This narrow zone—where the grounded ice sheet transitions into a floating shelf—is challenging to observe and model because of the remoteness of ice sheet beds and ice shelf cavities and is thus poorl

The gap

Consensus across the literature

Supporting evidence — 3 representative gaps

• A New Bathymetry for the Southeastern Filchner‐Ronne Ice Shelf: Implications for Modern Oceanographic Processes and Glacial History (2018) · doi

  A prerequisite for modeling the ice sheet and oceanographic processes within the cavity is an accurate knowledge of the sub‐ice sheet bedrock elevation, but beneath the ice shelf where airborne radar cannot penetrate, bathymetric data are sparse.

  Keywords: sheet prerequisite modeling oceanographic processes within cavity accurate knowledge bedrock elevation beneath shelf airborne radar
• Antarctic grounding zone and bedrock: the interplay shaping Antarctic sea-level contribution (2026) · doi

  This narrow zone—where the grounded ice sheet transitions into a floating shelf—is challenging to observe and model because of the remoteness of ice sheet beds and ice shelf cavities and is thus poorly understood.

  Keywords: sheet shelf narrow zone grounded transitions floating challenging observe model remoteness beds cavities thus poorly
• Ocean Stratification and Low Melt Rates at the Ross Ice Shelf Grounding Zone (2018) · doi

  However, due to the difficulty in accessing the sub‐ice shelf ocean cavity, the relationship between ice shelf melting and ocean conditions is poorly understood, particularly near the grounding zone, where the ice transitions from grounded to floating.

  Keywords: shelf ocean difficulty accessing cavity relationship melting conditions poorly understood particularly near grounding zone transitions