Fig. 6 | Nature Communications

Fig. 6

From: Distribution and dynamics of Greenland subglacial lakes

Fig. 6

Conceptual model of Greenland ice sheet hydrological system, illustrating supraglacial and subglacial features. Subglacial lakes are colour-coded according to lake persistence, those that are less distinct and could represent shallow water lenses or patches of saturated sediment are coloured brown. Estimated basal thermal state is represented by the red to blue colour bar, with red being likely thawed, white being uncertain regions, and blue being likely frozen1. In the ice sheet interior, the ice is mostly frozen to the bed and the basal topography is flat, prohibiting water storage and subglacial lake formation. Above the equilibrium line altitude (ELA) but away from ice divides, where the bed is predicted to comprise a heterogeneous patchwork of frozen and warm-bedded conditions, subglacial lakes are relatively common but stable features. Around the ELA, subglacial lakes are hydrologically active and recharged seasonally by inputs of surface water. Finally, relatively numerous small subglacial lakes that drain on seasonal timescales when efficient subglacial networks develop during the melt season likely exist in the ablation zone

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