And I think one of those inflection points was 2012.
I am rather unclear on 2012....there is a difference between the point of inflection and the point where the system has to fall away from the potential surface in order to reorganize.
It is, however, clear to me that in late December 2015 the Arctic climate became disconnected from its prior meta-stable state.
It could very well be true that the inflection was reached sometime in 2012 and it took 3 years to start into freefall.
[ed: Note: I am assuming a continuous potential surface. There is no real known reason to assume that, but it has seemed to work in the past.]