18.104.22.168 Short Term Model Options.
The syntax and type of the Short Term AVERTIME keyword are summarized below:
CO AVERTIME Time1 Time2 Time3 Time4 MONTH PERIOD
where the parameters Time1 . . . Time4 refer to the user‑specified short term averaging periods of 1, 2, 3, 4, 6, 8, 12, or 24 hours, the secondary keyword MONTH refers to monthly averages (for calendar months), the secondary keyword PERIOD refers to the average for the entire data period, and the secondary keyword ANNUAL refers to an annual average. Any of the short term averaging periods listed above may be selected for a given run, up to the maximum number of short term averages set in the computer code by the parameter NAVE. The initial values for NAVE are given in Sections 2.3 and 4.2.2. The monthly averages are treated as short term averages, and selection of the MONTH average counts toward the limit of NAVE. Since the monthly averages are treated as short term averages, the user can select appropriate output options, such as the second highest values by receptor, on the OUtput pathway. The user may specify either the PERIOD keyword or the ANNUAL keyword, but not both. For concentration calculations, the PERIOD and ANNUAL keywords produce the same results. They both may be used to calculate the annual average for a full year of meteorological data, or to calculate the period average for a period other than a year. For deposition calculations, the PERIOD keyword will provide a total deposition flux for the full period of meteorological data that is modeled in units of g/m2, including multiple-year data files, whereas the ANNUAL keyword will provide an annualized rate of the deposition flux in units of g/m2/yr. For meteorological periods of less than a year, the ANNUAL deposition rate is determined by dividing by the length of the period in years. For meteorological periods of longer than a year, the model will assume that full years of data are provided and divide by the number of years, rounded to the nearest whole number. The treatment of short term averages with multiple-year data files is comparable to their treatment when the CO MULTYEAR option is used (see Section 3.2.11).
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