Deeper Look – Episode 4
North Atlantic Oscillation Lesson For The Day
Positive Phase – Warming – Solar Maximum, Solar Minimum
Negative Phase – Cooling – Solar Minimum
Solar Maximum favors positive phase, Solar Minimum shows an oscillation back and forth.
Two great papers:
http://www.nature.com/ncomms/2015/150915/ncomms9268/full/ncomms9268.html
http://arxiv.org/pdf/physics/0702057.pdf