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AOGCM-ISM Breakout-group, 12/09/18 Sassenheim, NL

(NB please email corrections to


  • Robin Smith
  • Bill Lipscomb
  • Miren Vizcaino
  • Sebastien le'Clech
  • Melchior van Wessem
  • Leo van Kampenhout
  • Marie Kapsch
  • Laura Muntjewerf
  • Ayako Abe-Ouchi

Since the ISMs will now use a baseline of 1970-2000, does it still make sense to do a coupled preindustrial and historical? MPI-ESM and CESM are planning/doing long coupled spinups under PI conditions.

Everyone would like to see coupled experiments run out beyond 2100 to see greater changes in the ice. A longer 1% run was seen as the best option for that, ensuring compatibility with past and future MIPs rather than extending any CMIP6 ScenarioMIP forcing.

Both UKESM and CESM have seen significant impacts on the North Atlantic when interactive icesheet runoff/calving is supplied due to the impact on the freshwater balance, and snow/ice building up in the north of Greeland

UKESM, CESM and MPI-ESM all use some form of sub-atmospheric-grid downscaling for icesheet surfaces. MIROC-ESM would like to use tiles.

Can we decide on a standard grid/resolution/frequency for supplying tiled output to ISMIP6 for surface forcing. The proposed vertical and time resolutions (5km grids, 100m in the vertical) had been suggested, the datasets will become huge.

Continued communication between the groups would be useful