Collaborative Research: Discharge Variability of Ross Ice Streams Over the Last Millenium, Deduced by Numerical Simulation of Flow Features in the Ross Ice Shelf

该奖项支持对罗斯冰架流量特征的数值模拟和卫星遥感相结合，在过去一千年中对罗斯冰流排放变化的研究。拟议的合作研究将利用罗斯冰架的流量变异性记录来推断过去1000年来冰流流量的变化。冰流流量的变化以深刻和微妙的方式扰乱了冰架的流动，扭曲了流动特征并改变了裂缝模式。其结果是对冰架内冰的整个生命周期中许多变化的综合记录。法内斯托克等人对流动轨迹和裂缝几何形状的解释将被用作设计数值模拟实验的模板。主要目标是验证图像衍生的历史，并量化该历史所隐含的体积通量。拟议的研究将改进冰流流量变异性的现有概念，并将产生新的数据集，这两项数据集都将对南极冰川学界有用。陆地卫星7号的图像将用于在现有数据不足的特别感兴趣的地区测量速度。MODIS数据具有更好的辐射分辨率和空间分辨率，可用于改善敏感地区冰架的特征制图。

This award supports the investigation of the dishcarge variability of Ross Ice Streams over the last millenium, using a combination of numerical simulation and satellite remote sensing of flow features on the Ross Ice Shelf. The proposed collaborative research will use the Ross Ice Shelf record of flow variability to deduce variations in ice stream discharge over the last 1000 years. Changes in ice stream discharge disrupt flow of the ice shelf, in both profound and subtle ways, distorting flow features and changing creavasse patterns. The result is an integrated record of many changes over the lifetime of the ice within the shelf. Interpretations of flow-trace and crevasse geometry already made by Fahnestock and others will be used as a template for the design of numerical modeling experiments. The primary objectives are to verify the imagery-derived history and to quantify the volume flux implied by that history. The proposed research will improve existing concepts of ice stream discharge variability and will produce new data sets, both of which will be of use to the Antarctic glaciology community. Landsat-7 imagery will be used to measure velocity in areas of particular interest where existing data are inadequate. MODIS data, which has better radiometric and spatial resolution will be used to improve feature mapping on the ice shelf in sensitive areas.