Seasonal Response of Midlatitude Internal Variability to Sea Ice Loss

In recent years there have been many studies interested in the response of midlatitude weather to sea ice loss. Here, we explore the seasonality of the response of the midlatitude jet-stream variability and relate the response to the leading EOFs of the present-day climate. To do that we examine models of increasing complexity: a dry dynamical core, an atmosphere-only GCM, and a fully couple climate model. Methods used include quantifying changes in the leading EOFs, and analysis of the full variance field, as well as memory and persistence of the winds. Results indicate a change in the variability in some seasons but not others, and comparisons across models suggest that atmosphere-ocean coupling plays a strong role in mediating this change.