Ice Dynamics, the Flow Law, and Vertical Strain at Siple Dome

该奖项是对一个为期三年的项目的支持，该项目旨在测量南极洲西普穹顶上两个地点的垂直应变率随深度的变化。像Siple Dome这样的分水岭附近的冰流是独一无二的，因为它主要是垂直的。因此，冰变形的分量在垂直方向上，“垂直应变率”占主导地位。因此，它的测量对于冰流动力学模型的校准是很重要的。将使用两种不同的、相对较新的、高分辨率的系统来测量热水钻孔中的温度。由测量和流动规律确定得到的冰流模型将被用来解释雷达内部分层的形状，根据过去10,000年来Siple Dome的动态历史和积累模式。改进后的模型还将用于解释1997/98年野外季节将在Siple Dome钻探的冰芯的年层厚度(以计算年累积率)和钻孔温度。与格陵兰岛中部最近的取心地点相比，这一结果应该能够改进对冰芯的分析。这是阿拉斯加大学、加州大学圣地亚哥分校和华盛顿大学的合作项目。

This award is for support for a three year project to measure the vertical strain rate as a function of depth at two sites on Siple Dome Antarctica. Ice flow near a divide such as Siple Dome is unique in that it is predominantly vertical. As a consequence, the component of ice deformation in the vertical direction, the "vertical strain rate" is dominant. Its measurement is therefore important for the calibration of dynamic models of ice flow. Two different, relatively new, high resolution systems for its measurement in hot water drilled holes will be employed. The ice flow model resulting from the measurements and flow law determination will be used to interpret the shapes of radar internal layering in terms of the dynamic history and accumulation patterns of Siple Dome over the past 10,000 years. The resulting improved model will also be applied to the interpretation of annual layers thicknesses (to produce annual accumulation rates) and borehole temperatures from the ice core to be drilled at Siple Dome during the 1997/98 field season. The results should permit an improved analysis of the ice core, relative to what was possible at recent coring sites in central Greenland. This is a collaborative project between the University of Alaska, the University of California, San Diego and the University of Washington.