Collaborative Research: Ice-flow history of the Thwaites Glacier, West Antarctica

合作研究：南极洲西部思韦茨冰川的冰流历史

• 批准号: 0739654
• 负责人: Ginny Catania
• 金额: $ 36.41万
• 依托单位: University of Texas at Austin
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 2008
• 资助国家: 美国
• 起止时间: 2008-06-01 至 2013-05-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0739654&HistoricalAwards=false
• 关键词: Collaborative; Research; Ice; flow; history

Catania 0739654This award supports a project to study the Amundsen Sea drainage system and improve understanding of the impact of recent glaciological changes as an aid to predicting how this region will change in the future. The intellectual merit of the work is that the Amundsen Sea drainage system has been a recent focus for glaciological research because of rapid changes occurring there as a result of grounding line retreat. The work will focus on the regions of flow transition and will map the internal stratigraphy of the ice sheet across the Thwaites Glacier shear margins and use the age and geometry of radar-detected internal layers to interpret ice flow history. Thwaites Glacier (one of the main pathways for ice drainage in the region) has recently widened and may continue to do so in the near future. Thwaites Glacier may be particularly vulnerable to grounding line retreat because it lacks a well-defined subglacial channel. The subglacial environment exerts strong control on ice flow and flow history will be mapped in the context of bed topography and bed reflectivity. The plan is to use existing ice-penetrating radar data and coordinate with planned upcoming surveys to reduce logistical costs. The work proposed here will take three years to complete but no additional fieldwork in Antarctica is required. More detailed ground-based geophysical (radar and seismic) experiments will be needed at key locations to achieve our overall goal and the work proposed here will aid in identifying those regions. The broader impacts of the project are that it will initiate a new collaboration among radar communities within the US including those that are on the forefront of radar systems engineering and those that are actively involved in radar-derived internal layer and bed analysis. The project will also provide support for a postdoctoral researcher and a graduate student, thus giving them exposure to a variety of methodologies and scientific issues. Finally, there are plans to further develop the "Wired Antarctica" website designed by Ginny Catania with the help of a student-teacher. This will allow for the existing lesson plans to be updated to Texas State standards so that they can be used more broadly within state middle and high schools.

卡塔尼亚 0739654该奖项支持一个研究阿蒙森海排水系统的项目，并提高对近期冰川变化影响的了解，以帮助预测该地区未来将如何变化。 这项工作的智力价值在于，阿蒙森海排水系统一直是冰川学研究的近期焦点，因为接地线后退导致那里发生了迅速的变化。 这项工作将重点关注水流转变区域，绘制思韦茨冰川剪切边缘冰盖的内部地层图，并利用雷达检测到的内部层的年龄和几何形状来解释冰流历史。思韦茨冰川（该地区排冰的主要通道之一）最近已拓宽，并且在不久的将来可能会继续扩大。思韦茨冰川可能特别容易受到接地线退缩的影响，因为它缺乏明确的冰下通道。 冰下环境对冰流施加强有力的控制，并且将在河床地形和河床反射率的背景下绘制冰流历史图。 该计划是利用现有的透冰雷达数据，并与计划中的即将进行的调查相协调，以降低后勤成本。这里提议的工作将需要三年时间才能完成，但不需要在南极洲进行额外的实地考察。 为了实现我们的总体目标，需要在关键地点进行更详细的地面地球物理（雷达和地震）实验，这里提出的工作将有助于识别这些区域。 该项目更广泛的影响在于，它将在美国雷达界之间发起新的合作，包括那些处于雷达系统工程最前沿的机构以及那些积极参与雷达衍生的内层和地床分析的机构。该项目还将为博士后研究员和研究生提供支持，从而使他们接触到各种方法和科学问题。最后，计划在一名师生的帮助下进一步开发由金妮·卡塔尼亚设计的“有线南极洲”网站。这将使现有的课程计划更新为德克萨斯州标准，以便它们可以在州立初中和高中中更广泛地使用。