Initial HYSPLIT time step

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DanClayton
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Joined: August 10th, 2020, 2:36 pm
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Initial HYSPLIT time step

Post by DanClayton »

Are there any plans on reducing the minimum time step to allow for shorter distance calculations? One example of the usefulness applies to one of my applications below.

I am calculating air concentrations and ground depositions. Some of the released particles are fairly large in size (> 1 cm), so they should deposit very quickly. Even though I initialize them at low heights (<1 m) with a PARINIT file, they still travel over the first time step (1 min), spreading those particles over ~0.25 km (depending on the wind speed) and diluting the calculated ground deposition values. Having a smaller initial time step would reduce this effect.
alicec
Posts: 240
Joined: February 8th, 2016, 12:56 pm
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Re: Initial HYSPLIT time step

Post by alicec »

When a time step smaller than 1 minute is needed we would recommend use of the inline HYSPLIT.
https://www.arl.noaa.gov/hysplit/inline ... -coupling/
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