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F2000climo out-of-box run shows too large TOA imbalance?

sanya_n

Sanya
New Member
What version of the code are you using?
CESM2.2.0

Have you made any changes to files in the source tree?
No

Describe every step you took leading up to the problem:
Only made changes in user_nl_cam

Initially did a test run for 5 years with COSP on by adding this in the user_nl_cam file.
&cospsimulator_nl
docosp = .true.
cosp_amwg = .true.

To look at the TOA imbalance I ran it for 12 years more, switched COSP off again (to save on wallclock time)


Describe your problem or question:
Hello everyone, I ran a F2000climo out-of-the-box simulation with f09_f09_mg17 grid. I looked at the FSNT-FLNT (global) to see TOA imbalance (or rather TOM I think), but the values I'm getting seem too large and even show a slight increasing trend. I've looked at some other posts and made sure that I'm doing area-weighting for global means so I dont think that's the issue.
(avg = data.weighted(np.cos(np.radians(data.lat))).mean(dim=("lat","lon"))

The sfc temp seems to be okay and from literature I have seen that spin-up time for atmosphere-only run is quite short as well, so I dont know if such values are expected or not. Any help regarding this would be appreciated thanks!

Screenshot from 2026-02-04 18-06-38.png
 

stepheba

Ben Stephens
New Member
Hi Sanya,

COSP won't have any impact on the model's solution, since it just enables some additional diagnostics. So I think this is just the behavior of that version of CAM when it's run out of the box, and I've heard from a colleague here that ~4 W/m2 is about what they recall seeing with out of the box F2000climo too.
 
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