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

该奖项支持对伯德冰川漂浮部分进行为期一年的研究，从横穿北极山脉的峡湾中途的接地线到峡湾以外的罗斯冰架上的横向裂隙带的末端。在这100公里的距离内，侧界从峡湾侧壁之间的刚性，到横向裂隙带的近自由，到裂隙愈合时的变形，以及Bryd冰川与罗斯冰架的完全耦合。这些变化条件下的应力场将使用罗斯冰架的网格点有限元模型(Thomas和MacAyeal，1982)和从板流到溪流再到陆架流平滑过渡的流动带有限差分模型(Hughes，1998)来计算。两种建模方法的结果将进行比较，使用从航空摄影测量获得的现有冰面高度和速度数据、我们未公布的表面质量平衡数据以及美国地质调查局从陆地卫星图像获得的新速度数据。这项研究将培养一名硕士研究生。

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approaches will be compared, using existing ice elevation and velocity data obtained from aerial photogrammetry, our unpublished surface mass balance data, and new velocity data obtained from Landsat imagery by the U. S. Geological Survey.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.