Open lizziel opened 8 months ago
@lizziel - I advise you to have #484 go in as it currently stands. Any modifications (other than addressing reviewer comments) will slow the tag down completely. It is appropriate to open a a new PR with the additional mods that are wanted.
@cacraigucar, yes, I agree. Do you think it is feasible to target CESM3.0 for the version update and inclusion of Cloud-J? We have a GEOS-Chem conference in early June and it would be wonderful to announce its inclusion in CESM at the meeting.
@lizziel - I can't answer on the feasibility right now. Once the PR is open and we can see the scope of the changes we can give you a better answer. It would also need an approval from the NCAR ACOM group that they believe these changes should come in.
The PR accompanying this issue is now ready for review at https://github.com/ESCOMP/CAM/pull/1093. Since this issue was opened GEOS-Chem was brought into the cam_development branch. The new PR features GEOS-Chem 14.4 (originally I was aiming for 14.3 but enough time has passed that we have a newer version). It also include Cloud-J photolysis (new in 14.3) and HETP aerosol thermodynamics as an improvement upon ISORROPIA (new in 14.4).
What is the feature/what would you like to discuss?
I have an existing PR under review that brings GEOS-Chem chemistry into CAM as an alternative to CAM-Chem (https://github.com/ESCOMP/CAM/pull/484). That PR uses GEOS-Chem v14.1 released in February 2023. I am now working on GEOS-Chem v14.3 in CAM that can be merged in after my existing PR is merged. It is a relatively simple update, though still in progress. However, it requires an update to HEMCO and also brings in a new external, Cloud-J, that is a replacement for legacy Fast-JX previously hard-coded in GEOS-Chem to compute J-values. Besides use in GEOS-Chem, we are in discussion with NCAR about using Cloud-J as an option within CAM-Chem and including it in MUSICA.
I would like your feedback on order of bringing in these updates. In theory I could update my current PR to use 14.3 and include Cloud-J. However, it is so far along and near merge I am hesitant to change it. Plus we have published papers that use GEOS-Chem 14.1 in CESM and it would be nice to have a tag for that version. Assuming GEOS-Chem v14.3 and Cloud-J come in as a later PR I could either bundle them together or submit as separate PRs. Do you have a preference?
Ideally this would go into CESM3.0 if possible. There will be no changes in outputs except when running with GEOS-Chem chemistry.
Is there anyone in particular you want to be part of this conversation?
@cacraigucar @jimmielin
Will this change (regression test) answers?
I do not think there are changes in HEMCO that would affect results for non-GEOS-Chem runs. However, I would need to check on that.
Will you be implementing this enhancement yourself?
Yes