Grid files of the total isostatic response to the complete unloading of the Greenland and Antarctic Ice Sheets (version 2)

The land surface beneath the Greenland and Antarctic Ice Sheets is isostatically suppressed by the mass of the overlying ice. Accurate computation of the land elevation in the absence of ice is important when considering, for example, regional geodynamics, geomorphology, and ice sheet behaviour. Here, we use contemporary compilations of ice thickness and lithospheric effective elastic thickness to calculate the fully re-equilibrated isostatic response of the solid Earth to the complete removal of the Greenland and Antarctic Ice Sheets. We use an elastic plate flexure model to compute the isostatic response to the unloading of the modern ice sheet loads, and a self-gravitating viscoelastic Earth model to make an adjustment for the remaining isostatic disequilibrium driven by ice mass loss since the Last Glacial Maximum. Feedbacks arising from water loading in areas situated below sea level after ice sheet removal are also taken into account. In addition, we quantify the uncertainties in the total isostatic response associated with a range of elastic and viscoelastic Earth properties. The computed isostatic response grids are provided in NetCDF format and have a number of applications for studying regional geodynamics, landscape evolution, cryosphere dynamics, and relative sea level change.

格陵兰冰盖与南极冰盖下方的地表，会被上覆冰体的质量引发地壳均衡下陷。精准计算无冰状态下的陆地高程，在研究区域地球动力学、地貌学以及冰盖行为等议题时具有重要意义。本研究利用当前已汇编的冰厚度与岩石圈有效弹性厚度（lithospheric effective elastic thickness）数据，计算固态地球在完全移除格陵兰与南极冰盖后达到完全均衡再平衡的响应。我们采用弹性板挠曲模型（elastic plate flexure model），计算现代冰盖荷载卸载后的地壳均衡响应；同时使用自引力黏弹性地球模型（self-gravitating viscoelastic Earth model），校正自末次冰盛期（Last Glacial Maximum）以来冰量流失所引发的剩余均衡失衡问题。本研究还考虑了冰盖消融后位于海平面以下区域的水体加载所产生的反馈效应。除此之外，我们量化了由一系列弹性与黏弹性地球物理参数所带来的总均衡响应不确定性。本研究计算得到的均衡响应网格数据以NetCDF格式提供，可广泛应用于区域地球动力学、地貌演化、冰冻圈动力学以及相对海平面变化等相关研究领域。