Quantifying Long-Term Glacial Erosion in Antarctica with Numerical Modeling and Thermochronology

冰盖对地形的侵蚀及其对气候变化的反应在很大程度上是未知的。冰盖对气候微小变化的快速反应能力是近年来地球科学中最令人担忧的观测结果之一。要更全面地了解冰川如何侵蚀地形以及冰盖对气候变化的反应，就需要对冰川侵蚀进行观测，并建立更好的冰川动态预测模型。在这项研究中，我们将测试的假设：（1）冰川侵蚀是紧密相连的国家的冰下水文学，崩解过程和冰流变学的科学预测;（2）冰川侵蚀的基础基岩取决于基础冰滑动速度;（3）温带冰川增加地形起伏的山脉。我们将使用模型和数据的集成，包括：（a）修改并行化的三维粘塑性和冰微物理数值模型，以模拟冰川侵蚀在短期和长期（~>101年）的时间尺度，和（B）评估模型物理使用观测基岩热年代学数据。

Ice sheet erosion of topography and their response to climate change is largely unknown. The ability of ice sheets to respond rapidly to small changes in climate is one of the most alarming observations in the Earth sciences in recent years. A fuller understanding of how glaciers erode topography and the response of ice sheets to climate change requires observations of glacial erosion, as well as better predictive models of glacial dynamics. In this study we will test the hypotheses that: (1) glacial erosion is tightly linked to state-of-the-science predictions of sub-ice hydrology, calving processes, and ice rheology; (2) glacial erosion of underlying bedrock depends on the basal ice sliding velocity; and (3) that temperate glaciation increases the topographic relief of mountains. We will use an integration of models and data including: (a) modification of a parallelized 3D visco-plastic and ice microphysics numerical models to simulate glacier erosion over short and long (~>101 yr) time scales, and (b) evaluation model physics using observations from bedrock thermochronology data.