## Trajectory / Special Runs / Daily

This special menu can be used for either trajectory or concentration simulations to run automated multiple simulations for one month. The script will replace the starting day and hour in the CONTROL file with values generated in the script from the menu shown below. In this example the model will be run four times a day (at 0, 6, 12, and 18 UTC) for each day from 1 through 31. Note that the start-hour field is just treated as a string and can be replaced with any sequence of starting hours. The model output files are named according to the fields set in the control file and namelist file menus, but are appended with the four digit day and hour field. This approach differs from a single simulation with multiple starting times in that each simulation is independent and a new output file is created for each run.

The model should be configured and run for the first simulation time through the standard run menu to insure that the simulation is configured correctly. If part of the simulation requires meteorological data from the previous month or the next month, these should be included in the base simulation test.

At first it will appear that after pressing the Execute Script button that nothing is happening. However, as each day's simulation is completed, the Start Day entry box increases in value until its value matches the End Day, at which time the script is completed. Note that concentration simulations are much slower than trajectories and it may take a while before the start day field is updated.

The dispersion daily run menu contains an additional entry shown below that determines how the file name is calculated for each run. The default approach is the same as with the trajectory calculation, where the day and hour is appended to the base name. Another option is to name the files sequentially using a three digit number. Using sequential numbering, the output files can be processed by the probability display programs used in conjunction with the ensemble calculation.

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