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
• 负责人: Keith Echelmeyer
• 金额: $ 40.24万
• 依托单位: University of Alaska Fairbanks Campus
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 1988
• 资助国家: 美国
• 起止时间: 1988-05-01 至 1992-04-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=8722003&HistoricalAwards=false
• 关键词: Determination; Mechanisms; Rapid; Flow; JakobshavnsGlacier

In order to determine the mechanisms for rapid ice stream flow, this project will drill several boreholes to the base of Jakobshavns Glacier, Greenland. Borehole measurements of internal deformation, basal water pressure, ice temperature and electrical conductivity at the bed will be combined with short-period measurements of the surface velocity to provide a firm basis for establishing the mechanisms which govern the flow of this fast moving ice stream. Ice core sampling at selected depths within the borehole and sampling of the glacier bed will be undertaken to determine the physical properties and structure of the ice and any existing subglacial material and the role which these properties play in determining the rapid flow of the ice stream. Water transport at the glacier bed will be investigated by following the flow and dispersion of borehole salt injections using electrical conductivity methods. This project is a fully collaborative effort with ETH, Zurich, Switzerland.

为了确定冰流快速流动的机制，该项目将在格陵兰岛雅各布肖夫斯冰川底部钻几个钻孔。对床上内部变形、基本水压、冰温和电导率的钻孔测量将与表面速度的短期测量相结合，为建立支配这种快速移动的冰流的机制提供坚实的基础。将在钻孔内选定深度进行冰芯取样和冰川床取样，以确定冰和任何现有冰下物质的物理性质和结构，以及这些性质在确定冰流快速流动方面所起的作用。将通过使用电导法跟踪钻孔注盐的流动和扩散来研究冰川床上的水传输。该项目是与瑞士苏黎世ETH充分合作的成果。