CCPP Framework Meeting Minutes 2021 12 14

Agenda

CCPP Physics Code Mgmt Meeting
See slides 7 (workshop goals), 9 (workshop audience), and 10 (potential participation in the workshop organizing committee).
Ligia and Mike are trying to put together a DTC proposal shortly to make this happen.
The timeline for such a workshop was late 2022 or after.

Convenience units, etc (all triggered by https://github.com/ufs-community/ufs-weather-model/pull/907 and associated PRs)
- Best option would be to pass around the actual quantities and not functions of it
  - But if the function is used in many places, then this slows things down
  - Need to understand how widespread this situation is (is it just log(Pa) or are there more such cases, e.g. in chemistry)
  - We need to be able to support modified variables such as xyz_multiplied_by_timestep_abc, but this is not interoperable
  - Are these non-portable qualifiers in the dictionary?
  - Add information to section "Best practices" in the CCPP technical documentation to try to avoid using these non-portable variables and units, but don't make it a rule
- Current exampled in ccpp-physics: log(Pa) and Pa**kappa (Dom to check if we could pass the actual quantities instead
Is specific humidity the mass mixing ratio of vapor with respect to moist air or with respect to total mass (rule 5)?
- Correct would be w.r.t. total mass, but UFS / ccpp-physics are using it incorrectly as w.r.t. moist air
- AMS glossary says specific humidity is w.r.t. total mass, but there are other definitions in the literature
- Outlow use of specific humidity,m and always use mixing_ratio_of_vapor_wrt_xyz?
- Dom to discuss this with Moorthi and Fanglin (Moorthi on AL until the end of the year)

CCPP Framework wiki