The jump from the old record was the largest since record-keeping began.
That cold spot off of Greenland is of particular concern. The slowing of the current that keeps Europe warm had devastating consequences for the region last time it slowed. Now it's happening again due to freshwater injection from Greenland's accelerating melt.
Jump from 2014 to 2015 is enormous, for a few reasons.
Edited by TasteTheRainbow