CSIRO - ACCESS-NRI standup minutes

CMIP7 CMIP7 development
36

Meeting Minutes

Date: May 13, 2025
Chair and minutes: Chris Bull

Attendees:

@cbull
Ian
Rachel
Tilo
Jhan
Ian
Jemma
Martin
Pearse
Alex
Anton
Harshula
Manodeep
Micael

General Updates:

  • Jhan reported issues with Gadi and /g/data4, affecting project runs. Noted recent NCI email update.

Pre-Industrial Greenhouse Gases:
- Martin Dix reported that the pre-industrial forcings (greenhouse gases, volcanic and aerosol forcings) are sorted and are almost identical to CMIP6, with minor differences. They look almost the same as cmip6 (greenhouse gas ones), but we are now using the cmip7 ones. Ian: land cover not included? Martin: relying on Rachel. Rachel: 3.1.2 is out – Alex is working from this. Martin: Ozone is still not released.

Related GH issues:

4xCO2 run:

  • Ian: In terms of where to start.. Wary of the salinity issue using a 4xCO2 forcing. Going as late as possible? i.e. as close to equilibrium as possible. Martin: are there any other major changes planned? Ian: yes, wanting to do a land cover changes. Martin: sounds like it’s best to wait.
  • Tilo/Rachel: suggests doing it asap as it’s a preliminary test that we can re-do when the other changes have been added. Martin: next action will set that up.

Land Cover Changes:

  • Ian and Rachel discussed progress on updating land cover types, particularly for Australian vegetation.

  • The team is working on parameter values and configuration changes. Requires code change (almost ready) and config change. Alex: been some progress but some work to do.

  • Ian: Still working Australian specific land cover types. Ian: Rhaegar has created scripts for CMORlite ACCESS-ESM can be used by iLamb but thinks Rhaegar still needs to tweak it. Chris: Is there a GitHub issue on this? No. Chris will follow up with with Rhaegar and Romain.

Ocean and BGC Updates:

  • Pearse will try and have a look at BGC output by Friday. Haven’t looked in the last two weeks but did have a look after last field table change. Tilo: air-Sea flux of CO2 was around zero (around last 100 years), was looking better than what we had in esm1.5.
  • Anton mentioned ongoing issues with freshwater accumulation in sea ice in cice5.
  • Chris Bull highlighted the salinity trend Mediterranean issue discussed last week, with no new updates on proposed fixes.

Software and Build Updates:

  • Harshula mentioned Dougie’s work on adding CMake support for MOM5 builds. For esm1.6 cmake build will ultimately be used. Various build things need to be adjusted. 2/4 scenarios are reproduced.
  • Manodeep: performance profiling. Both of the codes (preindustrial / amip) are spending a lot of time in mpi. cice is mostly waiting in 90% mpi (expected). Currently have a divide by zero runtime error in pi config when using oneapi. Currently debugging with valgrind. Stay tuned.

Next Meeting: next Tuesday.