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

Siple Dome 处的冰动力学、流动定律和垂直应变

• 批准号: 9615502
• 负责人: William Harrison
• 金额: $ 28.37万
• 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: 1997
• 资助国家: 美国
• 起止时间: 1997-03-01 至 2002-12-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9615502&HistoricalAwards=false
• 关键词: Ice; Dynamics; Flow; Law; Vertical

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.

该奖项用于支持一个为期三年的项目，该项目旨在测量南极洲 Siple Dome 两个地点的垂直应变率与深度的函数关系。 像 Siple Dome 这样的分水岭附近的冰流是独特的，因为它主要是垂直的。 因此，冰变形在垂直方向的分量，即“垂直应变率”占主导地位。 因此，它的测量对于冰流动态模型的校准非常重要。 将采用两种不同的、相对较新的高分辨率系统在热水钻孔中进行测量。 通过测量和确定流动规律得出的冰流模型将用于根据 Siple Dome 在过去一万年的动态历史和积累模式来解释雷达内部分层的形状。 由此产生的改进模型还将应用于解释 1997/98 野外季节期间在 Siple Dome 钻探的冰芯的年层厚度（以产生年积累率）和钻孔温度。 相对于格陵兰岛中部最近的取芯地点，这些结果应该可以改进对冰芯的分析。 这是阿拉斯加大学、加州大学圣地亚哥分校和华盛顿大学之间的合作项目。