25 years of elevation changes of the Greenland Ice Sheet from ERS, Envisat, and CryoSat-2 radar altimetry

摘要: Abstract The shape of the large ice sheets responds rapidly to climate change, making elevation changes these ice-covered regions an essential variable. Consistent, long time series are great scientific value. Here, we present a newly-developed data product 25 years Greenland Ice Sheet, derived from satellite radar altimetry. is made publicly available within Sheets project as part ESA Climate Change Initiative programme. Analyzing repeated measurements altimetry widely used for monitoring regions. Sheet has been mapped by conventional since launch ERS-1 in 1991, which was followed ERS-2, Envisat and currently CryoSat-2. recently launched Sentinel-3A will provide continuation series. Since 2010, CryoSat-2 first measured coastal sheet with altimetry, its novel SAR Interferometric (SARIn) mode, provides improved measurement over steep slopes. apply mission-specific combination cross-over, along-track plane-fit change algorithms ERS-1, missions, resulting nearly continuous estimates (1992–2016) Sheet. This analysis possible through recent reprocessing REAPER project, ERS-2 them consistent data. evaluated 5-year running means, shifted almost continuously one year. A clear acceleration thinning evident maps following 2003, while only small observed 1990s.