There are two concentration display programs associated with the most
recent PC version of Hysplit, each treats the display size differently.
Wincplot - the screen display program. This program always plots the
entire domain of the concentration grid, regardless of the size of the
plume. To reduce the map size you need to reduce the concentration grid
span. From the concentration setup widget, go to "Pollutant, Deposition,
Grids Setup", then to "Grids", and then under the "Span" entry change the
latitude, longitude span of the grid to cover a smaller area.
Concplot - the postscript display program. This program automatically
scales the size of the map to keep the map the same over all time periods.
To have a finer scale map that corresponds to only one time period you
should output only that one time period. You can also run the program
from the command line (a DOS window) and set the size argument on the
command line to 1. Execute concplot without arguments to get the argument
list. There are no options through the GUI to modify the command line.
You can modify the tcl script that calls concplot to add any of the
optional arguments.