A Polarimetric Coherence Method to Determine Ice Crystal Orientation Fabric From Radar Sounding:Application to the NEEM Ice Core Region
Ice crystal orientation fabric (COF) records information about past ice-sheet deformation and influences the present-day flow of ice. Polarimetric radar sounding provides a means to infer anisotropic COF patterns due to the associated birefringence of polar ice. Here, we develop a polarimetric coher...
Published in: | IEEE Transactions on Geoscience and Remote Sensing |
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Format: | Article in Journal/Newspaper |
Language: | English |
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2019
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Online Access: | https://hdl.handle.net/1983/84c95c62-b98d-4586-abf0-1dfb8b8098be https://research-information.bris.ac.uk/en/publications/84c95c62-b98d-4586-abf0-1dfb8b8098be https://doi.org/10.1109/TGRS.2019.2921980 https://research-information.bris.ac.uk/ws/files/202425680/Jordan2019_PolarimetricCoherence_AcceptedVersion.pdf |
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ftubristolcris:oai:research-information.bris.ac.uk:publications/84c95c62-b98d-4586-abf0-1dfb8b8098be 2024-02-04T09:59:36+01:00 A Polarimetric Coherence Method to Determine Ice Crystal Orientation Fabric From Radar Sounding:Application to the NEEM Ice Core Region Jordan, Tom Schroeder, Dustin Castelletti, Davide Li, Jilu Dall, Jorgen 2019-07-04 application/pdf https://hdl.handle.net/1983/84c95c62-b98d-4586-abf0-1dfb8b8098be https://research-information.bris.ac.uk/en/publications/84c95c62-b98d-4586-abf0-1dfb8b8098be https://doi.org/10.1109/TGRS.2019.2921980 https://research-information.bris.ac.uk/ws/files/202425680/Jordan2019_PolarimetricCoherence_AcceptedVersion.pdf eng eng info:eu-repo/semantics/openAccess Jordan , T , Schroeder , D , Castelletti , D , Li , J & Dall , J 2019 , ' A Polarimetric Coherence Method to Determine Ice Crystal Orientation Fabric From Radar Sounding : Application to the NEEM Ice Core Region ' , IEEE Transactions on Geoscience and Remote Sensing . https://doi.org/10.1109/TGRS.2019.2921980 article 2019 ftubristolcris https://doi.org/10.1109/TGRS.2019.2921980 2024-01-11T23:41:46Z Ice crystal orientation fabric (COF) records information about past ice-sheet deformation and influences the present-day flow of ice. Polarimetric radar sounding provides a means to infer anisotropic COF patterns due to the associated birefringence of polar ice. Here, we develop a polarimetric coherence (phase-based) method to determine horizontal properties of the COF. The method utilizes the azimuth and depth dependence of the vertical gradient of the hhvv coherence phase to infer the dielectric principal axes and birefringence, which are then related to the second-order fabric orientation tensor. Specifically, under the assumption that one of the orientational eigenvectors is vertical, we can determine the horizontal eigenvectors and the difference between the horizontal eigenvalues (a measure of horizontal fabric asymmetry). The method exploits single-polarized data acquired with varying antenna orientation. It applies to ground-based ``multi-polarization'' surveys and is demonstrated using data acquired by Center for Remote Sensing of Ice Sheets (CReSIS) using Multi-Channel Coherent Radar Depth Sounder (MCRDS) from the North Greenland Eemian Ice Drilling (NEEM) ice core region in Greenland. The analysis is validated using a combination of polarimetric matrix backscatter simulations and comparison with COF data from the NEEM ice core. The results are consistent with a conventional model of ice deformation at an ice divide where a lateral tension component is present, with minor horizontal COF asymmetry and the greatest horizontal concentration of crystallographic axes orientated near parallel to the ice divide. Article in Journal/Newspaper Center for Remote Sensing of Ice Sheets (CReSIS) Greenland ice core Ice Sheet North Greenland University of Bristol: Bristol Research Greenland IEEE Transactions on Geoscience and Remote Sensing 57 11 8641 8657 |
institution |
Open Polar |
collection |
University of Bristol: Bristol Research |
op_collection_id |
ftubristolcris |
language |
English |
description |
