1 October 2014
Observations of moulins (vertical conduits connecting water on top of the glacier down to the bed of the ice sheet) and boreholes in Greenland show that subglacial channels ameliorate the speedup caused by water delivery to the base of the ice sheet in the short term. By mid summer, however, the channels stabilize and are unable to grow any larger.
http://feeds.sciencedaily.com/~r/sciencedaily/~3/ue0WB4DTQlY/141001185934.htm
