ACCESS-ESM1.6 development

CMIP7 CMIP7 development
155

Hi everyone, the updates for the next spinup configuration are now complete and have been added to the ESM1.6 configurations repository.

Cloning the configuration

We’ve added a tag to the repository, 20250409-spinup-dev-preindustrial+concentrations, which points to the new spinup configuration. Using a tag lets us “freeze” the spinup configuration, allowing development to continue on the dev-preindustrial+concentrations without affecting the spinup configuration.

Note that the payu command for cloning a configuration based on a tag is slightly different to the command for cloning from a branch. To clone the spinup configuration from the new tag, use:

payu clone https://github.com/ACCESS-NRI/access-esm1.6-configs -s 20250409-spinup-dev-preindustrial+concentrations -b <new-branch-name>  <new-directory-name>

Here, it’s worth using a descriptive branch name for <new-branch-name>, e.g. 20250410-spinup.

Configuration details

Details on the changes are available in this issue, but to summarise:

  • Use the CMIP7 solar constant.
  • Update the WOMBAT-lite parameters to more recent ones used by @pearseb.
  • Use the Sapphire Rapids nodes.
  • Use an ocean restart from late in @pearseb’s previous spinup, and an atmosphere/land restart from year 30 of @Jhan’s MarchEpot simulation.
  • Use the latest WOMBAT-lite and UM7 code.

Many thanks to @dougiesquire, @pearseb, @manodeep, and @MartinDix for their work on these configuration changes.

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