Understanding and predicting the behaviour of the Antarctic Ice Sheet (AIS)
on decadal to centennial time scales is of global importance to policy
decisions, mainly due high uncertainty in the AIS contribution to sea level
change. Significant regions of the AIS rest on bedrock below sea level and
may be vulnerable to Marine Ice Sheet Instability (MISI), a mechanism for
rapid and potentially irreversible discharge of ice. Due to large
uncertainty as to which basins are vulnerable to MISI, and how rapid their
unstable retreat might be, even the sign of the contribution of the AIS to
sea level rise remains uncertain according to the fifth assessment report
of the Intergovernmental Panel on Climate Change.
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