C224 adjoint tests in jelf

[tom-j-h]

PR Summary

Sci/Tech Reviewer: @mo-joshuacolclough
Code Reviewer: @jennyhickson

For testing operational TLM/adjoint configuration. There is also a test with solver settings that mean the solver runs closer to convergence, and another test initialised from a realistic increment rather than random data. A new lfric_atm task is added to generate this realistic increment, analogous to the existing C12 task. A script to convert the output of the lfric_atm task to a file suitable to use for the jedi_tlm_tests task is added, again analogous to the existing C12 task. I've put these files in the locations in my $DATADIR that you can see in the diff - but these will need to be added to BIG_DATA_DIR as part of this change.

• is blocked-by Adjoint test initialised from realistic increment in jelf #161
• blocks Linear and adjoint boundary layer physics #182
• closes C224 adjoint tests in jelf #126

PLEASE NOTE - this is a follow-on to #161. The branch was created from #161's branch in my fork, but I can't make a PR into that branch because then I would be stuck in my fork. So, to look at the actual changes relevant to this PR alone, look at the diff of this branch with #161's branch: tom-j-h/lfric_apps@jelf_real_increment_adjoint_test...tom-j-h:lfric_apps:jelf_C224_adjoint_tests

PLEASE ALSO NOTE - #161 is blocked by #156 which relies on MetOffice/lfric_core#227, so when testing, I used this Core branch.

Code Quality Checklist

• I have performed a self-review of my own code
• My code follows the project's style guidelines
• Comments have been included that aid understanding and enhance the readability of the code
• My changes generate no new warnings
• All automated checks in the CI pipeline have completed successfully

Testing

• I have tested this change locally, using the LFRic Core rose-stem suite
• If required (e.g. API changes) I have also run the LFRic Apps test suite using this branch
• If any tests fail (rose-stem or CI) the reason is understood and acceptable (e.g. kgo changes)
• I have added tests to cover new functionality as appropriate (e.g. system tests, unit tests, etc.)
• Any new tests have been assigned an appropriate amount of compute resource and have been allocated to an appropriate testing group (i.e. the developer tests are for jobs which use a small amount of compute resource and complete in a matter of minutes)

trac.log

Test Suite Results - lfric_apps - jelf_C224_adjoint_tests-developer/run1

Suite Information

Item	Value
Suite Name	jelf_C224_adjoint_tests-developer/run1
Suite User	tom.hill
Workflow Start	2026-01-22T11:33:44
Groups Run	developer

Dependency	Reference	Main Like
casim	MetOffice/[email protected]	True
jules	MetOffice/[email protected]	True
lfric_apps	tom-j-h/lfric_apps@tlad_boundary_layer	False
lfric_core	tom-j-h/lfric_core@2a67d6b	True
moci	MetOffice/[email protected]	True
SimSys_Scripts	MetOffice/[email protected]	True
socrates	MetOffice/[email protected]	True
socrates-spectral	MetOffice/[email protected]	True
ukca	MetOffice/[email protected]	True

Task Information

✅ succeeded tasks - 1112

Security Considerations

• I have reviewed my changes for potential security issues
• Sensitive data is properly handled (if applicable)
• Authentication and authorisation are properly implemented (if applicable)

Performance Impact

• Performance of the code has been considered and, if applicable, suitable performance measurements have been conducted

AI Assistance and Attribution

• Some of the content of this change has been produced with the assistance of Generative AI tool name (e.g., Met Office Github Copilot Enterprise, Github Copilot Personal, ChatGPT GPT-4, etc) and I have followed the Simulation Systems AI policy (including attribution labels)

Documentation

• Where appropriate I have updated documentation related to this change and confirmed that it builds correctly

PSyclone Approval

• If you have edited any PSyclone-related code (e.g. PSyKAl-lite, Kernel interface, optimisation scripts, LFRic data structure code) then please contact the TCD Team

Sci/Tech Review

• I understand this area of code and the changes being added
• The proposed changes correspond to the pull request description
• Documentation is sufficient (do documentation papers need updating)
• Sufficient testing has been completed

(Please alert the code reviewer via a tag when you have approved the SR)

Code Review

• All dependencies have been resolved
• Related Issues have been properly linked and addressed
• CLA compliance has been confirmed
• Code quality standards have been met
• Tests are adequate and have passed
• Documentation is complete and accurate
• Security considerations have been addressed
• Performance impact is acceptable

[ss421]

I can confirm that this does not impact JEDI testing so there is nothing further to do on that side.