show the Fortran unit numbers associated with each file. These unit numbers are
specified in the parameter file (PARAMS.PUF). They can be easily modified to accommodate systemdependent
restrictions on allowable unit numbers. Any changes to variables in the parameter file are
automatically modified throughout the CALPUFF Fortran code. The code must be re-compiled for
changes in the parameter file to take effect, since the parameter values are set at the program compilation
stage rather than at program execution.
The name and full path of each CALPUFF file (except one) is assigned in the control file (CALPUFF.
INP). The exception, the control filename itself, is assigned on the command line. For example, on a
DOS system,
CALPUFF d:\CALPUFF\CALPUFF.INP
will execute the CALPUFF code (CALPUFF.EXE), and read the input and output filenames for the
current run from the file CALPUFF.INP in the directory d:\CALPUFF. If the control filename is not
specified on the command line, the default control filename (i.e., CALPUFF.INP in the current working
directory) will be used. The path and filename can be up to 70 characters long.
The utility routine that delivers a command line argument is system dependent. The function that
provides the system clock time and system CPU time are also system or compiler-specific. All systemdependent
or compiler-specific routines in CALPUFF 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-compiled PC-applications, and DATETM.MS is for Microsoft-compiled PC
applications. By appending the correct system-dependent DATETM file onto the main CALPUFF code,
the code should run without any modifications.
9.1 User Control File
The selection and control of CALPUFF options are determined by user-specified inputs contained in a file
called the control file. This file, which has the default name CALPUFF.INP, contains all of the
information necessary to define a model run (e.g., starting date, run length, grid specifications, technical
9-1