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: 0806202
• 负责人: Howard Conway
• 金额: $ 12.48万
• 依托单位: University of Washington
• 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 2012-11-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0806202&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.

提供资金支持对Breiamerkurjökull基底应力状态的空间和时间变化进行研究，Breiamerkurjökull是一个底部有可变形沉积物的冰川（软层冰川）。人们认为，软层冰块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主要依赖于基底剪切应力和冰碛流变学的无约束参数化，导致输出的高度不确定性。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的弱点，从而提供更好的定量描述的管理物理过程。利用布雷西亚默库尔冰川？主要调查人员将收集一系列前所未有的遥感和实地数据。这些数据将解决冰川应力状况和基础条件在一系列空间和时间尺度上的变化。这项研究将开发新的创新技术，从表面运动和冰穿透雷达的观测推断基础条件。