Determination of the Mechanisms of Rapid Flow in JakobshavnsGlacier, Greenland, by Borehole Measurements

为了确定快速冰流流动的机制， 该项目将钻几个钻孔的基础上， 雅各布斯冰川，格陵兰岛。 内部钻孔测量 变形、基底水压力、冰温和电 床层的电导率将与短周期 表面速度的测量，以提供坚实的基础， 建立管理这种快速流动的机制， 移动的冰流 冰芯取样在选定深度内 将对冰川床进行钻孔和取样， 确定冰的物理性质和结构， 现有的冰下物质以及这些特性 在决定冰流的快速流动方面发挥作用。 水 在冰川床的运输将调查以下 利用电的钻孔盐注入的流动和分散 电导率法 这个项目是一个完全合作的 与瑞士苏黎世的ETH合作。

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.