Major increases would have to be fuelled by a faster flow of glaciers on the Greenland or Antarctic ice sheets. (news.bbc.co.uk)
Since the trough is impeding the outward flow of the glacier, doesn't this suggest that if the grounding line retreats into the trough, the glacier mass will no longer be impeded, and the driving stress which would previously build up would now be able to move the ice forward, and so tend to offset the retreat of the grounding line? (realclimate.org)
Larsen C is approximately 350m thick and floats on the seas at the edge of West Antarctica, holding back the flow of glaciers that feed into it. (sciencedaily.com)