Studying Byrd Glacier as a Rock-Floored Ice Stream Ending as a Calving Ice Shelf: Phase I

研究伯德冰川作为一条覆盖岩石的冰流，最终形成崩解的冰架：第一阶段

• 批准号: 0003616
• 负责人: Terence Hughes
• 金额: $ 7.98万
• 依托单位: University of Maine
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2001
• 资助国家: 美国
• 起止时间: 2001-02-15 至 2003-01-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0003616&HistoricalAwards=false
• 关键词: Studying; Byrd; Glacier; Rock; Floored

0003616HughesThis award supports a one-year study of the floating part of Byrd Glacier, from its grounding line located halfway up a fjord through the Transantarctic Mountains to the end of its lateral rift zone on the Ross Ice Shelf beyond the fjord. Over this l00 km distance, the side boundary changes from rigid between the fjord sidewalls, to nearly free in the lateral rift zone, to deforming when the rifts are healed and Bryd Glacier becomes fully coupled to the Ross Ice Shelf. The stress field for these changing conditions will be calculated a using a gridpoint finite-element model for the Ross Ice Shelf (Thomas and MacAyeal, l982) and a flowband finite-difference model for smooth transitions from sheet flow to stream flow to shelf flow (Hughes, l998). Results of the two modeling approaches will be compared, using existing ice elevation and velocity data obtained from aerial photogrammetry, our unpublished surface mass balance data, and new velocity data obtained from Landsat imagery by the U. S. Geological Survey. This study will train one graduate student at the Masters level.

0003616休斯该奖项支持对伯德冰川漂浮部分进行为期一年的研究，从位于峡湾中部的接地线穿过横贯南极山脉，到峡湾外罗斯冰架上的横向裂谷带的末端。 在这100公里的距离，侧边界的变化，从刚性之间的峡湾侧壁，几乎自由的横向裂谷带，变形时，裂谷愈合和布赖德冰川成为完全耦合到罗斯冰架。 将使用罗斯冰架的网格点有限元模型（托马斯和MacAyeal，1982年）和从薄层流到溪流流再到冰架流的平滑过渡的流带有限差分模型（Hughes，1998年）计算这些变化条件下的应力场。 两种建模方法的结果将进行比较，使用现有的冰高程和速度数据从航空摄影测量，我们未发表的表面质量平衡数据，并从美国陆地卫星图像获得的新的速度数据。S.地质调查局。这项研究将培养一名硕士研究生。