Long Term Elevation Change Monitoring of Antarctic Ice Sheet by Combining ICESat, Envisat and CryoSat-2 Data

A long term assessment of the Antarctic ice sheet elevation change trend from 2003 to 2016 has been carried out using a combination of ICESat (2003–2008), Envisat (2003–2008) and CryoSat-2 (2010–2016). The contemporaneous ICESat and Envisat results showed a consistency in the estimated elevation change rate of Antarctica during 2003 to 2008: $0.1\pm 0.1\ \text{cm}\ \mathrm{a}^{-1}$ to $0.3\pm 0.6\ \text{cm}\ \mathrm{a}^{-1}$ , respectively, which were then combined as the overall elevation change of Antarctica during 2003 to 2008. The recent CryoSat-2 result suggested an overall elevation change rate of Antarctic ice sheet of from 2010 to 2016. Furthermore, the elevation change of East Antarctica is relatively small, while West Antarctica appears to have an elevation decrease trend. The above is based on our preliminary data processing and analysis results. The high uncertainties in Basin 15 and Antarctic Peninsula need to be further investigated. We will report our improved results at the conference.