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     The missing data processing routines, that are included in the ISC Short Term model as a non‑regulatory option, allow the model to handle missing meteorological data in the processing of short term averages.  With this option selected, the model treats missing meteorological data in the same way as the calms processing routine, i.e., it sets the concentration (or deposition) values to zero for that hour, and calculates the short term averages according to EPA's calms policy.  Calms and missing values are tracked separately for the purpose of flagging the short term averages.  An average that includes a calm hour is flagged with a 'c', an average that includes a missing hour is flagged with an 'm', and an average that includes both calm and missing hours is flagged with a 'b'.  If missing meteorological data are encountered without the missing data processing option, then the model will continue to read through and check the meteorological data, but will not perform any dispersion calculations.

3.2.3 Averaging Time Options

     The averaging periods for both the Short Term and Long Term models are selected using the AVERTIME keyword.  Since the averaging period options are different between the Short Term and Long Term models, the syntax for the AVERTIME keyword is somewhat different.

 

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  APLICACIONES castellano: DIS CUS DES  RAD   english: DIS CUS DES RAD  

 

 português: DIS CUS DES RAD   italiano:   DIS CUS  DES RAD

 

français:  DIS CUS DES RAD