CCPP Framework Meeting Minutes 2022 07 05

Agenda

Next steps in SIMA review, following the informational sessions, will be more workshop-like
Should the shared physics library (MPAS/WRF/CM1), which is ccpp-compliant, be included in the discussion?
Person to implement a CCPP physics suite and the framework in MPAS has left NCAR, no replacement so far

CCPP v6 release happened on June 29, 2022 - great team effort by DTC
Mike Ek now physics co-chair in ICAMS
On ccpp-physics side: moving towards an authoritative repository shared across all models, and forks for the different models with frequent synchronization
- NOAA-EMC: fork hosted at ufs-community; also useful for maintaining multiple branches (operational, pre-/post-operational)
- Need good strategy for testing etc.
- Also need to think about what happens if physics changes in fork require changes in framework
- Work is done on rules for creating forks of authoritative repositories to avoid divergence
PR https://github.com/NCAR/ccpp-framework/pull/452 (currently a draft) needs to be tested with UFS/SCM, if all works fine then get ready for merging (these changes are required for the IAP model to work, but are general bug fixes that should go in at some point)
Future ideas/wishlist: transform arrays, flip vertical dimension, GPU support, 3D physics, process-split vs time-split, output of tendencies vs update of state in place, ...
- capgen is well positioned to do variable manipulations (transform, flip, convert units and kinds) efficiently

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