Estimation of ice fabric within Whillans Ice Stream using polarimetric phase-sensitive radar sounding
Abstract 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...
Published in: | Annals of Glaciology |
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Language: | English |
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Cambridge University Press (CUP)
2020
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Online Access: | http://dx.doi.org/10.1017/aog.2020.6 https://www.cambridge.org/core/services/aop-cambridge-core/content/view/S0260305520000063 |
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crcambridgeupr:10.1017/aog.2020.6 2024-06-16T07:33:29+00:00 Estimation of ice fabric within Whillans Ice Stream using polarimetric phase-sensitive radar sounding Jordan, Thomas M. Schroeder, Dustin M. Elsworth, Cooper W. Siegfried, Matthew R. 2020 http://dx.doi.org/10.1017/aog.2020.6 https://www.cambridge.org/core/services/aop-cambridge-core/content/view/S0260305520000063 en eng Cambridge University Press (CUP) http://creativecommons.org/licenses/by/4.0/ Annals of Glaciology volume 61, issue 81, page 74-83 ISSN 0260-3055 1727-5644 journal-article 2020 crcambridgeupr https://doi.org/10.1017/aog.2020.6 2024-05-22T12:56:00Z Abstract 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. Article in Journal/Newspaper Annals of Glaciology Antarc* Antarctica Mercer Ice Stream West Antarctica Whillans Ice Stream Cambridge University Press Mercer ENVELOPE(65.647,65.647,-70.227,-70.227) Mercer Ice Stream ENVELOPE(-145.000,-145.000,-84.833,-84.833) West Antarctica Whillans ENVELOPE(-64.250,-64.250,-84.450,-84.450) Whillans Ice Stream ENVELOPE(-145.000,-145.000,-83.667,-83.667) Annals of Glaciology 61 81 74 83 |
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Open Polar |
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Cambridge University Press |
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crcambridgeupr |
language |
English |
description |
Abstract 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. |
format |
Article in Journal/Newspaper |
author |
Jordan, Thomas M. Schroeder, Dustin M. Elsworth, Cooper W. Siegfried, Matthew R. |
spellingShingle |
Jordan, Thomas M. Schroeder, Dustin M. Elsworth, Cooper W. Siegfried, Matthew R. Estimation of ice fabric within Whillans Ice Stream using polarimetric phase-sensitive radar sounding |
author_facet |
Jordan, Thomas M. Schroeder, Dustin M. Elsworth, Cooper W. Siegfried, Matthew R. |
author_sort |
Jordan, Thomas M. |
title |
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_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_sort |
estimation of ice fabric within whillans ice stream using polarimetric phase-sensitive radar sounding |
publisher |
Cambridge University Press (CUP) |
publishDate |
2020 |
url |
http://dx.doi.org/10.1017/aog.2020.6 https://www.cambridge.org/core/services/aop-cambridge-core/content/view/S0260305520000063 |
long_lat |
ENVELOPE(65.647,65.647,-70.227,-70.227) ENVELOPE(-145.000,-145.000,-84.833,-84.833) ENVELOPE(-64.250,-64.250,-84.450,-84.450) ENVELOPE(-145.000,-145.000,-83.667,-83.667) |
geographic |
Mercer Mercer Ice Stream West Antarctica Whillans Whillans Ice Stream |
geographic_facet |
Mercer Mercer Ice Stream West Antarctica Whillans Whillans Ice Stream |
genre |
Annals of Glaciology Antarc* Antarctica Mercer Ice Stream West Antarctica Whillans Ice Stream |
genre_facet |
Annals of Glaciology Antarc* Antarctica Mercer Ice Stream West Antarctica Whillans Ice Stream |
op_source |
Annals of Glaciology volume 61, issue 81, page 74-83 ISSN 0260-3055 1727-5644 |
op_rights |
http://creativecommons.org/licenses/by/4.0/ |
op_doi |
https://doi.org/10.1017/aog.2020.6 |
container_title |
Annals of Glaciology |
container_volume |
61 |
container_issue |
81 |
container_start_page |
74 |
op_container_end_page |
83 |
_version_ |
1802005036001132544 |