Main biases in n1850.ne30pg3_tn14 simulations as of noresm3_0_beta09

[TomasTorsvik]

List of reference simulations:

1. Long reference simulation:
   • n1850.ne30pg3_tn14.noresm3_0_beta09-run2_yr001.20251223 #307
   • n1850.ne30pg3_tn14.noresm3_0_beta09-run2_yr031.20251227 #309
   • n1850.ne30pg3_tn14.noresm3_0_beta09-run2_yr051_cplhist.20251230 #310
   • n1850.ne30pg3_tn14.noresm3_0_beta10-run1_yr101.20260120 #319
2. CESM dev tuning parameter:
   • n1850.ne30pg3_tn14.noresm3_0_beta09.CESM3devTuning.v2.20251222 #306
   • n1850.ne30pg3_tn14.noresm3_0_beta10-run2_yr101.20260120 #320
3. Sensitivity studies
   • a. Reference: n1850.ne30pg3_tn14.noresm3_0_beta09-run1_yr001.20251218 #299
   • b. High-Low cldfrc_dp1:
     • Sensitivity simulation for low dp1n1850.ne30pg3_tn14.noresm3_0_beta09-run1_yr001_lowdp1 based on n1850.ne30pg3_tn14.noresm3_0_beta09-run1_yr001.20251218 #299 #300
     • Sensitivity simulation for high dp1n1850.ne30pg3_tn14.noresm3_0_beta09-run1_yr001_highdp1 based on n1850.ne30pg3_tn14.noresm3_0_beta09-run1_yr001.20251218 #299 #300 #304
   • c. High-Low micro_mg_autocon_lwp_exp:
     • n1850.ne30pg3_tn14.noresm3_0_beta09-run1_yr001.20251218_lowmicromgautoconlwpexp #302
     • n1850.ne30pg3_tn14.noresm3_0_beta09-run1_yr001.20251218_highmicromgautoconlwpexp #303

Ocean biases

ocean timeseries 2026-01-22

Ocean salinity is slightly lower than CMIP6 references, surface salinity is slightly higher, but trending downward. High surface salinity in the Arctic. Salinity is still drifting, but currently looks better than for the ne16pg3 long simulation.

Ocean temperature is lower than CMIP6 reference, but may be drifting upwards, in particular for SST, which is probably an advantage.

Do we need to change some ocean parameters for ne30pg3, or do we wait to see if the drift settles down?

Sea ice

sea ice timeseries 2026-01-22

Sea ice extent is generally too large in both hemispheres. NH sea ice extent may be drifting downwards, SH sea ice extend seems fairly stable, and much too large for September maximum.