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3.3.5 Adjusting the Emission Rate Units for Output

     The default emission rate units for the ISC models are grams per second for point and volume sources, and grams per second per square meter for area sources.  By default, the models convert these input units to output units of micrograms per cubic meter for concentration calculations and grams per square meter for deposition calculations.  This is accomplished by applying a default emission rate unit factor of 1.0E06 for concentration and 3600 for deposition.  The deposition factor essentially converts the emission rate to grams per hour for total deposition calculations.  For the Long Term model, an additional factor is applied for deposition calculations to adjust the emissions for the number of hours in the STAR data period.  This is done automatically by the ISCLT model, which allows the user to use the same set of source parameter inputs whether the model is calculating concentration or deposition in either model.

     The EMISUNIT keyword on the SO pathway allows the user to specify a different unit conversion factor, and to specify the appropriate label for the output units for either concentration or deposition calculations.  The syntax and type of the EMISUNIT keyword are summarized below:

Syntax:

SO EMISUNIT  Emifac  Emilbl  Conlbl (or Deplbl)

Type:

Optional, Non‑repeatable

 

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