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

0003616 hughes这个奖项支持了一项为期一年的关于伯德冰川漂浮部分的研究，从位于横跨南极山脉的峡湾中部的接地线到峡湾外罗斯冰架上的横向裂谷带的末端。在这100公里的距离内，峡湾侧壁之间的侧边边界从刚性转变为在侧裂谷区几乎自由，当裂谷愈合，布莱德冰川与罗斯冰架完全耦合时，侧边边界发生了变形。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）和从板流到流到冰架流的平滑过渡的流带有限差分模型（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高程和速度数据，我们未发表的表面质量平衡数据，以及美国地质调查局从Landsat图像获得的新速度数据。这项研究将培养一名硕士水平的研究生。

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approaches will be compared, using existing ice elevation and velocity data obtained from aerial photogrammetry, our unpublished surface mass balance data, and new velocity data obtained from Landsat imagery by the U. S. Geological Survey.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