Exercise #16




  • Problem - In the previous example, a customized EMITIMES file was created with three 12-h emission time groups. Edit the file so that only one time group is defined for the 36-h emission period.

  • Hint - Start with the EMITIMES and CONTROL files that were created in the previous example and should still be found in /hysplit4/working directory.

  • Solution - After editing the EMITIMES and CONTROL files, simply rerun the model ..\exec\hycs_std and graphics display program ..\exec\parxplot -iPARDUMP -k1 -z80 from the command prompt. Although the particle plots look almost identical, the new single emission cycle simulation shows 6716 particles at the end while the previous three-cycle simulation showed 17157 particles. Why are there three times fewer particles in the single cycle simulation?