Using Spatial and Temporal Variations of Ice Deformation to Study Basal Processes

利用冰变形的时空变化来研究基础过程

基本信息

  • 批准号:
    0115819
  • 负责人:
  • 金额:
    $ 27.42万
  • 依托单位:
  • 依托单位国家:
    美国
  • 项目类别:
    Standard Grant
  • 财政年份:
    2001
  • 资助国家:
    美国
  • 起止时间:
    2001-11-01 至 2004-10-31
  • 项目状态:
    已结题

项目摘要

Abstract EchelmeyerOPP-01-15819 The Principal Investigators will study the distribution of basal shear stress and basal motion through detailed monitoring of surface velocities and internal ice deformation. The hypothesis is that the distribution of basal stress is related to the internal deformation field, and that temporal changes in basal conditions manifest themselves not only as changes in surface motion, but as changes in internal deformation. Such changes in internal deformation can be relatively large given the non-linear rheology of ice and the sensitivity of basal processes to variations in effective pressure. The Principal Investigators will investigate the mechanisms of basal motion using these ideas on Black Rapids Glacier, Alaska. They have previously documented the presence of a subglacial till layer and have some knowledge of its properties. Observational and modeling studies have shown that water pressure fluctuations cause changes in the strength of this till, and that these spatial and temporal changes in basal conditions then lead to measurable changes in the ice deformation field. Six boreholes will be drilled along a cross section where the till exists, and a seventh will be drilled further downglacier. They will be instrumented with tilt sensors for continuous monitoring of borehole deformation and with pressure transducers for monitoring basal water pressure. They will also measure surface velocities across the transects, and their temporal fluctuations. The observational study will be initiated before the annual spring speed-up event and carried through the summer, when various motion events occur. Logging will then continue through the more steady conditions of the winter season. A finite element model of ice deformation will then be used to interpret these data in terms of the distribution of basal shear stress and the underlying mechanisms of basal motion throughout the annual cycle. The proposed project will take full advantage of synergetic collaboration with an existing, funded program to install tilt sensors deep in the underlying basal till at the same location as our central borehole. Taken together, the Principal Investigators will be able to obtain a more complete picture of basal processes and of the interdependence of basal motion and ice deformation. Such interdependence is usually neglected in simple models of ice flow and the response of glaciers to climate variations.
EchelmeyerOPP-01-15819首席调查员将通过详细监测海面速度和内部冰的变形来研究基面切应力和基面运动的分布。假设基本应力的分布与内部变形场有关,基本条件的时间变化不仅表现为地表运动的变化,而且表现为内部变形的变化。考虑到冰的非线性流变性和基本过程对有效压力变化的敏感性,内部变形的这种变化可能相对较大。首席调查人员将利用这些想法在阿拉斯加的黑色急流冰川上研究基本运动的机制。他们之前记录了冰下耕层的存在,并对其性质有了一些了解。观测和模拟研究表明,水压波动引起冰层强度的变化,这些基本条件的时空变化随后导致冰形变场的可测量变化。将在冰柜所在的横截面上钻六个孔,第七个孔将在冰川下游进一步钻。它们将配备倾斜传感器,用于连续监测井眼变形,并配备压力传感器,用于监测基础水压力。他们还将测量横断面上的表面速度及其时间波动。观测研究将在一年一度的春季加速事件之前启动,并在夏季各种运动事件发生时进行。然后,伐木将在冬季更稳定的条件下继续进行。然后,将使用冰变形的有限元模型来解释这些数据,解释其在整个年度周期中的基本剪应力分布和基本运动机制。拟议的项目将充分利用与现有资助计划的协同合作,在底层底部深处安装倾斜传感器,并在与中心钻孔相同的位置安装倾斜传感器。总而言之,首席调查人员将能够对基本过程以及基本运动和冰变形的相互依赖获得更完整的图景。在简单的冰流模型和冰川对气候变化的反应中,这种相互依赖通常被忽视。

项目成果

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Keith Echelmeyer其他文献

Keith Echelmeyer的其他文献

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{{ truncateString('Keith Echelmeyer', 18)}}的其他基金

Glacier Changes in Western North America: Effects on Sea Level and Climatic Implications
北美西部冰川变化:对海平面的影响和气候影响
  • 批准号:
    0327067
  • 财政年份:
    2003
  • 资助金额:
    $ 27.42万
  • 项目类别:
    Standard Grant
International Symposium on Fast Glacier Flow
快速冰川流国际研讨会
  • 批准号:
    0119714
  • 财政年份:
    2001
  • 资助金额:
    $ 27.42万
  • 项目类别:
    Standard Grant
Fireweed Rock Glacier: Geophysical Survey and Flow Modeling
火草岩冰川:地球物理调查和流动模拟
  • 批准号:
    9806648
  • 财政年份:
    1998
  • 资助金额:
    $ 27.42万
  • 项目类别:
    Standard Grant
A New Concept in Glacier Mass Balance
冰川质量平衡的新概念
  • 批准号:
    9707515
  • 财政年份:
    1997
  • 资助金额:
    $ 27.42万
  • 项目类别:
    Continuing Grant
Volume Changes of McCall Glacier, Alaska, in Response to Climatic Warming in the Arctic
阿拉斯加麦考尔冰川的体积变化对北极气候变暖的反应
  • 批准号:
    9214954
  • 财政年份:
    1992
  • 资助金额:
    $ 27.42万
  • 项目类别:
    Continuing Grant
Geophysical Investigation of Seasonal Changes in the Basal Zone of Black Rapids Glaciers, Alaska
阿拉斯加黑急流冰川基底带季节变化的地球物理调查
  • 批准号:
    9122783
  • 财政年份:
    1992
  • 资助金额:
    $ 27.42万
  • 项目类别:
    Continuing Grant
Determination of the Mechanisms of Rapid Flow in JakobshavnsGlacier, Greenland, by Borehole Measurements
通过钻孔测量确定格陵兰岛雅各布港冰川快速流动的机制
  • 批准号:
    8722003
  • 财政年份:
    1988
  • 资助金额:
    $ 27.42万
  • 项目类别:
    Continuing Grant
"Glaciological Studies of the Jokobshanvns Glacier, Greeland"
“格陵兰 Jokobshanvns 冰川的冰川学研究”
  • 批准号:
    8406818
  • 财政年份:
    1984
  • 资助金额:
    $ 27.42万
  • 项目类别:
    Continuing Grant

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