Here we use polarimetric measurements from an Autonomous phase-sensitive Radio-Echo Sounder (ApRES) to investigate ice fabric within Whillans Ice Stream, West Antarctica. The survey traverse is bounded at one end by the suture zone with the Mercer Ice Stream and at the other end by a basal ‘sticky spot’. Our data analysis employs a phase-based polarimetric coherence method to estimate horizontal ice fabric properties: the fabric orientation and the magnitude of the horizontal fabric asymmetry. We infer an azimuthal rotation in the prevailing horizontal c-axis between the near-surface (z ≈ 10–50 m) and deeper ice (z ≈ 170–360 m), with the near-surface orientated closer to perpendicular to flow and deeper ice closer to parallel. In the near-surface, the fabric asymmetry increases toward the center of Whillans Ice Stream which is consistent with the surface compression direction. By contrast, the fabric orientation in deeper ice is not aligned with the surface compression direction but is consistent with englacial ice reacting to longitudinal compression associated with basal resistance from the nearby sticky spot.

中文翻译：

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使用极化相敏雷达探测法估计 Whillans 冰流内的冰结构

在这里，我们使用来自自主相敏无线电回波探测仪 (ApRES) 的极化测量来研究南极洲西部 Whillans 冰流内的冰结构。测量导线的一端是与默瑟冰流的缝合带，另一端是一个基底“粘性点”。我们的数据分析采用基于相位的极化相干法来估计水平冰织物特性：织物方向和水平织物不对称的大小。我们推断主导水平方向的方位角旋转C- 近地表之间的轴（z≈ 10–50 m) 和更深的冰层 (z≈ 170–360 m)，近地表更接近垂直于流动，更深的冰更接近平行。在近地表，结构不对称性向惠兰斯冰流中心方向增加，与地表压缩方向一致。相比之下，较深冰中的织物取向与表面压缩方向不一致，但与冰期冰对纵向压缩的反应一致，纵向压缩与附近粘性点的基础阻力相关。