HYSPLIT Forum: hysplitbbs.arl.noaa.gov

Hi there,

Please help me on defining the heat that a particle have at the time of emission in Hysplit. I have seen this option in emission file and i have given the different heat in watts corresponding to the temperature of particle at the time of emission. But, that really doesn't make any differences in concentration dispersion.

Secondly, Is this EMITIMES matters only for dispersion model. not for trajectory ?? or is there any option to define the initial temperature/ heat of particles, especially in case of ground based cloud seeding opportunities.

Thanks in advance.

The EMITIMES file is only for dispersion runs.

Using a nonzero value in the heat field causes the model to simulate plume rise due to buoyancy.
This may or may not affect downwind dispersion much depending on meteorological conditions and so forth.
https://ready.arl.noaa.gov/hysplitusersguide/S417.htm

Things to check:

Make sure that you have the EMITIMES file name specified correctly in your SETUP.CFG file.

Make sure that the model is using the EMITIMES file by looking at the MESSAGE file produced after a run.
If it is using the EMITIMES you should see a few lines in the MESSAGE file as follows:

NOTICE advrng: (kg ,xyr,xy1) - 1 20 20 9 80
NOTICE main: Initial time step (min) 3
NOTICE emsmat: opened emission file - EMITIMES.txt
NOTICE emsmat: emissions updated - 2008 8 8 4
NOTICE parout: 8 8 8 4 0 Num= 6576
NOTICE main: 1 57119283 6576 5.00032566E-02
NOTICE main: 1 57119286 13152 0.10000344
NOTICE main: 1 57119289 19728 0.15000895
NOTICE main: 1 57119292 26304 0.20002061
NOTICE main: 1 57119295 32880 0.25003228
NOTICE main: 1 57119298 39456 0.30003169
NOTICE main: 1 57119301 46032 0.35003102


If you are still having trouble or have further questions please attach your EMITIMES file, CONTROL file and SETUP.CFG file
that you are using for the run.

Thank you. All the checks you mentioned was done. Now i will try with better surface parameterization to my wrf simulations.