Short Term Model Options.

     The ISC Short Term model uses hourly meteorological data as one of the basic model inputs.  The user has several options for specifying the format of the meteorological data using the INPUTFIL keyword.  The syntax and type of this keyword are summarized below:



ME INPUTFIL  Metfil  (Format)


Mandatory, 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, or will assume the current directory if only the filename is given.  The optional Format parameter specifies the format of the meteorological data file.  The user has the following five options for specifying the Format:


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


2)   Specify the Fortran READ format for an ASCII sequential hourly file;


3)   Use free‑formatted READs for an ASCII sequential hourly file, by inputting the secondary keyword of FREE;


4)   Use unformatted file generated by the PCRAMMET or MPRM preprocessors, by inputting the secondary keyword of UNFORM; or


5)   Use "card image" data using a default ASCII format by specifying the secondary keyword of CARD ‑ this option differs from option 1) by the addition of hourly wind profile exponents and hourly vertical potential temperature gradients in the input file.


Since the deposition algorithms require additional meteorological variables, the exact format of ASCII meteorological data will depend on whether the dry and/or wet deposition algorithms are being used.  If the deposition algorithms are being used, then the unfomatted data file (option 4 above) cannot be used. 

     A related keyword, BOUNDELV, is used to define terrain elevations for the receptor locations identified with the BOUNDARY keyword.  The BOUNDELV keyword defines the terrain elevations in meters (or feet if the RE ELEVUNIT or CO ELEVUNIT FEET card appears) for each of the 36 boundary receptor points.  The syntax and type for this keyword are summarized below:


RE BOUNDELV  Srcid  Zelev(i),i=1,36


Optional, Repeatable

      The purpose of the BOUNDARY and BOUNDELV keywords is to provide a short‑cut for inputting the discrete polar receptors for the plant boundary.  There is no corresponding keyword for inputting boundary receptor flagpole heights.  The easiest way to input boundary receptors with flagpole receptor heights is to define them as discrete polar receptors using the DISCPOLR keyword.  This method provides better assurance that the flagpole heights are associated with the correct receptor, and makes it easier to check and debug the input file.  For applications where a uniform flagpole receptor height is used for all receptors, which can be specified as a parameter on the CO FLAGPOLE input card, those flagpole receptor heights will also apply to any boundary receptors identified through the BOUNDARY keyword.


     The MEeteorology pathway contains keywords that define the input meteorological data for a particular model run.  Because of differences in the meteorological data needs for the Short Term and Long Term models, some of the ME pathway inputs are different between the two models.  These differences are highlighted in the discussions below.  An effort has been made to keep the inputs as similar as possible between the Short Term and Long Term models.

3.5.1 Specifying the Input Data File and Format

     The input meteorological data filename and format are identified by the INPUTFIL keyword on the ME pathway.  The syntax of this keyword is very similar between the Short Term and Long Term models, but there are some differences due to the different formats of data available for the two types of models.  Therefore the Short Term and Long Term model inputs are described separately.


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