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...
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2020
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ftdoajarticles:oai:doaj.org/article:8a4485fcac1948a9ac58f888bf97bc46 2023-05-15T13:57:20+02:00 High-resolution distributed vertical strain and velocity from repeat borehole logging by optical televiewer: Derwael Ice Rise, Antarctica Bryn Hubbard Morgane Philippe Frank Pattyn Reinhard Drews Tun Jan Young Carine Bruyninx Nicolas Bergeot Karen Fjøsne Jean-Louis Tison 2020-08-01T00:00:00Z https://doi.org/10.1017/jog.2020.18 https://doaj.org/article/8a4485fcac1948a9ac58f888bf97bc46 EN eng Cambridge University Press https://www.cambridge.org/core/product/identifier/S0022143020000180/type/journal_article https://doaj.org/toc/0022-1430 https://doaj.org/toc/1727-5652 doi:10.1017/jog.2020.18 0022-1430 1727-5652 https://doaj.org/article/8a4485fcac1948a9ac58f888bf97bc46 Journal of Glaciology, Vol 66, Pp 523-529 (2020) Accumulation ice shelves ice thickness measurements mass-balance reconstruction polar firn Environmental sciences GE1-350 Meteorology. Climatology QC851-999 article 2020 ftdoajarticles https://doi.org/10.1017/jog.2020.18 2023-03-12T01:30:57Z 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 Ice Shelves Journal of Glaciology Directory of Open Access Journals: DOAJ Articles Journal of Glaciology 66 258 523 529 |
institution |
Open Polar |
collection |
Directory of Open Access Journals: DOAJ Articles |
op_collection_id |
ftdoajarticles |
language |
English |
topic |
Accumulation ice shelves ice thickness measurements mass-balance reconstruction polar firn Environmental sciences GE1-350 Meteorology. Climatology QC851-999 |
spellingShingle |
Accumulation ice shelves ice thickness measurements mass-balance reconstruction polar firn Environmental sciences GE1-350 Meteorology. Climatology QC851-999 Bryn Hubbard Morgane Philippe Frank Pattyn Reinhard Drews Tun Jan Young Carine Bruyninx Nicolas Bergeot Karen Fjøsne Jean-Louis Tison 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 Environmental sciences GE1-350 Meteorology. Climatology QC851-999 |
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 |
Bryn Hubbard Morgane Philippe Frank Pattyn Reinhard Drews Tun Jan Young Carine Bruyninx Nicolas Bergeot Karen Fjøsne Jean-Louis Tison |
author_facet |
Bryn Hubbard Morgane Philippe Frank Pattyn Reinhard Drews Tun Jan Young Carine Bruyninx Nicolas Bergeot Karen Fjøsne Jean-Louis Tison |
author_sort |
Bryn Hubbard |
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 |
publisher |
Cambridge University Press |
publishDate |
2020 |
url |
https://doi.org/10.1017/jog.2020.18 https://doaj.org/article/8a4485fcac1948a9ac58f888bf97bc46 |
genre |
Antarc* Antarctica Ice Shelves Journal of Glaciology |
genre_facet |
Antarc* Antarctica Ice Shelves Journal of Glaciology |
op_source |
Journal of Glaciology, Vol 66, Pp 523-529 (2020) |
op_relation |
https://www.cambridge.org/core/product/identifier/S0022143020000180/type/journal_article https://doaj.org/toc/0022-1430 https://doaj.org/toc/1727-5652 doi:10.1017/jog.2020.18 0022-1430 1727-5652 https://doaj.org/article/8a4485fcac1948a9ac58f888bf97bc46 |
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 |
_version_ |
1766264956787884032 |