Collaborative Research: Controls on the motion of soft-bedded glaciers from hourly to seasonal observations of force budget and basal conditions at Breidamerkurjokull, Iceland.

合作研究：冰岛 Breidamerkurjokull 的软层冰川运动控制，从每小时到季节性的力量预算和基础条件观测。

• 批准号: 0806163
• 负责人: Ian Howat
• 金额: $ 22.2万
• 依托单位: Ohio State University Research Foundation -DO NOT USE
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2008
• 资助国家: 美国
• 起止时间: 2008-12-01 至 2011-11-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0806163&HistoricalAwards=false
• 关键词: Collaborative; Research; Controls; motion; soft

Funds are provided to support a study of the spatial and temporal variability in basal stress regime of Breiðamerkurjökull, a glacier with deformable sediments at its base (a soft-bedded glacier). Soft-bedded ice masses are thought to be particularly sensitive to climate change. Yet, the mechanics of soft-bedded glacier flow remain poorly understood. Current ice sheet and glacier models used to predict future sea level rise rely on largely unconstrained parameterizations of basal shear stress and till rheology, leading to high uncertainties in output. This study will collect and analyze data targeted at elucidating weaknesses in current understanding of soft-bedded glacier motion, thus providing improved quantitative descriptions of the governing physical processes. Taking advantage of Breiðamerkurjökull?s accessibility and long history of observations the principal investigators will assemble an unprecedented array of remote-sensing and field data. These data will resolve variations in the glacier stress regime and basal conditions over a range of spatial and temporal scales. This study will develop new and innovative techniques for inferring basal conditions from observations of surface motion and ice-penetrating radar.

提供的资金用于支持对Brei Ia amerkurjökull冰川(一种底部有可变形沉积物的冰川)基本应力状态的空间和时间变异性的研究。软冰层被认为对气候变化特别敏感。然而，人们对软层冰川流动的机制仍然知之甚少。目前用于预测未来海平面上升的冰盖和冰川模型基本上依赖于基本剪应力和冰川流变学的无约束参数，导致产出的高度不确定性。这项研究将收集和分析数据，旨在阐明目前对软层冰川运动的理解中的弱点，从而改进对主导物理过程的定量描述。主要调查人员将利用布雷加·阿梅尔库尔库？S的可及性和悠久的观测历史，收集前所未有的遥感和实地数据。这些数据将解决一系列空间和时间尺度上冰川应力状况和基本条件的变化。这项研究将开发新的创新技术，从地表运动和冰层穿透雷达的观测中推断基本条件。