High-resolution distributed vertical strain and velocity from repeat borehole logging by optical televiewer:Derwael Ice Rise, Antarctica
Direct measurements of spatially distributed vertical strain within ice masses are scientifically valuable but challenging to acquire. We use manual marker tracking and automatic cross correlation between two repeat optical televiewer (OPTV) images of an ~100 m-long borehole at Derwael Ice Rise (DIR...
Published in: | Journal of Glaciology |
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Format: | Article in Journal/Newspaper |
Language: | English |
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2020
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Online Access: | https://research-portal.st-andrews.ac.uk/en/researchoutput/highresolution-distributed-vertical-strain-and-velocity-from-repeat-borehole-logging-by-optical-televiewer(6f080aff-6b42-49b5-ae5e-f4db4fbf2cdf).html https://doi.org/10.1017/jog.2020.18 http://www.scopus.com/inward/record.url?scp=85083333844&partnerID=8YFLogxK |
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ftunstandrewcris:oai:research-portal.st-andrews.ac.uk:publications/6f080aff-6b42-49b5-ae5e-f4db4fbf2cdf 2024-06-23T07:47:58+00:00 High-resolution distributed vertical strain and velocity from repeat borehole logging by optical televiewer:Derwael Ice Rise, Antarctica Hubbard, Bryn Philippe, Morgane Pattyn, Frank Drews, Reinhard Young, Tun Jan Bruyninx, Carine Bergeot, Nicolas Fjosne, Karen Tison, Jean Louis 2020-04-03 https://research-portal.st-andrews.ac.uk/en/researchoutput/highresolution-distributed-vertical-strain-and-velocity-from-repeat-borehole-logging-by-optical-televiewer(6f080aff-6b42-49b5-ae5e-f4db4fbf2cdf).html https://doi.org/10.1017/jog.2020.18 http://www.scopus.com/inward/record.url?scp=85083333844&partnerID=8YFLogxK eng eng https://research-portal.st-andrews.ac.uk/en/researchoutput/highresolution-distributed-vertical-strain-and-velocity-from-repeat-borehole-logging-by-optical-televiewer(6f080aff-6b42-49b5-ae5e-f4db4fbf2cdf).html info:eu-repo/semantics/openAccess Hubbard , B , Philippe , M , Pattyn , F , Drews , R , Young , T J , Bruyninx , C , Bergeot , N , Fjosne , K & Tison , J L 2020 , ' High-resolution distributed vertical strain and velocity from repeat borehole logging by optical televiewer : Derwael Ice Rise, Antarctica ' , Journal of Glaciology , vol. 66 , no. 258 , pp. 523-529 . https://doi.org/10.1017/jog.2020.18 Accumulation ice shelves ice thickness measurements mass-balance reconstruction polar firn article 2020 ftunstandrewcris https://doi.org/10.1017/jog.2020.18 2024-06-13T01:23:47Z Direct measurements of spatially distributed vertical strain within ice masses are scientifically valuable but challenging to acquire. We use manual marker tracking and automatic cross correlation between two repeat optical televiewer (OPTV) images of an ~100 m-long borehole at Derwael Ice Rise (DIR), Antarctica, to reconstruct discretised, vertical strain rate and velocity at millimetre resolution. The resulting profiles decay with depth, from -0.07 a-1 at the surface to ~-0.002 a-1 towards the base in strain and from -1.3 m a-1 at the surface to ~-0.5 m a-1 towards the base in velocity. Both profiles also show substantial local variability. Three coffee-can markers installed at different depths into adjacent boreholes record consistent strain rates and velocities, although averaged over longer depth ranges and subject to greater uncertainty. Measured strain-rate profiles generally compare closely with output from a 2-D ice-flow model, while the former additionally reveal substantial high-resolution variability. We conclude that repeat OPTV borehole logging represents an effective means of measuring distributed vertical strain at millimetre scale, revealing high-resolution variability along the uppermost ~100 m of DIR, Antarctica. Article in Journal/Newspaper Antarc* Antarctica Antarctica Journal Ice Shelves Journal of Glaciology University of St Andrews: Research Portal Journal of Glaciology 66 258 523 529 |
institution |
Open Polar |
collection |
University of St Andrews: Research Portal |
op_collection_id |
ftunstandrewcris |
language |
English |
topic |
Accumulation ice shelves ice thickness measurements mass-balance reconstruction polar firn |
spellingShingle |
