HYSPLIT Forum: hysplitbbs.arl.noaa.gov

When calculating the concentration, the concentration is fragmented in a specific area. Do you have any idea why this is happening? I used GDAS half degree data at NOAA archived.

thank you,
JinO
[attachment]
1. fragmentd concentration pictures.png
2. control file.txt
3. setup file.txt

Please try adding more particles and see if your results are sensitive to that parameter.

ariel.stein wrote: ↑

March 9th, 2018, 11:39 am

Please try adding more particles and see if your results are sensitive to that parameter.

I calculated the 'numpar' parameter from -2,500 to -5,000 and 10,000. 'Maxpar' parameter were changed from 300,000 to 600,000, but the same thing happened.

I found that this phenomenon is limited to ground level deposition results not between 0 to 100 meters.

[Refer to]
1. numpar2500_maxpar300000_grnd.png
2. numpar10000_maxpar600000_grnd.png
3. numpar10000_maxpar600000_0to100.png

- I suspected that this phenomenon was due to lack of geographic information in the geological data (GDAS data), but it is not accurate. In the MeteoInfo program, both the planetary boundary layer height and surface roughness were displayed.
- Other guesses were that this was due to the high altitude in the area. However, when checked in the MeteoInfo program,
In the sea, the planetary boundary layer was the same, but a "cracking phenomenon" appeared in the sea.

Is my guess right? Do you have any other ideas?