Radar Studies of the Bed of an Active Ice Stream

该合同支持南极洲冰流B的地面雷达探测项目，其主要目的是确定冰顶、冰底和床顶之间的运动差。这将通过测量与冰床界面的不规则性有关的衍射（“褪色”）图案相对于表面的运动来完成。可以以1米左右的分辨率测量到的差异运动将归因于冰盖内部的剪切变形和其床上的滑动。它还计划确定钻孔地点选择和应变分析的床地形，监测钻孔水层的横向渗透，研究内部分层，并使用短脉冲高分辨率雷达系统绘制近地表裂缝图。

This award supports a ground-based radar sounding program in Antarctica on Ice Stream B with a primary purpose of determining the differential motion between the top of the ice and the base of the ice and the top of the bed. This will be done by measuring the movement, relative to the surface, of diffraction ("fading") patterns associated with irregularities in the ice-bed interface. Differential motion, which can be measured with a resolution of about 1 meter, will be attributable to shear deformation within the ice sheet and sliding on its bed. It is also planned to determine bed topography for drill-hole site selection and strain analyses, monitor drill holes for lateral penetration of water layers, study internal layering, and map near- surface crevasses using a short-pulse, high-resolution radar system.