Date: Dec 3
AM3 is now upgraded to vn13.8. This allows direct comparison with Met Office GC5 central configurations.
Upcoming release of an updated OM3 25km configuration includes bathymetry changes and chlorophyll based opacity.
Sea-ice
Both CM3 and OM3 have too large NH ice volume, Arctic sea-ice depth ~2x higher than previous configs · Issue #65 · ACCESS-NRI/dev_coupling · GitHub. OM3 has some very thick ice stuck in coastal features but CM3 problem seems different. @sofarrell says CM3 has very little bottom melting.
Datastore related issues
Test creating single variable UM output with a new run and check if datastore based on this fixes the slowdown. Ensure CM3 uses OM3 diag table
Problems with virtualisation of Wilma’s CM2 run, CM2 25km present day control run for comparison · Issue #43 · ACCESS-Community-Hub/access-cm3-paper-1 · GitHub. Consider splitting the most importatnt atmospheric variables to a separate collection?
Consider adding CM2 piControl to the notebook template?
@kieranricardo reports loading CM3 ice data is slower than OM3. @anton suggests this may be because files have coordinate variables (which were removed from OM3). However files like `/g/data/zv30/non-cmip/ACCESS-CM3/cm3-run-11-08-2025-25km-beta-om3-new-um-params/archive/2000/ice/access-cm3.cice.1mon.mean.2000-01.nc` don’t have grid variables, though do have angle and anglet which are probably unnecessary.