Ice crystal orientation fabric (COF) records information about past ice-sheet deformation and influences the present-day flow of ice. Polarimetric radar sounding provides a means to infer anisotropic COF patterns due to the associated birefringence of polar ice. Here, we develop a polarimetric coherence (phase-based) method to determine horizontal properties of the COF. The method utilizes the azimuth and depth dependence of the vertical gradient of the hhvv coherence phase to infer the dielectric principal axes and birefringence, which are then related to the second-order fabric orientation tensor. Specifically, under the assumption that one of the orientational eigenvectors is vertical, we can determine the horizontal eigenvectors and the difference between the horizontal eigenvalues (a measure of horizontal fabric asymmetry). The method exploits single-polarized data acquired with varying antenna orientation. It applies to ground-based ``multi-polarization'' surveys and is demonstrated using data acquired by Center for Remote Sensing of Ice Sheets (CReSIS) using Multi-Channel Coherent Radar Depth Sounder (MCRDS) from the North Greenland Eemian Ice Drilling (NEEM) ice core region in Greenland. The analysis is validated using a combination of polarimetric matrix backscatter simulations and comparison with COF data from the NEEM ice core. The results are consistent with a conventional model of ice deformation at an ice divide where a lateral tension component is present, with minor horizontal COF asymmetry and the greatest horizontal concentration of crystallographic axes orientated near parallel to the ice divide. |
format |
Article in Journal/Newspaper |
author |
Jordan, Tom Schroeder, Dustin Castelletti, Davide Li, Jilu Dall, Jorgen |
spellingShingle |
Jordan, Tom Schroeder, Dustin Castelletti, Davide Li, Jilu Dall, Jorgen A Polarimetric Coherence Method to Determine Ice Crystal Orientation Fabric From Radar Sounding:Application to the NEEM Ice Core Region |
author_facet |
Jordan, Tom Schroeder, Dustin Castelletti, Davide Li, Jilu Dall, Jorgen |
author_sort |
Jordan, Tom |
title |
A Polarimetric Coherence Method to Determine Ice Crystal Orientation Fabric From Radar Sounding:Application to the NEEM Ice Core Region |
title_short |
A Polarimetric Coherence Method to Determine Ice Crystal Orientation Fabric From Radar Sounding:Application to the NEEM Ice Core Region |
title_full |
A Polarimetric Coherence Method to Determine Ice Crystal Orientation Fabric From Radar Sounding:Application to the NEEM Ice Core Region |
title_fullStr |
A Polarimetric Coherence Method to Determine Ice Crystal Orientation Fabric From Radar Sounding:Application to the NEEM Ice Core Region |
title_full_unstemmed |
A Polarimetric Coherence Method to Determine Ice Crystal Orientation Fabric From Radar Sounding:Application to the NEEM Ice Core Region |
title_sort |
polarimetric coherence method to determine ice crystal orientation fabric from radar sounding:application to the neem ice core region |
publishDate |
2019 |
url |
https://hdl.handle.net/1983/84c95c62-b98d-4586-abf0-1dfb8b8098be https://research-information.bris.ac.uk/en/publications/84c95c62-b98d-4586-abf0-1dfb8b8098be https://doi.org/10.1109/TGRS.2019.2921980 https://research-information.bris.ac.uk/ws/files/202425680/Jordan2019_PolarimetricCoherence_AcceptedVersion.pdf |
geographic |
Greenland |
geographic_facet |
Greenland |
genre |
Center for Remote Sensing of Ice Sheets (CReSIS) Greenland ice core Ice Sheet North Greenland |
genre_facet |
Center for Remote Sensing of Ice Sheets (CReSIS) Greenland ice core Ice Sheet North Greenland |
op_source |
Jordan , T , Schroeder , D , Castelletti , D , Li , J & Dall , J 2019 , ' A Polarimetric Coherence Method to Determine Ice Crystal Orientation Fabric From Radar Sounding : Application to the NEEM Ice Core Region ' , IEEE Transactions on Geoscience and Remote Sensing . https://doi.org/10.1109/TGRS.2019.2921980 |
op_rights |
info:eu-repo/semantics/openAccess |
op_doi |
https://doi.org/10.1109/TGRS.2019.2921980 |
container_title |
IEEE Transactions on Geoscience and Remote Sensing |
container_volume |
57 |
container_issue |
11 |
container_start_page |
8641 |
op_container_end_page |
8657 |
_version_ |
1789964505424330752 |