Quantifying bed roughness beneath contemporary and palaeo-ice streams
Bed roughness is an important control on ice-stream location and dynamics. The majority of previous bed roughness studies have been based on data derived from radio-echo sounding (RES) transects across Antarctica and Greenland. However, the wide spacing of RES transects means that the links between...
Published in: | Journal of Glaciology |
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Cambridge University Press
2018
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Online Access: | https://eprints.whiterose.ac.uk/137325/ https://eprints.whiterose.ac.uk/137325/1/quantifying_bed_roughness_beneath_contemporary_and_palaeoice_streams.pdf https://www.cambridge.org/core/journals/journal-of-glaciology/article/quantifying-bed-roughness-beneath-contemporary-and-palaeoice-streams/7B74B2FEB0FC32C60D252AAA972F436F https://doi.org/10.1017/jog.2018.71 |
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ftleedsuniv:oai:eprints.whiterose.ac.uk:137325 2023-05-15T13:57:46+02:00 Quantifying bed roughness beneath contemporary and palaeo-ice streams Falcini, Francesca Rippin, David Krabbendam, Maarten Selby, Katherine 2018-09-13 text https://eprints.whiterose.ac.uk/137325/ https://eprints.whiterose.ac.uk/137325/1/quantifying_bed_roughness_beneath_contemporary_and_palaeoice_streams.pdf https://www.cambridge.org/core/journals/journal-of-glaciology/article/quantifying-bed-roughness-beneath-contemporary-and-palaeoice-streams/7B74B2FEB0FC32C60D252AAA972F436F https://doi.org/10.1017/jog.2018.71 en eng Cambridge University Press https://eprints.whiterose.ac.uk/137325/1/quantifying_bed_roughness_beneath_contemporary_and_palaeoice_streams.pdf Falcini, Francesca orcid.org/0000-0001-8619-2637 , Rippin, David, Krabbendam, Maarten et al. (1 more author) (2018) Quantifying bed roughness beneath contemporary and palaeo-ice streams. Journal of Glaciology. cc_by_4 CC-BY Article PeerReviewed 2018 ftleedsuniv https://doi.org/10.1017/jog.2018.71 2023-01-30T22:11:46Z Bed roughness is an important control on ice-stream location and dynamics. The majority of previous bed roughness studies have been based on data derived from radio-echo sounding (RES) transects across Antarctica and Greenland. However, the wide spacing of RES transects means that the links between roughness and flow are poorly constrained. Here, we use Digital Terrain Model/bathymetry data from a well-preserved palaeo-ice stream to investigate basal controls on the behaviour of contemporary ice streams. Artificial transects were set up across the Minch Palaeo-Ice Stream (NW Scotland) to mimic RES flight lines over Institute and Möller Ice Streams (Antarctica). We then explored how different data-resolution, transect orientation and spacing, and different methods, impact roughness measurements. Our results show that fast palaeo-ice flow can occur over a rough, hard bed, not just a smooth, soft bed, as previous work has suggested. Smooth areas of the bed occur over both bedrock and sediment covered regions. Similar trends in bed roughness values were found using Fast Fourier Transform analysis and standard deviation methods. Smoothing of bed roughness results can hide important details. We propose that the typical spacing of RES transects is too wide to capture different landform assemblages and that transect orientation influences bed roughness measurements in both contemporary and palaeo-ice-stream setting. Article in Journal/Newspaper Antarc* Antarctica Greenland Journal of Glaciology White Rose Research Online (Universities of Leeds, Sheffield & York) Greenland Journal of Glaciology 64 247 822 834 |
institution |
Open Polar |
collection |
White Rose Research Online (Universities of Leeds, Sheffield & York) |
op_collection_id |
ftleedsuniv |
language |
English |
description |
Bed roughness is an important control on ice-stream location and dynamics. The majority of previous bed roughness studies have been based on data derived from radio-echo sounding (RES) transects across Antarctica and Greenland. However, the wide spacing of RES transects means that the links between roughness and flow are poorly constrained. Here, we use Digital Terrain Model/bathymetry data from a well-preserved palaeo-ice stream to investigate basal controls on the behaviour of contemporary ice streams. Artificial transects were set up across the Minch Palaeo-Ice Stream (NW Scotland) to mimic RES flight lines over Institute and Möller Ice Streams (Antarctica). We then explored how different data-resolution, transect orientation and spacing, and different methods, impact roughness measurements. Our results show that fast palaeo-ice flow can occur over a rough, hard bed, not just a smooth, soft bed, as previous work has suggested. Smooth areas of the bed occur over both bedrock and sediment covered regions. Similar trends in bed roughness values were found using Fast Fourier Transform analysis and standard deviation methods. Smoothing of bed roughness results can hide important details. We propose that the typical spacing of RES transects is too wide to capture different landform assemblages and that transect orientation influences bed roughness measurements in both contemporary and palaeo-ice-stream setting. |
format |
Article in Journal/Newspaper |
author |
Falcini, Francesca Rippin, David Krabbendam, Maarten Selby, Katherine |
spellingShingle |
Falcini, Francesca Rippin, David Krabbendam, Maarten Selby, Katherine Quantifying bed roughness beneath contemporary and palaeo-ice streams |
author_facet |
Falcini, Francesca Rippin, David Krabbendam, Maarten Selby, Katherine |
author_sort |
Falcini, Francesca |
title |
Quantifying bed roughness beneath contemporary and palaeo-ice streams |
title_short |
Quantifying bed roughness beneath contemporary and palaeo-ice streams |
title_full |
Quantifying bed roughness beneath contemporary and palaeo-ice streams |
title_fullStr |
Quantifying bed roughness beneath contemporary and palaeo-ice streams |
title_full_unstemmed |
Quantifying bed roughness beneath contemporary and palaeo-ice streams |
title_sort |
quantifying bed roughness beneath contemporary and palaeo-ice streams |
publisher |
Cambridge University Press |
publishDate |
2018 |
url |
https://eprints.whiterose.ac.uk/137325/ https://eprints.whiterose.ac.uk/137325/1/quantifying_bed_roughness_beneath_contemporary_and_palaeoice_streams.pdf https://www.cambridge.org/core/journals/journal-of-glaciology/article/quantifying-bed-roughness-beneath-contemporary-and-palaeoice-streams/7B74B2FEB0FC32C60D252AAA972F436F https://doi.org/10.1017/jog.2018.71 |
geographic |
Greenland |
geographic_facet |
Greenland |
genre |
Antarc* Antarctica Greenland Journal of Glaciology |
genre_facet |
Antarc* Antarctica Greenland Journal of Glaciology |
op_relation |
https://eprints.whiterose.ac.uk/137325/1/quantifying_bed_roughness_beneath_contemporary_and_palaeoice_streams.pdf Falcini, Francesca orcid.org/0000-0001-8619-2637 , Rippin, David, Krabbendam, Maarten et al. (1 more author) (2018) Quantifying bed roughness beneath contemporary and palaeo-ice streams. Journal of Glaciology. |
op_rights |
cc_by_4 |
op_rightsnorm |
CC-BY |
op_doi |
https://doi.org/10.1017/jog.2018.71 |
container_title |
Journal of Glaciology |
container_volume |
64 |
container_issue |
247 |
container_start_page |
822 |
op_container_end_page |
834 |
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1766265663881478144 |