Add option to prescribe an invariant solar constant

[bogensch]

Adds option for prescribing an invariant solar constant (i.e. total solar irradiance at TOA). Used for idealized experiments such as Radiative Convective Equilibrium (RCE), which is a supported DPxx case. Sets a default value for the DPxx RCE case, which conforms to the value used in RCEMIP.

DIFFs are expected for ERS_P16_Ln22.ne30_ne30.FRCE-SCREAMv1-DP (the DPxx RCE test case), but should be BFB for all other tests.

[mergify]

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[github-actions]

PR Preview Action v1.4.8
🚀 Deployed preview to https://E3SM-Project.github.io/scream/pr-preview/pr-3112/
on branch gh-pages at 2024-11-19 21:23 UTC

[whannah1]

looks good!