HYSPLIT Forum: hysplitbbs.arl.noaa.gov

Dear all, I used HYSPLIT (concentration dispersion component) to run a particle dispersal simulation for 25 hours. I then checked the vertical mass distribution in the message file. After the 24th hour of the simulation, the proportion of the mass at each height level to the total mass remained in t...

Dear alicec,

Thank you very much for your reply. I really appreciate your help. It does make sense to me now. Thanks.


Kind Regards,

Ming

Thank you very much for your help, alicec.

I am not clear about the sentence below. Could you please rephrase it? Your help would be much appreciated. Thanks.

'Met data output is valid for the point at which it is output.'

Dear alicec, Thank you very much for your reply. I attempt to specify a value for the deposition velocity, rather than calculating it from the particle diameter and density. From what I understand, for particle dispersion, if a dry deposition velocity is specified, then that value is used as the par...

Dear all, I would just like to confirm somethings on dry deposition. Question 1: Is the parameter (deposition velocity) in HYSPLIT actually settling velocity in dry deposition due to gravity? Question 2: Is deposition velocity applied to all particles at any time for dry deposition during simulation...

Dear Fantine, Thank you very much for your reply. I am sorry that I did not describe Question 2 well. I was asking whether the lat/long coordinate represents the centre of a grid cell or the corner of a grid cell (e.g. the top left). For example, each conc grid cell (output file from HYSPLIT runs) i...

Dear alicec, Thank you very much for your help. I will look at these papers and get back to you later. I have another two questions now. I use NCEP/NCAR Global Reanalysis Data to run HYSPLIT. Question 1: Do I have to set ‘starting time (year, month, day, hour)’ as the UTC time in HYSPLT, regardless ...

Dear all, I am using HYSPLIT to model insect dispersal including dry deposition. Insects are not a perfect sphere. I am not sure how to set ‘Diameter (µm)’, and ‘Shape’. I guess that ‘Diameter (µm)’ refers to the diameter of the cross section (a circle) of a particle. If so, would I be able to use t...

Dear alicec,

Thank you very much for your help. I really appreciated it. Thanks.


Kind Regards,

Ming

Dear alicec, Thank you very much for your help. As you suggested, it works. I would be able to get the exactly same number of deposited particles between the output file (the number of deposited particles) and the MESSAGE file (the number of deposited particles = total released particles - the numbe...