melt event, CryoSat‐2, elevation change, Greenland, altimetry, Snow, Waveform analysis, Geophysics, Meteorology, Drilling, Glaciation, Greenland ice sheet, Bias, Scattering, Waveforms, Altimeters, Ice, Properties, Estimates, Ice formation, Elevation, Area, Penetration, Radar, Radar altimetry, Stratigraphy, Layers, Drying