CSIRO - ACCESS-NRI standup minutes

CMIP7 CMIP7 development
38

Meeting minutes

Date: 03 June 2025
Chair and Minutes: Claire Carouge
Participants:
Claire Carouge, Chris, Rachel, Anton, Jhan, Dave Bi, Romain, Pearse, Martin Dix, Harshula, Manodeep, Lachlan, Aidan, Micael, Alex, Dougie, Spencer, Ezhil

Actions from last meeting

Table of proposed changes

  • Chris has created the table.
  • Rachel has organised the information as “science” changes that will change the results and “technical” changes that will not change the results.
  • Discussion on the science changes priorities at NESP meeting tomorrow. Anyone who wants to attend is welcome to contact Rachel for the meeting details.

CMT=0 option

  • It will be discussed in details at the NESP meeting.
  • Rachel found there isn’t much difference for climate simulations between the 3 options when used consistently.
  • A Met Office report supports this finding.

CICE5

  • Anton has completed 110-year run, aiming for 200 years.
  • Dave’s analysis shows:
    • Good strong overturning circulation in the Antarctic as well as stable ACC transport, close to observation. The ACC transport is much better than in CM2.
    • Sea-ice extent is comparable to ESM1.5 and 1.6 (with CICE4) and reasonable. Still showing too much ice in the northern hemisphere.
    • Better ENSO period.
    • All checks show the performance is as good as before or better. See GitHub issue for details.
    • Dave to add Jhan’s spinup results to his comparisons.

Mediterranean salinity issue

  • Ezhil is looking at the Sicily strait. Testing a simulation with a deepen strait.
  • Will test a wider strait afterwards if required.
  • Dougie noted we want to update the grid format for MOM, these changes need to be done in the new grid format. He will liaise with Ezhil.

4xCO2

  • 4xCO2 run is showing lower climate sensitivity at 3.4°C (vs 3.9 in ESM1.5).
  • The current hypothesis is a link with the change in sea-ice in the simulation. Martin is still looking into it.
  • Rachel proposes to try a 1% simulation to compare.

Aerosol emissions for Fast-Track

  • Martin is running a test with the updated aerosol emissions.
  • They are pretty similar to CMIP6 and no large change is expected.

OneAPI dependency on CICE5

  • Manodeep to coordinate with Anton to set a ESM1.6-CIC5 test with OneAPI.

Data storage

  • Peter Dobrohotoff has identifies some space in /g/data/p73 for development runs.
  • Pearse asked for what data to keep from his ~900-year spinup.
  • Rachel to provide a list from a CMIP7 paper. Agreed on retaining annual averages only.
  • Discussed moving the data to CSIRO tape using existing scripts once it is cleaned up and in /g/data/p73/

ESM1.6-AMIP

  • Rachel wants to start an AMIP run initialised with a restart from the spinup.
  • Spencer says it should be possible to run. He will look into it.

Action items and next steps

  • Prioritisation of scientific changes at NESP project meeting.
  • Dave to add Jhan’s spin-up results to his CICE5 analysis.
  • Continue testing Mediterranean salinity fix.
  • Martin to continue investigating the climate sensitivity of ESM1.6.
  • Manodeep to start an ESM1.6-CIC5 test with OneAPI.
  • Rachel to share CMIP7 variable list with Pearse.
  • Pearse to proceed with data transfer.
  • Spencer to assist Rachel with AIMIP configuration.

Next meeting

  • next Tuesday (10 June)