High-resolution distributed vertical strain and velocity from repeat borehole logging by optical televiewer: Derwael Ice Rise, Antarctica
Abstract 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...
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ftunivbruxelles:oai:dipot.ulb.ac.be:2013/304871 2024-04-28T07:56:12+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 2020-04-01 1 full-text file(s): application/pdf http://hdl.handle.net/2013/ULB-DIPOT:oai:dipot.ulb.ac.be:2013/304871 https://dipot.ulb.ac.be/dspace/bitstream/2013/304871/1/doi_288515.pdf en eng uri/info:doi/10.1017/jog.2020.18 uri/info:pii/S0022143020000180 uri/info:scp/85083333844 https://dipot.ulb.ac.be/dspace/bitstream/2013/304871/1/doi_288515.pdf http://hdl.handle.net/2013/ULB-DIPOT:oai:dipot.ulb.ac.be:2013/304871 1 full-text file(s): info:eu-repo/semantics/openAccess Journal of Glaciology Sciences exactes et naturelles Accumulation ice shelves ice thickness measurements mass-balance reconstruction polar firn info:eu-repo/semantics/article info:ulb-repo/semantics/articlePeerReview info:ulb-repo/semantics/openurl/article 2020 ftunivbruxelles 2024-04-10T00:10:31Z Abstract 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. SCOPUS: ar.j info:eu-repo/semantics/published Article in Journal/Newspaper Antarc* Antarctica Ice Shelves Journal of Glaciology DI-fusion : dépôt institutionnel de l'Université libre de Bruxelles (ULB) |
institution |
Open Polar |
collection |
DI-fusion : dépôt institutionnel de l'Université libre de Bruxelles (ULB) |
op_collection_id |
ftunivbruxelles |
language |
English |
topic |
Sciences exactes et naturelles Accumulation ice shelves ice thickness measurements mass-balance reconstruction polar firn |
spellingShingle |
Sciences exactes et naturelles 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 |
Sciences exactes et naturelles Accumulation ice shelves ice thickness measurements mass-balance reconstruction polar firn |
description |
Abstract 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. SCOPUS: ar.j info:eu-repo/semantics/published |
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 |
http://hdl.handle.net/2013/ULB-DIPOT:oai:dipot.ulb.ac.be:2013/304871 https://dipot.ulb.ac.be/dspace/bitstream/2013/304871/1/doi_288515.pdf |
genre |
Antarc* Antarctica Ice Shelves Journal of Glaciology |
genre_facet |
Antarc* Antarctica Ice Shelves Journal of Glaciology |
op_source |
Journal of Glaciology |
op_relation |
uri/info:doi/10.1017/jog.2020.18 uri/info:pii/S0022143020000180 uri/info:scp/85083333844 https://dipot.ulb.ac.be/dspace/bitstream/2013/304871/1/doi_288515.pdf http://hdl.handle.net/2013/ULB-DIPOT:oai:dipot.ulb.ac.be:2013/304871 |
op_rights |
1 full-text file(s): info:eu-repo/semantics/openAccess |
_version_ |
1797582413188038656 |