That is a great animation!
It also begs the question and would seem to suggest that melt ponds allow more warm air to pass *through* Greenland, supercooling in the process and being deposited the opposite site of whichever it enters.
That would explain why 2012's catastrophic melt was followed by mild seasons in both 2013 and 2014.
If Greenland acts as an enormous air conditioner for the Northern Hemisphere/Arctic, its "normal" capacity without melt would certainly be substantial. But with a season like 2012 on the books, it would fracture/split in many more locations versus a typical year in the 20th Century (which would have featured very little such activity). And then as you head into fall and solar radiation begins declining, you still have all the nooks and crannies for the air to pour through as it traverses the Greenland Ice Sheet... "activating" it as a much stronger cold source in the process, as the volume of air that can cool through the ice sheet increases dramatically (in addition to heat removed during nighttime/etc).
....of course then it would certainly follow that through the following fall/winter/several seasons, Greenland's cooling power would be enhanced until the nooks & crannies are filled with ice once more.
But perhaps like we've seen in the Arctic, the "new" ice in these locations is much easier to melt vs. the old stuff, which means that the cycle continues repeating & worsening until there is no rebound year and glaciation begins across the NHEM (specifically NE Canada, then spreading from there) once more.