期刊
ANNALS OF GLACIOLOGY
卷 61, 期 81, 页码 74-83出版社
CAMBRIDGE UNIV PRESS
DOI: 10.1017/aog.2020.6
关键词
Anisotropic ice; radio-echo sounding; ice crystal studies; ice streams
资金
- EU Horizons 2020 grant [747336-BRISRES-H2020-MSCA-IF-2016]
- NSF CAREER award
- NSF as part of the SALSA project [ANT-1543441]
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 horizontalc-axis between the near-surface (z approximate to 10-50 m) and deeper ice (z approximate to 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.
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