Dear Hysplit team,
I am working on a problem where particle size and density change with time. While I do not seek to create a new complex chemistry module, I am exploring the possibility to simply readjust the particle size and density at a given time step (switch from distribution 1 to distribution 2 while keeping track of the location of the 3D particle). Is that something possible? And where could I start?
I was thinking that it could perhaps be a modification of the ICHEM=2 option, but for more particle type?
Or simply start a new run from a PARDUMP file, with the possibility to change particle size and density in the next run?
Thank you for any ideas you may have.
Sebastien
Changing particle density and size during Concentration calculation
Re: Changing particle density and size during Concentration calculation
It sounds like you should be able to use the ichem=2 and the CHEMRATE.TXT file.
https://www.ready.noaa.gov/documents/Tu ... inear.html
You could define multiple pollutatants and then specify the conversion rates.
something like
1 2 1.0 1.0
2 3 1.0 1.0
3 4 1.0 1.0
start off with emitting only particle 1 and then would have conversion to particle 2 which would
then eventually convert to particle 3 which would then convert to particle 4.
If you are a python user, the following has a PARDUMP file reader which may be useful
for figuring out if HYSPLIT is doing what you think it is doing. It returns a Pandas DataFrame.
https://github.com/noaa-oar-arl/monetio
https://www.ready.noaa.gov/documents/Tu ... inear.html
You could define multiple pollutatants and then specify the conversion rates.
something like
1 2 1.0 1.0
2 3 1.0 1.0
3 4 1.0 1.0
start off with emitting only particle 1 and then would have conversion to particle 2 which would
then eventually convert to particle 3 which would then convert to particle 4.
If you are a python user, the following has a PARDUMP file reader which may be useful
for figuring out if HYSPLIT is doing what you think it is doing. It returns a Pandas DataFrame.
https://github.com/noaa-oar-arl/monetio