The big question is how exactly this Arctic Oscillation is being impacted by loss of sea ice and generally warmer surface and ocean temperatures. NOAA's recent "Arctic Report Card" is the best resource so far for answers. The very basic formula seems to be: warmer Arctic temperatures lead to loss of sea ice in the Arctic, which leads to changes in air pressure and wind patterns in northern latitudes, which very probably lead to colder temperatures and more severe winter storms across North America and northern Europe.
