Estimation of ice fabric within Whillans Ice Stream using polarimetric phase-sensitive radar sounding
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 s...
| Main Authors: | , , , |
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| Format: | Article |
| Language: | English |
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Cambridge University Press
2020-04-01
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| Series: | Annals of Glaciology |
| Subjects: | |
| Online Access: | https://www.cambridge.org/core/product/identifier/S0260305520000063/type/journal_article |
| _version_ | 1811157306414465024 |
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| author | Thomas M. Jordan Dustin M. Schroeder Cooper W. Elsworth Matthew R. Siegfried |
| author_facet | Thomas M. Jordan Dustin M. Schroeder Cooper W. Elsworth Matthew R. Siegfried |
| author_sort | Thomas M. Jordan |
| collection | DOAJ |
| description | 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. |
| first_indexed | 2024-04-10T05:03:56Z |
| format | Article |
| id | doaj.art-a099c7635758466585bce37be0f0d791 |
| institution | Directory Open Access Journal |
| issn | 0260-3055 1727-5644 |
| language | English |
| last_indexed | 2024-04-10T05:03:56Z |
| publishDate | 2020-04-01 |
| publisher | Cambridge University Press |
| record_format | Article |
| series | Annals of Glaciology |
| spelling | doaj.art-a099c7635758466585bce37be0f0d7912023-03-09T12:27:39ZengCambridge University PressAnnals of Glaciology0260-30551727-56442020-04-0161748310.1017/aog.2020.6Estimation of ice fabric within Whillans Ice Stream using polarimetric phase-sensitive radar soundingThomas M. Jordan0https://orcid.org/0000-0002-2096-8858Dustin M. Schroeder1Cooper W. Elsworth2https://orcid.org/0000-0002-6420-7794Matthew R. Siegfried3https://orcid.org/0000-0002-0868-4633Department of Geophysics, Stanford University, USA School of Geographical Sciences, University of Bristol, UKDepartment of Geophysics, Stanford University, USA Department of Electrical Engineering, Stanford University, USADepartment of Geophysics, Stanford University, USADepartment of Geophysics, Stanford University, USA Department of Geophysics, Colorado School of Mines, USAHere 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.https://www.cambridge.org/core/product/identifier/S0260305520000063/type/journal_articleAnisotropic iceradio-echo soundingice crystal studiesice streams |
| spellingShingle | Thomas M. Jordan Dustin M. Schroeder Cooper W. Elsworth Matthew R. Siegfried Estimation of ice fabric within Whillans Ice Stream using polarimetric phase-sensitive radar sounding Annals of Glaciology Anisotropic ice radio-echo sounding ice crystal studies ice streams |
| title | Estimation of ice fabric within Whillans Ice Stream using polarimetric phase-sensitive radar sounding |
| title_full | Estimation of ice fabric within Whillans Ice Stream using polarimetric phase-sensitive radar sounding |
| title_fullStr | Estimation of ice fabric within Whillans Ice Stream using polarimetric phase-sensitive radar sounding |
| title_full_unstemmed | Estimation of ice fabric within Whillans Ice Stream using polarimetric phase-sensitive radar sounding |
| title_short | Estimation of ice fabric within Whillans Ice Stream using polarimetric phase-sensitive radar sounding |
| title_sort | estimation of ice fabric within whillans ice stream using polarimetric phase sensitive radar sounding |
| topic | Anisotropic ice radio-echo sounding ice crystal studies ice streams |
| url | https://www.cambridge.org/core/product/identifier/S0260305520000063/type/journal_article |
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