Collaborative Research: Mass Transit: Controls on Grounding and Ungrounding at Marine Ice Sheet Outlets

Hulbe/0838810该奖项是根据2009年《美国复苏和再投资法案》(公法第111-5条)资助的。该奖项支持对西南极接地带过程的模拟研究，即从基岩上的冰到漂浮在海洋表面的冰的转变，以期了解接地线配置和出口流量快速变化的相互关联的原因。将使用卫星遥感和数值模拟相结合的方法来调查过去和目前的变化模式。由卫星激光测高和遥感观测表面形状的新组合制作的新的高分辨率表面高程图提供了接地区的独特视角。这些数据将被用来诊断与坎布冰流关闭有关的事件，调查研究所冰流最近的一次排放事件，并调查惠兰冰流出口的持续变化，以及西南极周围的其他现代过程。作为研究项目的一部分，现有的耦合冰盖、冰流和冰架流动的数值模型将被使用和改进。该项目的更广泛影响涉及了解极地冰盖在全球海平面上升中的作用的重要性。这项工作将有助于政府间气候变化专门委员会(气专委)的下一轮审议。对控制冰盖出口气流变化的物理过程的看法、解释和洞察的改进将有助于纠正IPCC上一份报告的缺陷，该报告没有包括冰盖在海平面上升中的作用。PIs在公众宣传、参与专业社区和学生培训方面有很好的记录。

Hulbe/0838810 This award is funded under the American Recovery and Reinvestment Act of 2009 (Public Law 111-5).This award supports a modeling study of the processes in West Antarctic grounding zones, the transition from ice resting on bedrock to ice floating on the ocean surface with an eye toward understanding the interrelated causes of rapid change in grounding line configuration and outlet flow. A combination of satellite remote sensing and numerical modeling will be used to investigate both past and ongoing patterns of change. New high-resolution surface elevation maps made from a novel combination of satellite laser altimetry and remotely observed surface shape provide a unique view of grounding zones. These data will be used to diagnose events associated with the shutdown of Kamb Ice Stream, to investigate a recent discharge event on Institute Ice Stream and to investigate ongoing change at the outlet of Whillans Ice Stream, along with other modern processes around the West Antarctic. An existing numerical model of coupled ice sheet, ice stream, and ice shelf flow will be used and improved as part of the research project. The broader impacts of the project relate to the importance of understanding the role of polar ice sheets in global sea level rise. The work will contribute to the next round of deliberations for the Intergovernmental Panel on Climate Change (IPCC). Improved views, interpretations, and insights into the physical processes that govern variability in ice sheet outlet streams will help correct the shortcomings of the last IPCC report that didn?t include the role of ice sheets in sea level rise. The PIs have a strong record of public outreach, involvement in the professional community, and student training.