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...
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ftleedsuniv:oai:eprints.whiterose.ac.uk:134107 2023-05-15T13:52:38+02:00 Quantifying bed roughness beneath contemporary and palaeo-ice streams Falcini, Francesca Anna Maria Rippin, David Manish Krabbendam, Maarten Selby, Katherine Anne 2018-09-13 text https://eprints.whiterose.ac.uk/134107/ https://eprints.whiterose.ac.uk/134107/1/JOG_18_0024_withfigs.pdf en eng https://eprints.whiterose.ac.uk/134107/1/JOG_18_0024_withfigs.pdf Falcini, Francesca Anna Maria, Rippin, David Manish orcid.org/0000-0001-7757-9880 , Krabbendam, Maarten et al. (1 more author) (2018) Quantifying bed roughness beneath contemporary and palaeo-ice streams. Journal of Glaciology. ISSN 0022-1430 Article PeerReviewed 2018 ftleedsuniv 2023-01-30T22:09:18Z 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 (DTM)/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 upon roughness measurements. Our results show that fast palaeo-ice flow can occur over a rough, hard bed, not just a smooth, soft bed, which much 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 |
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Open Polar |
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White Rose Research Online (Universities of Leeds, Sheffield & York) |
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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 (DTM)/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 upon roughness measurements. Our results show that fast palaeo-ice flow can occur over a rough, hard bed, not just a smooth, soft bed, which much 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 Anna Maria Rippin, David Manish Krabbendam, Maarten Selby, Katherine Anne |
spellingShingle |
Falcini, Francesca Anna Maria Rippin, David Manish Krabbendam, Maarten Selby, Katherine Anne Quantifying bed roughness beneath contemporary and palaeo-ice streams |
author_facet |
Falcini, Francesca Anna Maria Rippin, David Manish Krabbendam, Maarten Selby, Katherine Anne |
author_sort |
Falcini, Francesca Anna Maria |
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 |
publishDate |
2018 |
url |
https://eprints.whiterose.ac.uk/134107/ https://eprints.whiterose.ac.uk/134107/1/JOG_18_0024_withfigs.pdf |
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/134107/1/JOG_18_0024_withfigs.pdf Falcini, Francesca Anna Maria, Rippin, David Manish orcid.org/0000-0001-7757-9880 , Krabbendam, Maarten et al. (1 more author) (2018) Quantifying bed roughness beneath contemporary and palaeo-ice streams. Journal of Glaciology. ISSN 0022-1430 |
_version_ |
1766257060839686144 |