Observed propagation of a large rift in the Larsen C ice shelf: rift development and possible consequences for the stability of the ice shelf

摘要: The Larsen C ice shelf is the most northerly of remaining major Antarctic Peninsula shelves and vulnerable to changes in both ocean atmospheric forcing. It largest region its loss would lead a significant drawdown from sheet. There have been observations widespread thinning, melt ponding northern inlets, speed-up flow, processes that all linked former ice-shelf collapses. Previous studies also highlighted vulnerability specific potential geometry, including retreat Bawden Gipps Ice Rise. Rift tips vicinity Rise observed align at suture zone between two flow units within shelf. Several provided evidence for marine these zones, which has found act as weak coupling with different velocities. concluded this inhibits propagation rifts because it can accommodate strain without fracturing further. In change usual pattern, northwards-propagating rift recently penetrated through now more than halfway towards calving large section rate accelerated during 2014. When next event occurs, likely lose around 10% area reach new minimum We followed on MODIS Landsat imagery used numerical model investigate influence future stability. find front risk becoming unstable when anticipated occurs.