How to increase the trajectory output frequency?

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deejeek
Posts: 2
Joined: September 7th, 2021, 6:23 am
Registered HYSPLIT User: Yes

How to increase the trajectory output frequency?

Post by deejeek »

Dear HYSPLIT users,
I have been using the HYSPLIT off-line version to generate high-resolution trajectories using the WRF model outputs. The temporal resolution of my WRF output is 5 minutes. However the trajectories from the HYSPLIT comes only in hourly resolution. I would like to get the trajectories also with 5 minute resolution. It would be a great help if someone can suggest how to fix this.
Thanks in advance.

Deepak.
sonny.zinn
Posts: 354
Joined: May 8th, 2019, 1:31 pm
Registered HYSPLIT User: Yes

Re: How to increase the trajectory output frequency?

Post by sonny.zinn »

You might want to adjust the TOUT namelist variable. Please see https://www.ready.noaa.gov/hysplitusersguide/S410.htm for details.
deejeek
Posts: 2
Joined: September 7th, 2021, 6:23 am
Registered HYSPLIT User: Yes

Re: How to increase the trajectory output frequency?

Post by deejeek »

Thanks a lot for your response!
In my HYSLPIT working directory, I could not find the file "SETUP.CFG". But I found the namelist file TRAJ.CFG, where there is a similar entry 'tout' which is set to 60. However, when I change tout to any value other than 60, while running the model, it goes to the default value of 60! Do I need to create the SETUP.CFG file? Kindly suggest.

Thanks
alicec
Posts: 411
Joined: February 8th, 2016, 12:56 pm
Registered HYSPLIT User: Yes

Re: How to increase the trajectory output frequency?

Post by alicec »

Yes, you need to create a SETUP.CFG file.
You can do this by copying TRAJ.CFG to SETUP.CFG
The TRAJ.CFG is output by HYSPLIT but is not read in by HYSPLIT.
So when you change TRAJ.CFG, it is just being overwritten when HYSPLIT is run.
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