Analysis of Ice-Radar Studies of Basal Conditions and Internal Structure in West Antarctic Ice Streams

本方案为地面数据分析阶段。美国地质调查局和圣奥拉夫学院于1987年7月89日在南极西部冰盖的简单海岸地区进行了基于雷达的研究。这个冰盖的排水在很大程度上是由该地区快速的冰流控制的，这种冰流最近出现了剧烈的变化。1987.88年在冰流b上以5个发射机频率记录了高密度剖面的数字化雷达波形。1988.89年在冰流C上进行了类似的项目，记录了400多Km的剖面，包括剪切边缘区和与俄亥俄州立大学应变网格重合的纵向区域。对这些数据的初步分析表明，它们包含了关于内部分层、埋藏裂缝和地层条件的详细信息。这些信息有助于了解该地区快速冰流动力学和流动历史的本质。这项建议包括1989年10月1日的两年期间。1991年10月1日，第一年与其他研究冰流B和冰流c的小组进行的一些地球物理研究的数据分析阶段相吻合。研究的重点将放在处理和分析过去两个实地季节获得的雷达数据，并将这些信息与其他研究人员获得的数据结合起来，回答关于冰流的一些问题动力学。

This proposal is for the data analysis phase of ground.based radar studies conducted by the U.S. Geological Survey and St. Olaf College in 1987.89 in the Siple Coast region of the West Antarctic Ice Sheet. The drainage of this ice sheet is in large part controlled by fast ice stream flow in this area which recently has shown dramatic change. In 1987.88 digitized radar waveforms were recorded in high density profiles at 5 transmitter frequencies on ice stream B. A similar program was conducted on ice stream C in 1988.89 in which over 400 Km of profiles were recorded, including both shear marginal zones and a longitudinal area coinciding with the Ohio State University strain grid. Preliminary analysis of these data has shown that they contain detailed information about internal layering, buried crevasses, and conditions at the bed . information which can aid in understanding the nature of fast ice stream dynamics and flow history in this area. This proposal covers a two year period October 1, 1989 . October 1, 1991, the first year coinciding with the data analysis phase of a number of geophysical studies conducted by other groups working on ice streams B and C. The focus of the research will be on the processing and analysis of radar data acquired in the past two field seasons and using this information in conjunction with the data obtained by other investigators to answer a number of questions about ice stream dynamics.