ESM working group: Meeting notes 2024

Earth System Working Group
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36

Date: 27/2/2025
Participants: 17
Chair: @tiloz

  1. Opening and welcome:
  • There are no speakers confirmed for future meetings. Please consider presenting, or inviting a colleague to present. Members are encouraged to reach out to @spencerwong or any co-chair if they are interested in presenting.
  • PhD students and early career researchers are encouraged to present. Presentations to the ESM WG can be an opportunity to receive early feedback from the community on in-progress work.
  1. Shared Resources and Experiments:
  • ESM project lg87 has used 470 KSU of its 875 KSU allocation for this quarter. /g/data storage has grown to 54.3TB of the 100TB allocation.
  • Georgina Falster has a plan for large runs using ACCESS ESM1.5, which should be able to begin this quarter.
  • Do you have any proposals for shared experiments? See guidelines for how to do this. There are often used resources we can access if there are projects to use them.
  1. CMIP7 Fast Track Presentation:
  • Pearse Buchanan presented results from a long spin-up simulation of a prototype ACCESS ESM1.6, focusing on the ocean biogeochemistry.
  • The 650 year simulation included new WOMBAT-lite ocean biogeochemistry, and the iceberg freshwater distribution scheme. Land/atmosphere changes will be incorporated in the future.
  • Ocean physics
    • Ocean temperature and salinity show small downward are downward trends which are within the range of variability. Surface temperature and salinity are quite stable, while the total volume and mass of ocean trend upwards.
    • The heat budget has slight positive bias, however will require further analysis. The freshwater flux is balanced appears balanced.
  • Ocean BGC
    • Carbon and alkalinity have small drifts, however with magnitudes not significant enough to cause concern.
    • Oxygen, alkalinity, and iron show larger drifts, and will require further investigation. Results may be impacted by a conservation bug present at the start of the run, though subsequently fixed.
    • Despite issues in the deeper ocean, surface iron looks good compared to observations, as do chlorophyll and CO2 fluxes.
      Next steps:
    • Investigate cause of drift in oxygen and iron, considering changes in age, and overturning.
    • Incorporate parallel updates to CABLE into the spinup simulation.

Presentation slides:
2025-02-27 ACCESS-Hive Earth System Modelling group.pptx (8.2 MB)

Additional information