Characterizing bed roughness on the Antarctic continental margin
Abstract Spatial variability in bed topography, characterized as bed roughness, impacts ice-sheet flow and organization and can be used to infer subglacial conditions and processes, yet is difficult to quantify due to sparse observations. Paleo-subglacial beds of formerly expanded glaciers found acr...
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Online Access: | http://dx.doi.org/10.1017/jog.2023.88 https://www.cambridge.org/core/services/aop-cambridge-core/content/view/S0022143023000886 |
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crcambridgeupr:10.1017/jog.2023.88 2024-03-03T08:36:38+00:00 Characterizing bed roughness on the Antarctic continental margin Munevar Garcia, Santiago Miller, Lauren Elizabeth Falcini, Francesca Anna Maria Stearns, Leigh Asher Division of Antarctic Sciences 2023 http://dx.doi.org/10.1017/jog.2023.88 https://www.cambridge.org/core/services/aop-cambridge-core/content/view/S0022143023000886 en eng Cambridge University Press (CUP) http://creativecommons.org/licenses/by/4.0/ Journal of Glaciology page 1-12 ISSN 0022-1430 1727-5652 Earth-Surface Processes journal-article 2023 crcambridgeupr https://doi.org/10.1017/jog.2023.88 2024-02-08T08:43:04Z Abstract Spatial variability in bed topography, characterized as bed roughness, impacts ice-sheet flow and organization and can be used to infer subglacial conditions and processes, yet is difficult to quantify due to sparse observations. Paleo-subglacial beds of formerly expanded glaciers found across the Antarctic continental shelf are well preserved, have relatively limited post-glacial sediment cover and contain glacial landforms that can be resolved at sub-meter vertical scales. We analyze high-resolution bathymetry offshore of Pine Island and Thwaites glaciers in the Amundsen Sea to explore spatial variability of bed roughness where streamlined subglacial landforms allow for the determination of ice-flow direction. We quantify bed roughness using std dev. and Fast Fourier Transform methods, each employed at local (10 0 km) and regional (10 1–2 km) scales and in along- and across-flow orientations to determine roughness expressions across spatial scales. We find that the magnitude of roughness is impacted by the parameters selected – which are often not sufficiently reported in studies – to quantify roughness. Important spatial patterns can be discerned from high-resolution bathymetry, highlighting both its usefulness in identifying patterns of streaming ice flow and underscores the need for a standardized way of characterizing topographic variability. Article in Journal/Newspaper Amundsen Sea Antarc* Antarctic Ice Sheet Journal of Glaciology Cambridge University Press Antarctic The Antarctic Amundsen Sea Journal of Glaciology 1 12 |
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Cambridge University Press |
op_collection_id |
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English |
topic |
Earth-Surface Processes |
spellingShingle |
Earth-Surface Processes Munevar Garcia, Santiago Miller, Lauren Elizabeth Falcini, Francesca Anna Maria Stearns, Leigh Asher Characterizing bed roughness on the Antarctic continental margin |
topic_facet |
Earth-Surface Processes |
description |
Abstract Spatial variability in bed topography, characterized as bed roughness, impacts ice-sheet flow and organization and can be used to infer subglacial conditions and processes, yet is difficult to quantify due to sparse observations. Paleo-subglacial beds of formerly expanded glaciers found across the Antarctic continental shelf are well preserved, have relatively limited post-glacial sediment cover and contain glacial landforms that can be resolved at sub-meter vertical scales. We analyze high-resolution bathymetry offshore of Pine Island and Thwaites glaciers in the Amundsen Sea to explore spatial variability of bed roughness where streamlined subglacial landforms allow for the determination of ice-flow direction. We quantify bed roughness using std dev. and Fast Fourier Transform methods, each employed at local (10 0 km) and regional (10 1–2 km) scales and in along- and across-flow orientations to determine roughness expressions across spatial scales. We find that the magnitude of roughness is impacted by the parameters selected – which are often not sufficiently reported in studies – to quantify roughness. Important spatial patterns can be discerned from high-resolution bathymetry, highlighting both its usefulness in identifying patterns of streaming ice flow and underscores the need for a standardized way of characterizing topographic variability. |
author2 |
Division of Antarctic Sciences |
format |
Article in Journal/Newspaper |
author |
Munevar Garcia, Santiago Miller, Lauren Elizabeth Falcini, Francesca Anna Maria Stearns, Leigh Asher |
author_facet |
Munevar Garcia, Santiago Miller, Lauren Elizabeth Falcini, Francesca Anna Maria Stearns, Leigh Asher |
author_sort |
Munevar Garcia, Santiago |
title |
Characterizing bed roughness on the Antarctic continental margin |
title_short |
Characterizing bed roughness on the Antarctic continental margin |
title_full |
Characterizing bed roughness on the Antarctic continental margin |
title_fullStr |
Characterizing bed roughness on the Antarctic continental margin |
title_full_unstemmed |
Characterizing bed roughness on the Antarctic continental margin |
title_sort |
characterizing bed roughness on the antarctic continental margin |
publisher |
Cambridge University Press (CUP) |
publishDate |
2023 |
url |
http://dx.doi.org/10.1017/jog.2023.88 https://www.cambridge.org/core/services/aop-cambridge-core/content/view/S0022143023000886 |
geographic |
Antarctic The Antarctic Amundsen Sea |
geographic_facet |
Antarctic The Antarctic Amundsen Sea |
genre |
Amundsen Sea Antarc* Antarctic Ice Sheet Journal of Glaciology |
genre_facet |
Amundsen Sea Antarc* Antarctic Ice Sheet Journal of Glaciology |
op_source |
Journal of Glaciology page 1-12 ISSN 0022-1430 1727-5652 |
op_rights |
http://creativecommons.org/licenses/by/4.0/ |
op_doi |
https://doi.org/10.1017/jog.2023.88 |
container_title |
Journal of Glaciology |
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1 |
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12 |
_version_ |
1792494487846518784 |