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CALPUFF and Postprocessors

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F.4 Buoyant Area Source Emissions File With Arbitrarily Varying Emissions (BAEMARB.DAT)<br />

The BAEMARB.DAT file contains buoyant area source emissions data for sources with detailed,<br />

arbitrarily varying emissions parameters. This file can be generated from the output of the Forest<br />

Service's Emissions Production Model (EPM) using a reformatting <strong>and</strong> preprocessing program provided<br />

with <strong>CALPUFF</strong>. In the BAEMARB.DAT file, values for the source parameters <strong>and</strong> emission rates can be<br />

specified for each time step in the run. Plume rise is computed within the <strong>CALPUFF</strong> model for each<br />

source using the numerical plume rise algorithm.<br />

BAEMARB.DAT is a free-formatted ASCII data file (see Table F-20 for an example) consisting of four<br />

header records, followed by a set of data records containing source information. The time-invariant data<br />

records contain character source identifiers <strong>and</strong> units labels . The time varying emissions <strong>and</strong> source<br />

parameter data follow in subsequent records. One data record per source is required for each time period<br />

(e.g.,usually at hourly intervals).<br />

Multiple BAEMARB.DAT files may be provided if groups of sources possess very different timevariability.<br />

For example, group 1 may require hourly data records for the entire simulation period, while<br />

group 2 may produce emissions for only a few weeks during the simulation. Using a second file for<br />

group 2 is more economical to prepare because a single data record can be used to prescribe a long period<br />

with no (or constant) emissions. Each such file must cover the entire modeling period, no source may<br />

appear in more than one file, <strong>and</strong> the species list must be identical among these files.<br />

The data in the BAEMARB.DAT file are independent of the horizontal <strong>and</strong> vertical grid systems being<br />

used in the model. The horizontal coordinates are specified in terms of UTM or Lambert conformal<br />

coordinates. The vertical layers receiving the emissions of the source are based on the plume rise of the<br />

source computed internally by the model. However, the BAEMARB.DAT file does contain timedependent<br />

data specifying the emission parameters for a particular time period.<br />

NOTE: There are structural differences between the BAEMARB.DAT file accepted by the current<br />

version of <strong>CALPUFF</strong> <strong>and</strong> that accepted by earlier versions, so anyone familiar with the previous versions<br />

must be certain to review the contents of the next few pages! <strong>CALPUFF</strong> will test the variable VRS3<br />

contained in the header of BAEMARB.DAT to see that it identifies the correct version. If the file uses an<br />

older format, changing VRS3 to the correct value will disable this check, <strong>and</strong> the results of the <strong>CALPUFF</strong><br />

application may be in error. Do not use an “old” version of this data file unless you are certain that the<br />

format is correct.<br />

MAR 2006 – <strong>CALPUFF</strong><br />

F-128

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