HYSPLIT Forum: hysplitbbs.arl.noaa.gov

I'm not sure I understand your question. Here is some more information on this option from the user guide. https://www.ready.noaa.gov/hysplitusersguide/S625.htm KDEF defines the way the horizontal turbulence is computed. The default approach is to compute the horizontal mixing in proportion to the v...

Can you give us more information about what it is doing?
Can you do Trajectory/ quick start / Run Example and get a plot?

Have you tried some of the suggestions in Section 3.2? You may have ftp access restricted on your end.

I assume you talking about the difference in the trajectory calculation vs. the center of mass trajectory calculation shown in section in Section 7.6 number 3. One of the big reasons they can be different is because of wind shear - the variation of wind speed and direction with height. Dispersion wi...

The computational particles in HYSPLIT represent fluid parcels. The Lagrangian framework for fluid dynamics uses a frame of reference from the viewpoint of fluid parcels. HYSPLIT is very accurate for a gas as long as it is not a dense gas - that is as long as it will follow the flow of the rest of t...

"Open the trajectory setup menu and enter three starting locations, all at 600 m AGL: 38N 84W, 44N 74W, and 39N 83W. The first two points represent the lower left and upper right corner of the domain over which trajectories will be started. The difference between the first point and the third point ...

If mixing layer height is provided in the meteorological file then you can use the profile program which can be accessed by Meteorology/display data/text profile. This was covered a little in section 4.3. If you want to look at mixing height calculated a different way then you can use the vmixing pr...

Please see the HYSPLIT user guide and tutorial for information on how to
setup a HYSPLIT simulation including how to input your emissions.

Tutorials
https://www.ready.noaa.gov/HYSPLIT_Tutorials.php

User guide
https://www.ready.noaa.gov/hysplitusersguide/

For a trajectory simulation you don't need as much information as for the dispersion runs.
However some people do output variables such as precip along the trajectory.

https://www.ready.noaa.gov/hysplitusersguide/S141.htm

Hello, Please provide more information. The graphics you have included are for different time periods. The first one says it is for 20:00 to 22:00 and the second one from 17:00 to 18:00. The 'combo_EMITIMES_onerec.txt' file looks like this YYYY MM DD HH DURATION(hhhh) RECORDS YYYY MM DD HH MM DURATI...