CCPP Framework Meeting Minutes 2022 02 15

Agenda

Chunxi Zhang (NOAA EMC) will be responsible for physics code management on the EMC side - welcome!

One outstanding pull request for CCPP framework (capgen, #434) adding unit/system tests for automated unit conversions

Ufuk and Dom made good progress on calling CCPP from the CMEPS mediator, related CCPP framework PR #439 is currently in draft mode
#419 (visualization of variable traversing through suite) is still work in progress, due in June 2022 (part of DTC's statement of work)
Reconsider meeting time with an increasing attendance from the East Coast

What are the required semantics?
- What operations are needed and when?
- Exploratory - no immediate requirement, but it comes up at more and more at meetings etc (e.g. 3D PBL development at NCAR). Will also be discussed at the CCPP visioning workshop
Two examples:
- 3D, but vertical grid is the same everywhere - just ignoring communication between the horizontal grid columns (pseudo 3D)
- Full 3D model: each column can have its own vertical coordinate
Definition of vertical coordinate? Same vertical coordinate means the same as defined (and modified) by the dynamical dycore
Requires constructing stencils (depends on what exactly is needed)
When it is needed (horizontal communication in the time integration = run phase)?
- If in the run phase, how can we implement this w/o impacting performance
- Have a dedicated 3d run group or communication between the groups etc.
We could prepare some options with pros and cons (for example in form of a white paper) to guide the discussion at the visioning workshop

CCPP Framework wiki