Meeting Notes 07/11/2025
Participants: @anton @MartinDix @sofarrell @clairecarouge @pearseb @Jhan @Aidan @alexnorton @lachlanswhyborn @manodeep @paulleopardi @rbeucher @spencerwong @tiloz @RachelLaw @inh599
Chair: @clairecarouge
OASIS3-MCT version
Question from Manodeep whether it is ok to pick up a newer version of oasis3-mct for ESM1.6. Decided updated versions of dependencies is part of the optimisation work and there is no objections as long as the results do not change (tests suggest results will be identical).
DOI for models
Aidan: we publish our models on Zenodo to get a DOI. There is a draft Zenodo record. We would like input from the community, especially around proper acknowledgments. Please add any comment to the GitHub issue.
Frozen model
Build
Lachlan is working on on incorporating the latest UM and CABLE changes to the build. Will be merged in soon.
Anton working on CICE changes. To be incorporated when ready.
Configurations
PI-control
Temperature drift in the ocean: Martin did some comparisons with WOA23 dataset. Results show we are not worst than ESM1.5 compared to WOA23. Siobhan commented the ocean is globally cooler in ESM1.6 than ESM1.5 so globally, we have a less warm bias at the top of the ocean and a cooler bias at the bottom.
Decision was made at the latest NESP meeting to use “October B” test for the spinup. The tests Oct-A and Oct-C are now stopped.
Spencer to update the dev-preindustrial+concentrations with the October B configuration plus volcanic input changes.
Pearse is still working out the best sinking rates for WOMBAT. These will be integrated to the configuration when ready.
The land folks are testing a new vegetation distribution (to solve the “disappearance” of dust over Australia) and updated vegetation parameters for the Australian PFTs. To be integrated when ready.
Paul is working on the nitrogen and ozone forcings. To be integrated when ready.
AMIP
Spencer will update the AMIP configuration to correspond to the updated dev-preindustrial+concentrations.
Historical
Rachel asked about the status of this configuration. Martin says it’s best to redevelop from the updated PI-control and AMIP.
Outputs
Paul noticed the surface altitude field is not bitwise identical between output files. Martin to have a look, he suspects we output a monthly average which would give small differences for months of different lengths.
Optimisation
Manodeep says 5 nodes gives 25 years/day while currently we get 21 years/day, this would be at a similar cost. Should we do optimisation work at 5 nodes?
Tilo and Rachel say yes, we want the throughput considering we are already late on the schedule.
CMIP7
New round of survey from CMIP7 has been released. Meeting next week for a sub-group of people to add the required information.
*Next meeting: this coming Tuesday (11th November), on normal schedule.