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Strange Stripes in MPAS Output

MattW

Member
Hi MPAS Folks,

I've noticed some strange stripes in the near-surface fields of a recent MPAS simulation I ran, and I was wondering if any of you have seen something similar before? They show up in the 2m temperature, soil temperature, 10 m wind, and skin temperature fields, but I haven't seen them in the lowest model level temperature field or any field above the ground, which makes me think they're related to land surface conditions. However, I haven't been able to find them in the static or init files I used to run this simulation so far. I've attached an image of the skin temperature from this experiment--the stripes show up most clearly near the Rio Grande, but are present in much of the rest of the image.

Thanks,

Matt 1755030295876.png
 
Matt,

Would you please give me more information on your case:

(1) Is this a global or regional MPAS run? Which version of MPAS are you running?

(2) What is the input data for this case?

(3) Please upload your namelist and stream files for me to take a look.

(4) if you run this case in derecho, please tell me where the case is located.

Thanks.
 
Sure!

1) This is a regional simulation in a 1 km domain covering most of TX. It uses v8.3 of MPAS (although it is the NOAA-GSL branch, I'll also be asking them about the stripes but I figured I'd also ask here in case you'd seen the problem as well).

2) The input data for this case was from the 00 UTC HRRR on 4 July 2025.

3) / 4) I ran this case in /glade/derecho/scratch/mawilson/mpas_tests/TX_floods. I just ran a CONUS-scale simulation in this directory as well on a 3 km grid (which was how I found this error, I just used output from the 1 km run as an example because the stripes show up better) using basically the same namelists (only the dates, timestep, and domain change), so the namelist.atmosphere and streams.atmosphere files in that directory should also reproduce the error. I've uploaded those files here.
 

Attachments

  • namelist (1).atmosphere.txt
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  • streams (1).atmosphere.txt
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Hi Matt,

In your namelist.atmopshere, you set config_physics_suite = 'hrrrv5'. Would you please clarify what physics schemes are used in this suite?

In addition, I found that you set "config_len_disp = 3000.0". For your case with the finest mesh of 1km, please set "config_len_disp = 1000.0"

The time interval for radiation calculation is 15min, which is way too large for the 1km run. Would you please change them to 1 or 3 min, i.e.,

config_radtlw_interval = '00:3:00'

config_radtsw_interval = '00:3:00'

Would you please change the above options, especially the config_len_disp, then try again?

Please let me know whether the strip feature is removed in your new run. Also, please keep me updated if you have any feedback from GSL.

Thanks.
 
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