The Effects of Subglacial Discharge on Ice-Shelf Melt Patterns and Ice-Sheet Response - Franka Jesse

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• Franka Jesse - Utrecht University
• Thursday 06 November 2025, 14:00-15:00
• BAS Seminar Room 330b.

If you have a question about this talk, please contact Katherine Turner.

Subglacial discharge, the release of freshwater from beneath glaciers into the ocean, affects melt patterns beneath Antarctic ice shelves. The added buoyancy at the grounding line accelerates meltwater flow, which directly enhances melt rates and increases entrainment of ambient ocean water. In this seminar, I will present ongoing work on implementing subglacial discharge within the sub-shelf melt model LADDIE2 .0. We will explore how subglacial discharge affects melt patterns beneath different ice shelves, highlighting the magnitude of melt amplification and the most impacted regions. I will also show results from idealised (simplified geometry and forcing) coupled experiments using LADDIE2 .0 and the ice-sheet model UFEMISM2 .0. Interestingly, in these simulations, the strongest initial melt anomalies from including subglacial discharge do not necessarily lead to the greatest long-term ice-sheet mass loss. Instead, the release location of subglacial discharge plays a key role.

This talk is part of the British Antarctic Survey - Polar Oceans seminar series series.

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