UKESM-fast for UKESM-CN

Colin wants to apply UKESM-fast ideas to UKESM-CN N96 ORCA1

  • Increase Δt: 20 -> 30 mins
  • Increase radiation timestep: 1hr -> 3hrs
  • Increase GLOMAP timestep: 1hr -> 3hrs
  • Reduce vertical levels 85 -> 38 (same as used for HadGEM2-ES)
  • Colin hopes speed: 6 -> 20 model years/day