Figure 4: Ice surface and bed hydrology and motion at the western margin of the GrIS.
From: Subglacial lake drainage detected beneath the Greenland ice sheet
(a) Distribution of observed supraglacial streams (light blue) and inferred moulins (black dots) over winter flow speed44 and (b) modelled subglacial water pathways (red) and InSAR-derived downward displacement in metres (yellow to blue). The background is a hillshaded version of the SETSM DEM. The collapse basin shown in Fig. 2 is highlighted by the black box. The supraglacial catchment drained by the moulin in Fig. 1 is shown outlined in dark blue. The thick black line indicates the ice sheet margin, the thin black line indicates 500 m elevation contours and the white line is the northern extent of the InSAR data.
