Set up historical+concentrations+CN configuration

[blimlim]

1. Summary:

What has changed?

This PR sets up the carbon-nitrogen only version of the historical+concentrations configuration. It uses a copy of the restart from the dev-preindustrial+concentrations+CN configuration, with the restart year reset to 1850. The 3D CO2 variables have also been reset to the CMIP7 value of 4.3189e-4 using the steps here: #141 (comment), this has no effect on this concentration driven configuration, but will allow for the restart to also be used in an equivalent emissions driven configuration.

Why was this done?
CN variants of each configuration are required

2. Issues Addressed:

• Create carbon nitrogen only configurations #495

3. Dependencies (e.g. on payu, or model)

This change requires changes to (note pull request(s) where relevant):

• workflow manager (payu):
• model deployment (ACCESS-ESM1.6):
• model component or library dependency:
• input workflow:

4. Ad-hoc Testing

What ad-hoc testing was done? How are you convinced this change is correct (plots are good)?

5. CI Testing

• !test repro has been run

6. Reproducibility

Is this reproducible with the previous commit? (If not, why not?)

• Yes
• No - !test repro commit has been run.

New restart and changing cable mode will change answers.

7. Performance

Has the model performance (say, throughput of model-years/wall-day) changed?

• Yes
• No
• N/A (if selected, please add a brief explanation why performance testing is not necessary for this PR)

This PR creates a new configuration, and won't impact the performance of existing configurations,

If yes, provide the numbers from your testing. Is the performance better or worse?

8. Manifests

Have you changed the executable, the input files and/or the restart files?

• Yes
• No

If yes, have you updated the manifests?

• Yes
• No

To update the manifests, run payu setup (in a cloned copy of your feature branch) with reproducibility tests turned off:

manifest:
  reproduce:
    exe: false
    input: false
    restart: false
runlog:
  enable: false

Then commit the newly created manifest files (under manifests/) only to the branch for this PR.

9. Documentation

Is the documentation updated?

• Yes
• N/A

10. Merge Strategy

• Merge commit
• Rebase and merge
• Squash

[blimlim]

!test repro commit

[github-actions]

❌ The Bitwise Reproducibility Check Failed ❌

When comparing:

• 495-historical+concentrations+CN (checksums created using commit fc20122), against
• dev-historical+concentrations+CN (checksums in commit b6687f7)

🔧 The new checksums will be committed to this PR, if they differ from what is on this branch.

Further information

The experiment can be found on Gadi at /scratch/tm70/repro-ci/experiments/access-esm1.6-configs/fc20122ce387004a6e6dc02803c61ae5b2bd847f, and the test results at https://github.com/ACCESS-NRI/access-esm1.6-configs/runs/64923701697.

The checksums generated by this !test command are found in the testing/checksum directory of https://github.com/ACCESS-NRI/access-esm1.6-configs/actions/runs/22422508959/artifacts/5664339819.

The checksums compared against are found here https://github.com/ACCESS-NRI/access-esm1.6-configs/tree/b6687f7d29e3e3270b05abdbc7123b6c53b2b405/testing/checksum

Test summary:
❌ test_repro_historical
✅ test_repro_determinism

[MartinDix]

OK