I believe that one of the factors in any variation in climate is the ocean temperature, and that it is highly influenced by undersea volcanos.
Nothing complicated, just common sense combined with information that is available.
You'll note that the Arctic Ocean is warming from the west, up from the Aleutians and the Ring of Fire.
Woods Hole Oceanographic Institute (WHOI) pronounced (who-ee). I would change the name of my research group.