Progressive Degradation of an Ice Rumple in the Thwaites Ice Shelf, Antarctica, as Observed from High-Resolution Digital Elevation Models
Ice rumples are locally-grounded features of flowing ice shelves, elevated tens of meters above the surrounding surface. These features may significantly impact the dynamics of ice-shelf grounding lines, which are strongly related to shelf stability. In this study, we used TanDEM-X data to construct...
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ftmdpi:oai:mdpi.com:/2072-4292/10/8/1236/ 2023-08-20T04:00:58+02:00 Progressive Degradation of an Ice Rumple in the Thwaites Ice Shelf, Antarctica, as Observed from High-Resolution Digital Elevation Models Seung Hee Kim Duk-jin Kim Hyun-Cheol Kim agris 2018-08-06 application/pdf https://doi.org/10.3390/rs10081236 EN eng Multidisciplinary Digital Publishing Institute Remote Sensing in Geology, Geomorphology and Hydrology https://dx.doi.org/10.3390/rs10081236 https://creativecommons.org/licenses/by/4.0/ Remote Sensing; Volume 10; Issue 8; Pages: 1236 ice shelf digital elevation model ice rumple TanDEM-X viscoelastic deformation Antarctica Text 2018 ftmdpi https://doi.org/10.3390/rs10081236 2023-07-31T21:39:54Z Ice rumples are locally-grounded features of flowing ice shelves, elevated tens of meters above the surrounding surface. These features may significantly impact the dynamics of ice-shelf grounding lines, which are strongly related to shelf stability. In this study, we used TanDEM-X data to construct high-resolution DEMs of the Thwaites ice shelf in West Antarctica from 2011 to 2013. We also generated surface deformation maps which allowed us to detect and monitor the elevation changes of an ice rumple that appeared sometime between the observations of a grounding line of the Thwaites glacier using Double-Differential Interferometric SAR (DDInSAR) in 1996 and 2011. The observed degradation of the ice rumple during 2011–2013 may be related to a loss of contact with the underlying bathymetry caused by the thinning of the ice shelf. We subsequently used a viscoelastic deformation model with a finite spherical pressure source to reproduce the surface expression of the ice rumple. Global optimization allowed us to fit the model to the observed deformation map, producing reasonable estimates of the ice thickness at the center of the pressure source. Our conclusion is that combining the use of multiple high-resolution DEMs and the simple viscoelastic deformation model is feasible for observing and understanding the transient nature of small ice rumples, with implications for monitoring ice shelf stability. Text Antarc* Antarctica Ice Shelf Ice Shelves Thwaites Glacier Thwaites Ice Shelf West Antarctica MDPI Open Access Publishing West Antarctica Thwaites Glacier ENVELOPE(-106.750,-106.750,-75.500,-75.500) Remote Sensing 10 8 1236 |
institution |
Open Polar |
collection |
MDPI Open Access Publishing |
op_collection_id |
ftmdpi |
language |
English |
topic |
ice shelf digital elevation model ice rumple TanDEM-X viscoelastic deformation Antarctica |
spellingShingle |
ice shelf digital elevation model ice rumple TanDEM-X viscoelastic deformation Antarctica Seung Hee Kim Duk-jin Kim Hyun-Cheol Kim Progressive Degradation of an Ice Rumple in the Thwaites Ice Shelf, Antarctica, as Observed from High-Resolution Digital Elevation Models |
topic_facet |
ice shelf digital elevation model ice rumple TanDEM-X viscoelastic deformation Antarctica |
description |
Ice rumples are locally-grounded features of flowing ice shelves, elevated tens of meters above the surrounding surface. These features may significantly impact the dynamics of ice-shelf grounding lines, which are strongly related to shelf stability. In this study, we used TanDEM-X data to construct high-resolution DEMs of the Thwaites ice shelf in West Antarctica from 2011 to 2013. We also generated surface deformation maps which allowed us to detect and monitor the elevation changes of an ice rumple that appeared sometime between the observations of a grounding line of the Thwaites glacier using Double-Differential Interferometric SAR (DDInSAR) in 1996 and 2011. The observed degradation of the ice rumple during 2011–2013 may be related to a loss of contact with the underlying bathymetry caused by the thinning of the ice shelf. We subsequently used a viscoelastic deformation model with a finite spherical pressure source to reproduce the surface expression of the ice rumple. Global optimization allowed us to fit the model to the observed deformation map, producing reasonable estimates of the ice thickness at the center of the pressure source. Our conclusion is that combining the use of multiple high-resolution DEMs and the simple viscoelastic deformation model is feasible for observing and understanding the transient nature of small ice rumples, with implications for monitoring ice shelf stability. |
format |
Text |
author |
Seung Hee Kim Duk-jin Kim Hyun-Cheol Kim |
author_facet |
Seung Hee Kim Duk-jin Kim Hyun-Cheol Kim |
author_sort |
Seung Hee Kim |
title |
Progressive Degradation of an Ice Rumple in the Thwaites Ice Shelf, Antarctica, as Observed from High-Resolution Digital Elevation Models |
title_short |
Progressive Degradation of an Ice Rumple in the Thwaites Ice Shelf, Antarctica, as Observed from High-Resolution Digital Elevation Models |
title_full |
Progressive Degradation of an Ice Rumple in the Thwaites Ice Shelf, Antarctica, as Observed from High-Resolution Digital Elevation Models |
title_fullStr |
Progressive Degradation of an Ice Rumple in the Thwaites Ice Shelf, Antarctica, as Observed from High-Resolution Digital Elevation Models |
title_full_unstemmed |
Progressive Degradation of an Ice Rumple in the Thwaites Ice Shelf, Antarctica, as Observed from High-Resolution Digital Elevation Models |
title_sort |
progressive degradation of an ice rumple in the thwaites ice shelf, antarctica, as observed from high-resolution digital elevation models |
publisher |
Multidisciplinary Digital Publishing Institute |
publishDate |
2018 |
url |
https://doi.org/10.3390/rs10081236 |
op_coverage |
agris |
long_lat |
ENVELOPE(-106.750,-106.750,-75.500,-75.500) |
geographic |
West Antarctica Thwaites Glacier |
geographic_facet |
West Antarctica Thwaites Glacier |
genre |
Antarc* Antarctica Ice Shelf Ice Shelves Thwaites Glacier Thwaites Ice Shelf West Antarctica |
genre_facet |
Antarc* Antarctica Ice Shelf Ice Shelves Thwaites Glacier Thwaites Ice Shelf West Antarctica |
op_source |
Remote Sensing; Volume 10; Issue 8; Pages: 1236 |
op_relation |
Remote Sensing in Geology, Geomorphology and Hydrology https://dx.doi.org/10.3390/rs10081236 |
op_rights |
https://creativecommons.org/licenses/by/4.0/ |
op_doi |
https://doi.org/10.3390/rs10081236 |
container_title |
Remote Sensing |
container_volume |
10 |
container_issue |
8 |
container_start_page |
1236 |
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1774721706489806848 |