Collaborative Research: Greenland Ice Sheet Basal Hydrology and Sliding Dynamics ? The Proof of the Drill

合作研究：格陵兰冰盖基础水文学和滑动动力学？

• 批准号: 0909495
• 负责人: Joel Harper
• 金额: $ 47.43万
• 依托单位: University of Montana
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2009
• 资助国家: 美国
• 起止时间: 2009-10-01 至 2013-09-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0909495&HistoricalAwards=false
• 关键词: Collaborative; Research; Greenland; Ice; Sheet

This award is funded under the American Recovery and Reinvestment Act of 2009 (Public Law 111-5).Recent changes in the flow dynamics and overall geometry of the Greenland Ice Sheet have been concurrent with increased surface melting: the velocity of some outlet glaciers has increased, the ice sheet margins have thinned, and the overall mass of the ice sheet has declined by more than melt alone can account for. A direct linkage between surface melt and ice sheet change is commonly argued but has not been proven. In the proposed work, direct connections between surface melt, the basal hydrological system, and ice motion will be quantified along a flow-line transect of the Greenland Ice Sheet. The region to be studied receives high surface melt, but is located far from the influence of ocean tidewater dynamics. Basal conditions will be directly measured in six boreholes drilled to the bed, with two holes at each of three sites. Surface melt and spatial gradients in ice velocity will be quantified to enable detailed comparison between melt water forcing, basal hydrologic conditions, and ice flow dynamics. Instrumentation at the surface, within the ice, and at the bed will collect data at high time resolution for up to 2 years. Two models will be used to interpret the mechanical and thermal context of the measurements. In turn, the intensive measurement campaign will uniquely constrain the modeling and enable model assessment. This integrated measurement and modeling campaign will be a comprehensive investigation of the role of water in ice sheet motion. This work will support two Ph.D. dissertations and provide field research experiences to at least five students. Several informal education and outreach activities will be supported, including a high proportion of Native American participants.

该奖项是根据2009年的《美国回收与重新投资法》（公法111-5）资助的。格陵兰冰盖的流动动力和整体几何形状的发生变化与表面融化的增加是一致的：一些出口冰川的速度已经增加，而冰盖的整体却很少，而且冰盖的质量比造成的，而冰盖却造成了更大的限制。通常会争辩表面熔体和冰盖变化之间的直接连接，但尚未得到证明。在拟议的工作中，将沿格陵兰冰盖的流动线界面量化表面熔体，基础水文系统和冰运动之间的直接连接。要研究的区域接收高表面熔体，但远非海洋潮水动力学的影响。基础条件将直接在六个钻孔到床的孔中测量，三个地点的每个孔都有两个孔。冰速度中的表面熔体和空间梯度将被量化，以实现熔体强迫，基础水文条件和冰流动动力学之间的详细比较。在表面，冰上和床上的仪器将在高时间分辨率收集2年的数据。将使用两个模型来解释测量的机械和热环境。反过来，密集的测量活动将唯一限制建模并启用模型评估。这项集成的测量和建模运动将是对水在冰盖运动中的作用的全面研究。这项工作将支持两位博士学位。论文并为至少五名学生提供现场研究经验。将支持一些非正式的教育和外展活动，包括很大一部分美国原住民参与者。