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. This study employs ICESat and ICESat-2 satellite altimetry data from NASA’s ICESat (2003-2009) and ICESat-2 (2018-2020) missions to systematically quantify ice sheet elevation dynamics and associated to volumetric changes between 2003 and 2020, To mitigate intra-annual variability effects, analysis was constrained to temporally homologous quarter (January to April), ensuring interannual comparability through consistent seasonal sampling.