Glaciological Characteristics of the Ross/Amundsen Sea Ice-flow Divide Deduced by a New Analysis of Ice-penetrating Radar Data

透冰雷达数据的新分析推导出罗斯/阿蒙森海冰流分水岭的冰川学特征

• 批准号: 0338151
• 负责人: Charles Raymond
• 金额: --
• 依托单位: University of Washington
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2004
• 资助国家: 美国
• 起止时间: 2004-05-01 至 2010-04-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0338151&HistoricalAwards=false
• 关键词: Glaciological; Characteristics; Ross; Amundsen; Sea

This award supports an investigation of spatial variations of ice temperature and subglacial conditions using available ice-penetrating radar data around a future deep ice coring site near the Ross and Amundsen flow divide of West Antarctic Ice Sheet. Besides geometry of reflection layers the focus will be on intensities of radar echoes from within ice deeper than several hundred meters and will also examine echoes from the bed. Preliminary studies on theory and comparison with Japanese radar data from East Antarctica suggest that large spatial variations of the vertical gradient of radar echoes from within ice exist and are caused primarily by ice temperature and secondarily by crystal-orientation fabric. The hypothesis that the vertical gradient is a proxy of ice temperature will be tested. The project will utilize an existing data set from the Support Office for Aerogeophysical Research in Antarctica (SOAR) and will complement work already underway at University of Texas to analyze the radar data. The project will provide undergraduate research experience with an emphasis on computer analysis of time series and large data sets as well as development of web-based resource of results and methods and will support an international collaboration between US and Japan through discussions on the preliminary results from their study sites. Practical procedures developed through this study will be downloadable from the project's web site in the third year and will allow investigation of other ice sheets using existing radar data sets. This project will contribute to the interpretation of the future inland West Antarctic ice core and will help in the understanding of ice sheet history and climate change.

该奖项支持的冰温度和冰下条件的空间变化的调查，使用现有的冰穿透雷达数据周围的未来深冰取芯网站附近的罗斯和阿蒙森流分水岭西南极冰盖。除了反射层的几何形状外，重点将放在几百米深的冰内雷达回波的强度上，还将检查来自冰床的回波。 理论上的初步研究和与日本东南极雷达数据的比较表明，冰内雷达回波的垂直梯度存在较大的空间变化，主要是由冰温引起的，其次是由晶体取向结构引起的。 将检验垂直梯度是冰温代表的假设。 该项目将利用南极航空地球物理研究支持办公室（SOAR）的现有数据集，并将补充德克萨斯大学已经在进行的雷达数据分析工作。 该项目将提供本科生的研究经验，重点是时间序列和大型数据集的计算机分析，以及基于网络的结果和方法资源的开发，并将通过讨论其研究地点的初步结果来支持美国和日本之间的国际合作。 通过这项研究制定的实用程序将在第三年从该项目的网站上下载，并将允许使用现有的雷达数据集调查其他冰盖。 该项目将有助于解释未来的内陆西南极冰芯，并将有助于了解冰盖的历史和气候变化。