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

基本信息

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

项目摘要

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.

该奖项支持利用数值模拟和卫星遥感罗斯冰架上的流动特征相结合，对过去一千年罗斯冰流的抛物变化进行调查。拟议的合作研究将利用罗斯冰架的流量变化记录来推断过去 1000 年冰流流量的变化。冰流流量的变化以深刻而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。结果是冰架内冰的生命周期中许多变化的综合记录。 Fahnestock 等人对流迹和裂缝几何形状的解释将用作数值模拟实验设计的模板。主要目标是验证图像衍生的历史并量化该历史暗示的体积通量。拟议的研究将改进冰流流量变化的现有概念，并将产生新的数据集，这两者都将对南极冰川学界有用。 Landsat-7 图像将用于测量现有数据不足的特别感兴趣区域的速度。 MODIS数据具有更好的辐射和空间分辨率，将用于改善敏感区域冰架的特征映射。