*.ASC files (LANDUSE.ASC, ROUGLEN.ASC, TERRAIN.ASC) to use with *.gfs0p25 data

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djunior
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Joined: May 28th, 2019, 3:59 pm
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*.ASC files (LANDUSE.ASC, ROUGLEN.ASC, TERRAIN.ASC) to use with *.gfs0p25 data

Post by djunior » May 28th, 2019, 4:13 pm

I need to calculate trajectories using GFS quarter-degree archive.

The bdyfiles directory contains three text files that provide default values for landuse, terrain, and aerodynamic roughess. I found bdyfiles directory in the HYSPLIT installation, but only for GDAS1 and GDAS0p5

Is it possible to download bdyfiles for quarter-degree resolution?

Fantine
Posts: 77
Joined: November 8th, 2012, 3:41 pm

Re: *.ASC files (LANDUSE.ASC, ROUGLEN.ASC, TERRAIN.ASC) to use with *.gfs0p25 data

Post by Fantine » May 29th, 2019, 11:59 am

The GFS quarter-degree archive has terrain and roughness. So, HYSPLIT uses them when they are available in the met data instead of using those *.ASC files.
For calculating trajectories, the model does not require landuse and roughness length. They are for computing deposition.

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