Detection of Crystal Orientation Fabrics near the Ross/Amundsen Sea Ice-flow Divide and at the Siple Dome Ice Core Site using Polarimetric Radar Methods

使用偏振雷达方法检测罗斯/阿蒙森海冰流分水岭附近和 Siple Dome 冰芯位置的晶体取向织物

• 批准号: 0440847
• 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: 2005
• 资助国家: 美国
• 起止时间: 2005-06-15 至 2011-05-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0440847&HistoricalAwards=false
• 关键词: Detection; Crystal; Orientation; Fabrics; near

This award supports a project to investigate fabrics with ground-based radar measurements near the Ross/Amundsen Sea ice-flow divide where a deep ice core will be drilled. The alignment of crystals in ice (crystal-orientation fabric) has an important effect on ice deformation. As ice deforms, anisotropic fabrics are produced, which, in turn, influence further deformation. Measurement of ice fabric variations can help reveal the deformation history of the ice and indicate how the ice will deform in the future. Ice cores provide opportunities to determine a vertical fabric profile, but horizontal variations of fabrics remain unknown. Remote sensing with ice-penetrating radar is the only way to do that over large areas. Preliminary results show that well-established polarimetric methods can detect the degree of horizontal anisotropy of fabrics and their orientation, even when they are nearly vertical-symmetric fabrics. In conjunction with ice deformation history, our first mapping of ice fabrics will contribute to modeling ice flow near the future ice core site. The project will train a graduate student and provide research experiences for two under graduate students both in field and laboratory. The project will contribute to ongoing West Antarctic ice sheet program efforts to better understand the impact of the ice sheet on global sea level rise. This project also supports an international collaboration between US and Japanese scientists.

该奖项支持一个项目，该项目在罗斯/阿蒙森海冰流分水岭附近使用地面雷达测量来调查织物，在那里将钻取一个深冰芯。冰(晶体取向组构)中的晶体取向对冰的变形有重要影响。当冰变形时，会产生各向异性的织物，进而影响进一步的变形。对冰组构变化的测量有助于揭示冰的变形历史，并指示冰未来将如何变形。冰芯提供了确定垂直面料轮廓的机会，但面料的水平变化仍然未知。使用穿透冰层的雷达进行遥感是在大范围内做到这一点的唯一方法。初步结果表明，成熟的偏振方法可以检测织物的水平各向异性程度和它们的取向，即使它们是几乎垂直对称的织物。结合冰的变形历史，我们的第一张冰组构地图将有助于对未来冰核附近的冰流进行建模。该项目将培养一名研究生，并为两名本科生提供实地和实验室的研究经验。该项目将有助于正在进行的西南极冰盖计划努力，以更好地了解冰盖对全球海平面上升的影响。该项目还支持美国和日本科学家之间的国际合作。