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Using an ensemble of EC-Earth coupled climate model simulations we explore the association of the seasonal-mean Arctic sea ice cover with extreme anomalies in the surface climate (on seasonal and intraseasonal timescales). We first assess these teleconnections in a set of pre-CMIP6 (H2020 PRIMAVERA) simulations in which sea ice cover evolves freely. Results are compared across different forcing boundary conditions (fixed present-day, historical and future scenarios), and horizontal spatial resolutions (1° vs 0.25° in ocean/atmosphere). Co-variability patterns of surface extreme climate with sea ice cover obtained from these different PRIMAVERA simulations are finally compared to a preliminary set of CMIP6 (PAMIP) simulations in which sea ice cover is prescribed and held invariant across years, allowing us to better establish causation in the climate system.

Full Article: https://www.zenodo.org/record/3564164