This poster summarizes key attributes of the global sea ice solution in the E3SMv2 North American Regionally Refined Model (NARRM) relative to the standard coupled model. We compare 500-year preindustrial simulations of the two models as well as historical ensembles to understand the impact of 14km marine regional refinement over the entire Arctic Ocean and North American coastal regions coupled to 25km atmospheric refinement extending to abyssal areas off North American coasts. The refinement is relative to 30-60km and 100km respective standard resolution ocean and atmosphere meshes. For the pre-industrial control, Arctic regional refinement results in an average 5000 to 6400 km3 greater simulated ice volume in the Northern Hemisphere than at standard resolution, a 16% (winter) to 57% (summer) increase over the 500-year preindustrial controls at 99% compatibility. There is only a small associated improvement in Arctic summer sea ice extent, and virtually no change in southern hemisphere ice cover relative to standard resolution. For the industrial period, we intercompare 5-member ensembles against the latest NOAA Climate Data Record of ice concentration to provide an integrated ice edge error. This indicates there is little improvement within 2𝝈 of the observed winter ice edge even with Atlantic regional refinement, and that the NARRM model configuration does not resolve a chronic ice-edge bias in the model. Both models successfully reproduce climatological circulation features seen in the Polar Pathfinder approximation of sea ice drift from 1980 to 2014, with an increase in sea ice kinetic energy associated with eddying activity and coastal currents where regional refinement is most pronounced.
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