Modern Subglacial Groundwater Exfiltration, All Permeability Scenarios

Gridded predictions of modern subglacial groundwater exfiltration rate (mm yr⁻¹), generated from the analytic hydromechanical model forced with present-day observed ice-sheet thinning rates, across the full tested range of sediment permeability (1×10⁻¹¹ to 1×10⁻¹⁵ m²; five files, one per scenario). Model outputs were flattened to x–y coordinates and filtered to remove non-finite values. Unlike the paleo reconstructions, no confidence-interval trajectories are provided here, as this dataset is not derived from the bootstrapped thickness ensemble. Each permeability scenario is a single deterministic prediction, generated for comparison against the paleo-derived reconstructions.