Meeting minutes (08/07/2025)
Participants:
@cbull
@anton
@Aidan
@MartinDix
@pearseb
@alexnorton
@clairecarouge
@dhb599
@dougiesquire
@harshula
@inh599
@jemmajeffree
@manodeep
@paulleopardi
@RachelLaw
@rbeucher
@spencerwong
@tiloz
Chair: @clairecarouge
Minutes: @cbull
Manodeep optimisation update
oneapi with a new version is now matching classic compiler performance
19.6 vs 19.1 years per wall day. See PR for details
Manodeep is also looking into optimisation in terms of layout changes but this will break reproducibility. Martin: would entertain it if the performance was worthwhile so would be good to profile (as long as it doesn’t break determinism).
Aidan on metadata standards. Clare, Kelsey, Aidan, Martin, Romain have been working on an output specification document that describes all the ESM1.6 output. Aidan has been leading the global attributes spec’ where the plan is for this information to be injected into the file outputs by Payu using Axiom (e.g. model, model version, uuid etc). Aidan can share the doc via Sharepoint (needs an invite). Jemma suggestion: “I think it’s valuable to keep stuff that’s in the filename also in the metadata, just because it’s harder to accidentally rename the metadata.”
Claire: thinking behind netcdf version, is it for compression? Aidan: No there’s a few things, Netcdf 4 classic has a smaller subset of Netcdf 4 and is backwards compatible – however, compression is worthwhile. Anton: can turn on compression for cice (not sure of effort or timeline) but it’s part of a wider plan.
Ian: land (cable + mosis) via the UM makes things a little complicated so needs to be described more carefully (can take the discussion offline, Dougie is interested too). Rachel: is there any synergy here between cmor and the existing outputs? Romain: some but this process helps facilitate cmor-isation.
Spencer and Martin have found an old bug in the inland basin code for river (runoff?) which they are investigating.
Wouldn’t it be simpler just to assign salinity from the surface to every depth level in the Mediterranean? and run a control & new config from there?
Mediterranean sea (this discussion was also continued after the stand up with @MartinDix, @RachelLaw, @pearseb, @inh599, @cbull, @dougiesquire)
@ezhilsabareesh8 is leaving ACCESS-NRI so progress on this has been disrupted, see Ezhil’s summary. @cbull has been looking into it and was interested in what @inh599 and others had already looked at (sea surface salinity mostly). Rachel suggested ping’ing @matthew.chamberlain on the GH issue for the latest set of plots he’s made. The discussion converged on trialling bigger bathymetry changes (or aphysical mixing as @dhb599 proposed) and re-setting the whole med’ sea salinity back to initial conditions. Concern that the excess salinity in the western salinity may flow out into the Atlantic and affect the AMOC (we should try and avoid this) although a signature of western med salinity is visible in the Atlantic in the i.c. files.
Both @clairecarouge and @cbull can’t attend next week. Martin and Spencer can run next week (chair/minutes resp’)