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3.5.1.2 Long Term Model Options 

     The ISC Long Term model uses a standard STability ARray (STAR) meteorological data file in place of sequential hourly meteorological data used in the Short Term model.  The meteorological data in the STAR file consists of a joint frequency distribution of wind speed and wind direction by stability category.  The input of other variables to the Long Term model, (temperature, mixing height, and surface roughness (z0)) are controlled by separate ME pathway keywords described later in this section.  The Monin-Obukhov lenght (L) and friction velocity (u*) are calculated internally when needed for dry deposition modeling.

     The ISCLT model reads the STAR meteorological data from a separate data file.  The STAR data filename and format are specified following the INPUTFIL keyword.  The following syntax is used:

Syntax:

ME INPUTFIL  Metfil  (Format)

Type:

Optional, Non‑repeatable

where the Metfil parameter is a character field of up to 40 characters that identifies the filename for the meteorological data file.  For running the model on an IBM‑compatible PC, the Metfil parameter may include the complete DOS pathname for the file; the current directory is assumed if only the filename is given.  The optional FORMAT parameter specifies the format

for the STAR data.  The user has the following three options for specifying the Format:

1)   Use the default ASCII format for the STAR file (if Format is left blank);

2)   Specify the Fortran READ format for the ASCII STAR file; or

3)   Use free‑formatted READs for the ASCII STAR file, by inputting the secondary keyword of FREE.

     The default ASCII format corresponds to the format of the data files generated by EPA's STAR utility program for the ISCLT model.  Each record of STAR meteorological data consists of six values (default format of 6F10.0) corresponding to the six wind speed classes for a particular wind direction and stability category.  The program reads stability category A first, and the first record contains the six values for the north wind direction.  There are 16 cards for each stability category corresponding to the 16 wind direction categories entered clockwise from north (north, north‑northeast, etc.). This pattern is repeated for each of the six stability categories, A through F.

201 - 202 - 203 - 204 - 205 - 206 - 207 - 208 - 209 - 210 - 211 - 212 - 213 - 214 - 215 - 216 - 217 - 218 - 219 - 220 - 221 - 222 - 223 - 224 - 225 - 226 - 227 - 228 - 229 - 230 - 231 - 232 - 233 - 234 - 235 - 236 - 237 - 238 - 239 - 240 - 241 - 242 - 243 - 244 - 245 - 246 - 247 - 248 - 249 - 250

 

 

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