Table of Contents - The Atmospheric Studies Group at TRC

Section 1: Introduction
MASSBAL.DAT. MASSFLX.DAT reports the mass of selected species that cross into and out of regions
defined by the user in the file FLUXBDY.DAT. MASSBAL.DAT reports changes in the mass of all
modeled species throughout the modeling domain.
A sequence of ‘QA’ files is produced during the setup phase of a run. These are designed to allow a user
to make one or more maps displaying geographical aspects of the run, including the modeling domain,
terrain elevations, gridded land use, source locations, and receptor locations. Maps of this type convey
the key spatial relationships of the model application.
Computer Requirements
The memory management scheme used in CALMET and CALPUFF is designed to allow the maximum
array dimensions in the model to be easily adjusted to match the requirements of a particular application.
An external parameter file contains the maximum array size for all of the major arrays. A re-sizing of the
program can be accomplished by modifying the appropriate variable or variables in the parameter file and
re-compiling the program. All appropriate arrays in the model will be automatically re-sized by the
updated parameter values. For example, the maximum number of horizontal grid cells allowed in the
model, MXNX and MXNY, are two of the variables which can be adjusted within the parameter file.
However, no change to the parameter file is necessary if a particular application requires a smaller array
size than the maximum values specified in the parameter file.
The memory management scheme used in CALMET and CALPUFF is designed to allow the maximum
array dimensions in the model to be easily adjusted to match the requirements of a particular application.
An external parameter file contains the maximum array size for all of the major arrays. A re-sizing of the
program can be accomplished by modifying the appropriate variable or variables in the parameter file and
re-compiling the program. All appropriate arrays in the model will be automatically re-sized by the
updated parameter values. For example, the maximum number of horizontal grid cells allowed in the
model, MXNX and MXNY, are two of the variables which can be adjusted within the parameter file.
However, no change to the parameter file is necessary if a particular application requires a smaller array
size than the maximum values specified in the parameter file.
The memory required by CALPUFF will be a strong function of the specified maximum array dimensions
in the parameter file. However, as an example, CALPUFF required approximately 300 K bytes of
memory for a test run with a 10 x 10 horizontal grid, with 5 vertical layers, and a maximum number of
puffs of 100. This type of configuration may be suitable for ISC-mode simulations of a small number of
point sources. For more typical studies, memory requirements will typically be at least 32 megabytes,
with more required for simulations involving large numbers of sources.
The run time of CALPUFF will vary considerably depending on the model application. Variations of
factors of 10-100 are likely depending of the size of the domain, the number of sources, selection of
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