Ice-shelf thickness changes are of critical importance for understanding the stability of the Antarctic ice-sheet because they restrain the seaward flow of grounded glaciers. In this study, we find that neither backscatter nor leading-edge width contained in the least-squares fitting model can improve the accuracy of ice-shelf thickness change estimations from CryoSat-2, which is validated by comparing the CryoSat-2-derived elevation changes from least-squares fitting models with different combinations of waveform parameters against the Operation IceBridge ATM L4 data. Using the model without backscatter and leading-edge width to infer the thickness changes in Antarctic ice shelves from CryoSat-2, we find that the most significant thinning signals are mainly concentrated on the ice shelves along the Amundsen Sea coast, such as Getz, whose thickness variations are dominated by ocean-driven basal melting. This phenomenon has also been confirmed by the ICESat results. Overall, the Antarctic ice shelves volume changed on average by –0.34 ± 66.36 km³ yr⁻¹ during the period from July 2010 to December 2016.

冰架厚度的变化对于理解南极冰盖的稳定性至关重要，因为它们限制了地面冰川向海流动。在这项研究中，我们发现最小二乘拟合模型中包含的后向散射和前沿宽度都不能提高CryoSat-2估计的冰架厚度变化的准确性，这一点通过比较CryoSat-2得出的高程得到了验证从最小二乘拟合模型（具有不同的波形参数组合）相对于Operation IceBridge ATM L4数据的变化。使用没有反向散射和前沿宽度的模型来推断CryoSat-2的南极冰架的厚度变化，我们发现最明显的稀疏信号主要集中在阿蒙森海沿岸的冰架上，例如Getz，其厚度变化主要受海洋驱动的基底融化作用。ICESat结果也证实了这一现象。总体而言，南极冰架体积平均变化了–0.34±66.36 km从2010年7月到2016年12月，为期³年^-1。