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...
Published in: | Annals of Glaciology |
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Cambridge University Press
2020
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ftdoajarticles:oai:doaj.org/article:a099c7635758466585bce37be0f0d791 2023-05-15T13:29:36+02:00 Estimation of ice fabric within Whillans Ice Stream using polarimetric phase-sensitive radar sounding Thomas M. Jordan Dustin M. Schroeder Cooper W. Elsworth Matthew R. Siegfried 2020-04-01T00:00:00Z https://doi.org/10.1017/aog.2020.6 https://doaj.org/article/a099c7635758466585bce37be0f0d791 EN eng Cambridge University Press https://www.cambridge.org/core/product/identifier/S0260305520000063/type/journal_article https://doaj.org/toc/0260-3055 https://doaj.org/toc/1727-5644 doi:10.1017/aog.2020.6 0260-3055 1727-5644 https://doaj.org/article/a099c7635758466585bce37be0f0d791 Annals of Glaciology, Vol 61, Pp 74-83 (2020) Anisotropic ice radio-echo sounding ice crystal studies ice streams Meteorology. Climatology QC851-999 article 2020 ftdoajarticles https://doi.org/10.1017/aog.2020.6 2023-03-12T01:31:55Z 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 Directory of Open Access Journals: DOAJ Articles 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 |
institution |
Open Polar |
collection |
Directory of Open Access Journals: DOAJ Articles |
op_collection_id |
ftdoajarticles |
language |
English |
topic |
Anisotropic ice radio-echo sounding ice crystal studies ice streams Meteorology. Climatology QC851-999 |
spellingShingle |
Anisotropic ice radio-echo sounding ice crystal studies ice streams Meteorology. Climatology QC851-999 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 |
topic_facet |
Anisotropic ice radio-echo sounding ice crystal studies ice streams Meteorology. Climatology QC851-999 |
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. |
format |
Article in Journal/Newspaper |
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 |
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 |
publishDate |
2020 |
url |
https://doi.org/10.1017/aog.2020.6 https://doaj.org/article/a099c7635758466585bce37be0f0d791 |
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, Vol 61, Pp 74-83 (2020) |
op_relation |
https://www.cambridge.org/core/product/identifier/S0260305520000063/type/journal_article https://doaj.org/toc/0260-3055 https://doaj.org/toc/1727-5644 doi:10.1017/aog.2020.6 0260-3055 1727-5644 https://doaj.org/article/a099c7635758466585bce37be0f0d791 |
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_ |
1766001392626958336 |