An update on the test spin up runs as of 20/10/2025 - note that the 3 September spin up runs have transitioned to “October Spin ups” (including a bug fix to terrestrial carbon cycle). The 3 test spinup branched off from different years of the previous long (blue) April-June spin up (purple: test A from year 500, orange: B at year 991 and pink: C at year 300). Mean/trend numbers are from the last 50 years of each test simulation; light is annual values, dark a 10 year running mean.
Sea surface temperature and salinity (rapid increase originates in the Mediterranean)
Note there has been a failure of output for test-B at year 030 of the October-B run.
New test runs are sitting around 0.1K in SST (and mean surface air temperature) above the previous spin up and are more stable in full ocean temperature and salinity.