Little data available for sea temperature record in the artic. pacific decadal oscillator may be pushing warm currents thru the Bering Straits ?
Stratospheric air temperatures are now available from NASA sattelite measurement which is suposedly more accurate, so data from now on should be less disputed.
Freeman Dyson points out the influence of ozone layer depletion as a factor in antartic cooling but not yet in the artic
http://www.youtube.com/watch?v=k69HUuyI5Mk&feature=related (very smart scientist with a different focus)
Will be interesting to see what happens this winter staring about now .