Cross-Mission Synergy of ICESat and ICESat-2 for Estimating Greenland Ice Sheet Elevation Change from 2003 to 2020 Greenland Ice Sheet is one of the key factors influencing global climate change. Its slight variations can lead to significant changes in sea level, making quantitative research on its mass balance of great scientific importance. Categories: Geoscience and Remote Sensing North and South Poles Remote Sensing