Bad ozone data

[andythewxman]

Good afternoon. I am currently trying to run a 25km-5km-1km nest over an area that has complex topography. When I run the model, the CAM radiation scheme errors out after the first couple timesteps, with the message: "RADOZN: Bad ozone data: non-monotonicity suspected". I am not experiencing this issue over "less-complex" terrain. I have tried adjusting several of the namelist options, but have not found anything that works yet. Unfortunately, I am not able to share the namelist file here, but I was wondering if you had any ideas on what I can try. I did see that some users have commented out this line in the code (see line 9716, linked below). Could this be a viable solution or would you not recommend doing so? I appreciate any information you can provide.

WRF/phys/module_ra_cam.F · 9f346e3601a68def021fcbb82fc257ed173a7773 · coawstmodel / COAWST · GitLab

Coupled-Ocean-Atmosphere-Wave Sediment Transport Modeling System src code

code.usgs.gov

 

[Ming Chen]

Hi,
Inside the code "phys/module_ra_cam.F", I can find the folloiwng piece of code:

      do kk=kkstart,levsiz-1
         do i=1,ncol
            if (pin(kk).lt.pmid(i,k) .and. pmid(i,k).le.pin(kk+1)) then
               kupper(i) = kk
               kount = kount + 1
            end if
         end do

We expect that the pressure monotonically decreases with increasing height. However, when the model goes wrong for some reasons, the monotonicity will be violated. This will lead to the error in your case.