Accumulation ice shelves ice thickness measurements mass-balance reconstruction polar firn Hubbard, Bryn Philippe, Morgane Pattyn, Frank Drews, Reinhard Young, Tun Jan Bruyninx, Carine Bergeot, Nicolas Fjosne, Karen Tison, Jean Louis High-resolution distributed vertical strain and velocity from repeat borehole logging by optical televiewer:Derwael Ice Rise, Antarctica |
topic_facet |
Accumulation ice shelves ice thickness measurements mass-balance reconstruction polar firn |
description |
Direct measurements of spatially distributed vertical strain within ice masses are scientifically valuable but challenging to acquire. We use manual marker tracking and automatic cross correlation between two repeat optical televiewer (OPTV) images of an ~100 m-long borehole at Derwael Ice Rise (DIR), Antarctica, to reconstruct discretised, vertical strain rate and velocity at millimetre resolution. The resulting profiles decay with depth, from -0.07 a-1 at the surface to ~-0.002 a-1 towards the base in strain and from -1.3 m a-1 at the surface to ~-0.5 m a-1 towards the base in velocity. Both profiles also show substantial local variability. Three coffee-can markers installed at different depths into adjacent boreholes record consistent strain rates and velocities, although averaged over longer depth ranges and subject to greater uncertainty. Measured strain-rate profiles generally compare closely with output from a 2-D ice-flow model, while the former additionally reveal substantial high-resolution variability. We conclude that repeat OPTV borehole logging represents an effective means of measuring distributed vertical strain at millimetre scale, revealing high-resolution variability along the uppermost ~100 m of DIR, Antarctica. |
format |
Article in Journal/Newspaper |
author |
Hubbard, Bryn Philippe, Morgane Pattyn, Frank Drews, Reinhard Young, Tun Jan Bruyninx, Carine Bergeot, Nicolas Fjosne, Karen Tison, Jean Louis |
author_facet |
Hubbard, Bryn Philippe, Morgane Pattyn, Frank Drews, Reinhard Young, Tun Jan Bruyninx, Carine Bergeot, Nicolas Fjosne, Karen Tison, Jean Louis |
author_sort |
Hubbard, Bryn |
title |
High-resolution distributed vertical strain and velocity from repeat borehole logging by optical televiewer:Derwael Ice Rise, Antarctica |
title_short |
High-resolution distributed vertical strain and velocity from repeat borehole logging by optical televiewer:Derwael Ice Rise, Antarctica |
title_full |
High-resolution distributed vertical strain and velocity from repeat borehole logging by optical televiewer:Derwael Ice Rise, Antarctica |
title_fullStr |
High-resolution distributed vertical strain and velocity from repeat borehole logging by optical televiewer:Derwael Ice Rise, Antarctica |
title_full_unstemmed |
High-resolution distributed vertical strain and velocity from repeat borehole logging by optical televiewer:Derwael Ice Rise, Antarctica |
title_sort |
high-resolution distributed vertical strain and velocity from repeat borehole logging by optical televiewer:derwael ice rise, antarctica |
publishDate |
2020 |
url |
https://research-portal.st-andrews.ac.uk/en/researchoutput/highresolution-distributed-vertical-strain-and-velocity-from-repeat-borehole-logging-by-optical-televiewer(6f080aff-6b42-49b5-ae5e-f4db4fbf2cdf).html https://doi.org/10.1017/jog.2020.18 http://www.scopus.com/inward/record.url?scp=85083333844&partnerID=8YFLogxK |
genre |
Antarc* Antarctica Antarctica Journal Ice Shelves Journal of Glaciology |
genre_facet |
Antarc* Antarctica Antarctica Journal Ice Shelves Journal of Glaciology |
op_source |
Hubbard , B , Philippe , M , Pattyn , F , Drews , R , Young , T J , Bruyninx , C , Bergeot , N , Fjosne , K & Tison , J L 2020 , ' High-resolution distributed vertical strain and velocity from repeat borehole logging by optical televiewer : Derwael Ice Rise, Antarctica ' , Journal of Glaciology , vol. 66 , no. 258 , pp. 523-529 . https://doi.org/10.1017/jog.2020.18 |
op_relation |
https://research-portal.st-andrews.ac.uk/en/researchoutput/highresolution-distributed-vertical-strain-and-velocity-from-repeat-borehole-logging-by-optical-televiewer(6f080aff-6b42-49b5-ae5e-f4db4fbf2cdf).html |
op_rights |
info:eu-repo/semantics/openAccess |
op_doi |
https://doi.org/10.1017/jog.2020.18 |
container_title |
Journal of Glaciology |
container_volume |
66 |
container_issue |
258 |
container_start_page |
523 |
op_container_end_page |
529 |
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1802638293047705600 |