cryosphere, Antarctica, ice shelves, mass balance, CryoSat‐2, Glaciation, Detaching, Elevation, Ice thickness, Dynamics, Trends, Sea level rise, Ice, Land ice, Regions, Sea level, Bedrock, Ice cover, Altimetry, Velocity, Estimates, Thickness measurement, Thickness, Drainage, Mass, Satellites, Thinning, Glaciers, Mass balance of glaciers