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：
0242465
负责人：
Mark Fahnestock
金额：
$ 6.34万
依托单位：
University of New Hampshire
依托单位国家：
美国
项目类别：
Continuing Grant
财政年份：
2002
资助国家：
美国
起止时间：
2002-05-01 至 2004-02-29
项目状态：
已结题

来源：
https://www.nsf.gov/awardsearch/showAward?AWD_ID=0242465&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.

该奖项支持了在上一个千年中对罗斯冰流的烟气变异性的调查，使用了数值模拟和卫星遥感流量在罗斯冰架上的遥感。拟议的合作研究将使用Ross Ice架的流量变异性记录来推断过去1000年的冰流分泌物的变化。冰流排放的变化以深刻和微妙的方式破坏了冰架的流动，使流动特征和变化的creavasse模式变化。结果是在架子内冰的一生中发生了许多变化的集成记录。 Fahnestock和其他的流程跟踪和裂缝几何形状的解释将被用作设计数值建模实验的模板。主要目标是验证图像衍生的历史记录并量化该历史所隐含的体积通量。拟议的研究将改善冰流排放变异性的现有概念，并将产生新的数据集，这两个数据集将用于南极冰川学界。 Landsat-7图像将用于测量现有数据不足的特殊区域的速度。 MODIS数据（具有更好的辐射测量值和空间分辨率）将用于改善敏感区域的冰架上的特征映射。