dev-1pctCO2: new restart

[blimlim]

1. Summary:

What has changed?

This PR cherry picks the changes from #473 into the 1pctCO2 configuration, specifically:

• updates the restart to the latest dev-preindustrial+concentrations restart
• UM code and MOM namelist changes to allow starting from year 1.

Why was this done?

2. Issues Addressed:

• Configurations for February spinup #472
• Changing restart year to year 1 #449

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)?

Testing performed in #472

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.

Answers change due to the change in restart

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)

Restart change not expected to affect performance

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 Had Errors - Check https://github.com/ACCESS-NRI/access-esm1.6-configs/actions/runs/22332357323 ⚠️
❌ The Bitwise Reproducibility Check Failed ❌

When comparing:

• cherry_pick_from_pr473_into_dev-1pctCO2 (checksums created using commit 200a90b), against
• dev-1pctCO2 (checksums in commit d552960)

Further information

The experiment can be found on Gadi at /scratch/tm70/repro-ci/experiments/access-esm1.6-configs/200a90b89f5b9611739a22e10628f16117774718, and the test results at https://github.com/ACCESS-NRI/access-esm1.6-configs/runs/64617447183.

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/22332357323/artifacts/5627537193.

The checksums compared against are found here https://github.com/ACCESS-NRI/access-esm1.6-configs/tree/d55296078c81f3a5806ed3573aef10add1ffbb1a/testing/checksum

Test summary:
🔥 test_repro_historical
🔥 test_repro_determinism

[blimlim]

!test repro commit

[github-actions]

❌ The Bitwise Reproducibility Check Failed ❌

When comparing:

• cherry_pick_from_pr473_into_dev-1pctCO2 (checksums created using commit 38f1515), against
• dev-1pctCO2 (checksums in commit d552960)

🔧 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/38f151526ae3158845c842720f35afbc17db07fd, and the test results at https://github.com/ACCESS-NRI/access-esm1.6-configs/runs/64624061110.

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/22334430538/artifacts/5628321326.

The checksums compared against are found here https://github.com/ACCESS-NRI/access-esm1.6-configs/tree/d55296078c81f3a5806ed3573aef10add1ffbb1a/testing/checksum

Test summary:
❌ test_repro_historical
✅ test_repro_determinism

[blimlim]

CO2 mmr printed out in the first year: CO2 0.43621E-03, which equals 1.01* 4.3189e-04. It looks like there aren't any issues setting CLIM_FCG_YEARS(1,1)=0.

[MartinDix]

OK