CSIRO - ACCESS-NRI standup minutes

CMIP7 CMIP7 development
47

Meeting minutes (5/08/2025)

Participants:
@cbull
@clairecarouge

@micael
@anton
@inh599

@jemmajeffree

@manodeep

@paulleopardi
@RachelLaw
@rbeucher

@tiloz
@spencerwong
@tiloz
@Jhan
@alexnorton

@pearseb

@Aidan

Chair: @clairecarouge
Minutes: @cbull

Project Coordination and Workflow

  • Claire gave an overview of the proposed forward protocol for folding in everyone’s development threads. @jhan is confirmed as the runner for integrating changes.
  • Claire emphasized the importance of coordination between contributors, runners, and reviewers.

Experiment Management

  • Discussion on whether to start new experiments or continue existing ones when applying changes.
    • Anton and Chris highlighted the need for new experiments when restart files are modified.
    • Ian stressed the importance of maintaining an accurate spin-up table for tracking changes.
    • Mixed approaches have been used so far; flexibility remains depending on the nature of changes.

Status Updates

  • Anton: Order 1 items are ready to go; Anton confirmed a 50-year test was run over the weekend (to decide on lprec value).
    • @anton and @Jhan will have an offline meeting to coordinate getting all the order 1 items going.
  • Ian raised concerns about long-term cooling trends in the deep ocean.
    • Pearse suggested Antarctic Bottom Water dynamics may be contributing.
    • Tilo and Rachel discussed whether this is a spin-up issue or a deeper energy imbalance.
    • Further investigation is needed, but changes to sea ice and vegetation may help.
  • Ian: still trying to understand the long-term change in temperature. We’re nearly at 2000 years and for the last 500 years the deep ocean has been cooling. Pearse: Matt and Pearse think that the AABW upwelling is affecting tracers at mid-latitudes. This may have been driven by the changes we made in southern ocean fluxes (change of distribution of fresh water has changed southern ocean overturning). Pearse is wondering if we need even more spin up time for this problem might resolve itself? Tilo: thinks Ian is concerned that there is an energy imbalance issue not a spin up issue. Rachel: thinks CICE5 coming in is a priority and need to see what impact that has. Rachel has suggested if Ian thinks energy imbalance could be canopy related then latest veg distribution has some reduction in trees. Pearse views the impact on the BGC and global ocean metrics as minor.
  • Paul: still waiting on the ozone and nitrogen forcings. Current guidance is that it was due in July and they are still running simulations. See link.
  • Spencer: wanted to check if anyone had any follow up thoughts on the water balance issue. Do we want to try some of the UM changes or stick with what we have now? Ian: would be interested to see how the salinity is affected by the changes? But in general, would like to see the changes go in. Spencer: has done a 50 year run but didn’t see any major changes so will consider running it a bit longer.
  • Vegetation and Australian PFT updates are progressing.
    • Alex confirmed restart creation; awaiting system availability.

Scheduling and Prioritization

  • Chris Bull suggested swapping Spencer and Alex’s items with Manodeep’s if needed.
    • Manodeep noted oneAPI changes need a week of testing.
    • Decision: maintain current order but allow flexibility based on readiness.

Technical and CI Updates

  • Harshula asked for any Spack issues; none raised.
  • Ian reported no conversion failures in recent runs. Aidan commented that nothing has changed infrastructure wise during that time.