Origin and Implications of Small Scale Surface Topography on Siple Coast Ice Streams

单层海岸冰流小尺度地表地形的起源和影响

• 批准号: 9526707
• 负责人: Charles Raymond
• 金额: $ 12.88万
• 依托单位: University of Washington
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 1996
• 资助国家: 美国
• 起止时间: 1996-01-01 至 2001-12-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9526707&HistoricalAwards=false
• 关键词: Origin; Implications; Small; Scale; Surface

This award is for support to develop a time dependent analytical theory of three-dimensional glacier flow perturbations caused by small bedrock undulations and/or variation in basal resistance. The theory will be used to analyze data from the Siple Coast ice streams. The main objectives of the work will be: 1) to elucidate the cause of a number of observed surface undulations and local variation in the surface velocity field of Ice Stream D, and 2) to analyze theoretically the time scales associated with the buildup and decay of surface undulations and to test those theoretical concepts against measurements of surface and bedrock undulations from Ice Stream C. These objectives contribute to understanding how spatial variations in topography and resistance to slipping contribute to the support of the ice streams, the control of their speeds and their influence on changes in discharge from the West Antarctic ice sheet to the ocean. This work will be done in conjunction with NASA- Goddard Space Flight Center (Robert A. Bindschadler).

该奖项是为了支持开发由小型基岩波动和/或基岩阻力变化引起的三维冰川流动扰动的时间依赖分析理论。该理论将用于分析简单海岸冰流的数据。这项工作的主要目标是：1)阐明D冰流表面速度场若干观测到的地表波动和局部变化的原因；2)从理论上分析与地表波动形成和衰减相关的时间尺度，并根据冰流c测量的地表和基岩波动来检验这些理论概念。这些目标有助于理解地形和滑动阻力的空间变化如何有助于冰流的支撑。对其速度的控制及其对南极西部冰盖向海洋的流量变化的影响。这项工作将与美国宇航局戈达德太空飞行中心（Robert A. Bindschadler）共同完成。