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111-5）资助的。该奖项支持对南极西部接地区的过程进行建模研究，从基岩上的冰到海面上的冰的过渡，着眼于理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。 新的高分辨率地表高程图是由卫星激光测高和远程观测地表形状的新组合制成的，提供了一个独特的接地区视图。这些数据将用于诊断与卡姆冰流关闭相关的事件，调查研究所冰流最近的排放事件，并调查惠兰冰流出口的持续变化，沿着西南极洲周围的其他现代过程。现有的耦合冰盖，冰流和冰架流的数值模型将被使用和改进的研究项目的一部分。 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。 改进的观点，解释和洞察力的物理过程，管理冰盖出口流的变化将有助于纠正的缺点，最后一次IPCC报告，没有？不包括冰盖在海平面上升中的作用。PI在公共宣传、参与专业社区和学生培训方面有着良好的记录。

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.