Idealized Greenland Ice Sheet Deglaciation Experiments (2025)

Idealized experiments for the deglaciation of the Ice Sheet in Kalaallit Nunaat (Greenland) in response to a variety of warming scenarios. Understanding how much the Greenland ice sheet melted in response to past warmth helps better predicting future sea-level change. Increasingly, observations from beneath the ice-sheet are being used to identify times in the past when the ice-sheet was smaller than it was today, but we have lacked a framework for scaling up observations from a single location to say something meaningful about the volume and geometry of the ice sheet. Here we present an ensemble of ice-sheet model simulations to provide constraints on how much mass the ice sheet loses before different areas become ice-free. As observations from subglacial archives become more abundant, this framework can guide subglacial sampling efforts to gain the most robust information about past ice-sheet geometries.