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

合作研究：罗斯冰架流动特征数值模拟推导近千年罗斯冰流流量变化

• 批准号: 0003490
• 负责人: Mark Fahnestock
• 金额: $ 8.05万
• 依托单位: University of Maryland, College Park
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 2001
• 资助国家: 美国
• 起止时间: 2001-02-01 至 2002-06-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0003490&HistoricalAwards=false
• 关键词: Collaborative; Research; Discharge; Variability; Ross

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.

该奖项支持罗斯冰流在过去的千年discarge变化的调查，使用数值模拟和罗斯冰架上的流动特征的卫星遥感相结合。 拟议的合作研究将使用罗斯冰架流量变化记录来推断过去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creavasse模式。 其结果是一个完整的记录，许多变化的生命周期内的冰在大陆架。 Fahnestock和其他人对水流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。 主要目的是验证图像导出的历史，并量化该历史所暗示的体积通量。 拟议的研究将改进现有的冰流排放变化概念，并将产生新的数据集，这两个数据集都将对南极冰川学界有用。 大地卫星7号图像将用于测量现有数据不足的特别感兴趣地区的速度。 中分辨率成像分光仪数据具有更好的辐射和空间分辨率，将用于改进敏感地区冰架的特征测绘。