prescribe_radiative_gas_concentrations values are not actually applied and are zero

[jimmielin]

What happened?

During investigation of a dycore read bug, claude-fable:5 flagged that

prescribe_radiative_gas_concentrations_init sets CFC11 from your prescribed_cfc11_vmr = 653.45e-12, and it runs at phys_init (cam_comp:286) — before the first phys_timestep_init → physics_read_data (cam_comp:375).

This means that physics_read_data clobbers the contents of prescribe_radiative_gas_concentrations_init.

This needs to be investigated as it implies that the CAM4 suite as-is in CAM-SIMA is broken.

What are the steps to reproduce the bug?

observe QPC4 regression test run log

 Constituent cfc12 default value not configured. Setting to min value of
  0.000000000000000E+000
 Constituent o3 default value not configured. Setting to min value of
  0.000000000000000E+000
 Constituent ch4 default value not configured. Setting to min value of
  0.000000000000000E+000
 Constituent o2 default value not configured. Setting to min value of
  0.000000000000000E+000
 Constituent n2o default value not configured. Setting to min value of
  0.000000000000000E+000
 Constituent cfc11 default value not configured. Setting to min value of
  0.000000000000000E+000
 Constituent co2 default value not configured. Setting to min value of
  0.000000000000000E+000

Golden moment from Claude:

What CAM-SIMA hash were you using?

sima0_16_000

What machine were you running CAM-SIMA on?

CISL machine (e.g. cheyenne)

What compiler were you using?

Intel

Path to a case directory, if applicable

/glade/derecho/scratch/hplin/aux_sima_intel_20260716081334/SMS_Ln9.mpasa120_mpasa120.QPC4.derecho_intel.cam-outfrq_analy_ic_cam4.GC.aux_sima_intel_20260716081334/run

Will you be addressing this bug yourself?

Yes

Extra info

No response