When the processes of loss and addition are approximately in balance, the glacier front stays in about the same place.
The additional heat weakens the ice tongue and promotes cracking and calving from the glacier front.
The glacier front, still exposed to the warmer water, recedes.
Pack ice in the fjords was so thick that even the Arctic Sunrise couldn't penetrate to the glacier fronts.
Jacobs had never witnessed upwelling first hand, but colleagues had described something similar in the fjords of Greenland, where summer runoff and melting glacier fronts
can also drive buoyant plumes to the sea surface.