Classic weakened AO caused by ice loss

We'll discuss this new paper in class:

Jennifer A. Francis and Stephen J. Vavrus,
Evidence linking Arctic amplification to extreme weather

in mid-latitudes

The grave difficulty with this new finding, if corroborated, is that the deeper oscillations, even though they will contribute to severe weather events, will also likely appear to most people in the US and UK as "global cooling. This despite the fact that the planetary and northern hemisphere AAT will have warmed.

This will add to our difficulties getting a sensible climate policy, especially if other results suggesting a lower, narrower band for climate sensitivity are also replicated from multiple different approaches.