By default, HYSPLIT analyzes the meteorological inputs to determine the appropriate internal vertical model levels so that there are sufficient levels to interpolate all the meteorological input levels to an internal level without skipping input data due to insufficient vertical resolution or insufficient number of data levels. Alternatively, users can define these vertical levels by providing an input file called ZSG_LEVS.IN in the working directory.
ZSG_LEVS.IN should be formatted as follows:An example ZSG_LEVS.IN with 19 vertical levels, the surface layer extending from the surface to the top of the second internal model level at 75m AGL, and a model top of 10360.0 m AGL is formatted as follows: