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Table of Contents - The Atmospheric Studies Group at TRC

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Section 10: POSTPROCESSORS<br />

10.4 CALPOST<br />

<strong>The</strong> CALPOST program is a postprocessor designed to average and report concentr<strong>at</strong>ion or wet/dry<br />

deposition flux results based on the d<strong>at</strong>a contained in the CALPUFF output file. If the CALPUFF<br />

applic<strong>at</strong>ion had been configured to provide concentr<strong>at</strong>ions needed to assess visibility, CALPOST can also<br />

compute extinction coefficients for visibility-rel<strong>at</strong>ed impacts. A range <strong>of</strong> averaging times may be<br />

selected, and the results may be reported in a number <strong>of</strong> different form<strong>at</strong>s (e.g. rank tables and plots;<br />

exceedance tables and plots). Capabilities and options include:<br />

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User-selected processing period.<br />

User-selected averaging times, including option for one defined by the user.<br />

User-selected chemical species.<br />

User-selected units for reporting concentr<strong>at</strong>ions or deposition fluxes.<br />

Option to include gridded receptors, discrete receptors, and complex terrain receptors in any<br />

combin<strong>at</strong>ion.<br />

Option to specify subsets <strong>of</strong> the gridded and discrete receptors.<br />

Option to report results by receptor rings.<br />

Option to produce tables <strong>of</strong> the "top-50" average concentr<strong>at</strong>ion/deposition flux d<strong>at</strong>a (includes time<br />

and receptor inform<strong>at</strong>ion) for specified averaging times.<br />

Option to produce tables <strong>of</strong> up to four "top-N" (user specifies the number N) ranked average<br />

concentr<strong>at</strong>ion/deposition flux d<strong>at</strong>a <strong>at</strong> the selected receptors for specified averaging times.<br />

Option to produce tables <strong>of</strong> the number <strong>of</strong> exceedances <strong>of</strong> user-specified threshold values <strong>at</strong> the<br />

selected receptors for specified averaging times.<br />

Option to produce a table <strong>of</strong> the annual (or length-<strong>of</strong>-run) average concentr<strong>at</strong>ion/deposition flux <strong>at</strong><br />

the selected receptors.<br />

Option to print concentr<strong>at</strong>ion/deposition flux averages for selected days.<br />

Option to produce a file <strong>of</strong> timeseries <strong>of</strong> concentr<strong>at</strong>ion/deposition flux averages for selected days.<br />

Option to produce files <strong>of</strong> timeseries <strong>of</strong> the peak concentr<strong>at</strong>ion/deposition flux average over all<br />

selected receptors for each selected averaging period. Each output file contains one averaging<br />

period.<br />

Option to produce plot-files in addition to the selected tables for the top-N concentr<strong>at</strong>ions or<br />

deposition fluxes, the number <strong>of</strong> exceedances <strong>of</strong> the user-specified thresholds, and the<br />

concentr<strong>at</strong>ion/deposition flux fields for a particular day.<br />

Option to scale all concentr<strong>at</strong>ion/deposition flux d<strong>at</strong>a by means <strong>of</strong> a linear function <strong>of</strong> the form:<br />

a*X + b (where X is concentr<strong>at</strong>ion or deposition, and a,b are user-supplied constants).<br />

Option to add an hourly background concentr<strong>at</strong>ion/deposition flux from an external file.<br />

Option to produce visibility parameters, signaled by setting the species name to "VISB". Requires<br />

th<strong>at</strong> CALPUFF is configured for visibility comput<strong>at</strong>ions.<br />

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