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.
The scientists weren't able to take measurements right next to the glacier fronts, but the warm water mass showed no dissipation from the fjord's mouth to within a few kilometers of the front.
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.