Concentration / Setup Run

The initial setup menu for the concentration model is identical to the trajectory setup run menu in terms of starting time, location, and meteorology. These items will not be discussed again except to note the differences when applied to a dispersion simulation. The meaning of the entries in the CONTROL file that correspond to this setup menu are discussed in more detail below and should be reviewed to appreciate how the change in the simulation type (from trajectory to concentration) changes the meaning and context of the same input parameters. These parameters consist of the initial entries of the CONTROL file. The initial concentration setup menu is shown in the illustration below.

The entries in the Control file for air concentration simulations consist of four groups of input data. The first data group is almost identical to the trajectory simulation and is described in the next section. The other three groups define the pollutant emission characteristics, the concentration grid in terms of spacing and integration interval, and the pollutant characteristics relevant to computing deposition and removal processes. These latter three entries are accessed through the "Pollutant, Deposition, and Grids Setup" tab. Each of the these sections contains a more detailed description of the input parameters as well as the corresponding CONTROL file values that need to be set for command line simulations.

Initial CONTROL File Section

The concentration model input control file can be created using any text editor. However if the GUI is not being used, it would be easier to let the model create the initial file based upon standard output prompts. These are described in more detail below. When data entry is through the keyboard (a file named CONTROL is not found), a STARTUP file is created. This contains a copy of the input, and which later may be renamed to Control to permit direct editing and model execution without data entry. If you are unsure as to a value required in an input field, just enter the forward slash (/) character, and the indicated default value will be used. This default procedure is valid for all input fields except directory and file names. An automatic default selection procedure is also available for certain input fields of the CONTROL file when they are set to zero. Those options are discussed in more detail below. Each input line is numbered (only in this text) according to the order it appears in the file. A number in parenthesis after the line number indicates that there is an input loop and multiple entry lines may be required depending upon the value of the previous entry.

1- Enter starting time (year, month, day, hour, (minute, optional))

2- Number of starting locations

3(1)- Enter starting location (lat, lon, meters, Opt-4, Opt-5)

4- Enter total run time (hours)

5- Vertical motion option (0:data 1:isob 2:isen 3:dens 4:sigma 5:diverg 6:msl2agl 7:average 8:damped)

6- Top of model domain (internal coordinates m-agl)

7- Number of input data grids

8(1)- Meteorological data grid # 1 directory

9(2)- Meteorological data grid # 1 file name

Next Section of the CONTROL file

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