Northeast Greenland Ice Stream, Greenland Ice Sheet, supraglacial lakes, sea level, ice sheet hydrology, surface mass balance, Lakes, Glaciers, Geophysics, Glaciation, Climate, Spatial discrimination, Melt water, Ice, Climate models, Meltwater, Inland waters, Drainage, Mass, 21st century, Elevation, Spatial distribution, Pathways, Volume, Dynamics, Ice age