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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Cambridge University Press
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ftdoajarticles:oai:doaj.org/article:52ed7837493a4a82947990f88a0f8b9e 2023-05-15T13:47:06+02:00 Quantifying bed roughness beneath contemporary and palaeo-ice streams FRANCESCA A.M. FALCINI DAVID M. RIPPIN MAARTEN KRABBENDAM KATHERINE A. SELBY 2018-10-01T00:00:00Z https://doi.org/10.1017/jog.2018.71 https://doaj.org/article/52ed7837493a4a82947990f88a0f8b9e EN eng Cambridge University Press https://www.cambridge.org/core/product/identifier/S0022143018000710/type/journal_article https://doaj.org/toc/0022-1430 https://doaj.org/toc/1727-5652 doi:10.1017/jog.2018.71 0022-1430 1727-5652 https://doaj.org/article/52ed7837493a4a82947990f88a0f8b9e Journal of Glaciology, Vol 64, Pp 822-834 (2018) geomorphology ice streams radio-echo sounding remote sensing Environmental sciences GE1-350 Meteorology. Climatology QC851-999 article 2018 ftdoajarticles https://doi.org/10.1017/jog.2018.71 2023-03-12T01:30:59Z 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 Directory of Open Access Journals: DOAJ Articles Greenland Journal of Glaciology 64 247 822 834 |
institution |
Open Polar |
collection |
Directory of Open Access Journals: DOAJ Articles |
op_collection_id |
ftdoajarticles |
language |
English |
topic |
geomorphology ice streams radio-echo sounding remote sensing Environmental sciences GE1-350 Meteorology. Climatology QC851-999 |
spellingShingle |
geomorphology ice streams radio-echo sounding remote sensing Environmental sciences GE1-350 Meteorology. Climatology QC851-999 FRANCESCA A.M. FALCINI DAVID M. RIPPIN MAARTEN KRABBENDAM KATHERINE A. SELBY Quantifying bed roughness beneath contemporary and palaeo-ice streams |
topic_facet |
geomorphology ice streams radio-echo sounding remote sensing Environmental sciences GE1-350 Meteorology. Climatology QC851-999 |
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 |
FRANCESCA A.M. FALCINI DAVID M. RIPPIN MAARTEN KRABBENDAM KATHERINE A. SELBY |
author_facet |
FRANCESCA A.M. FALCINI DAVID M. RIPPIN MAARTEN KRABBENDAM KATHERINE A. SELBY |
author_sort |
FRANCESCA A.M. FALCINI |
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://doi.org/10.1017/jog.2018.71 https://doaj.org/article/52ed7837493a4a82947990f88a0f8b9e |
geographic |
Greenland |
geographic_facet |
Greenland |
genre |
Antarc* Antarctica Greenland Journal of Glaciology |
genre_facet |
Antarc* Antarctica Greenland Journal of Glaciology |
op_source |
Journal of Glaciology, Vol 64, Pp 822-834 (2018) |
op_relation |
https://www.cambridge.org/core/product/identifier/S0022143018000710/type/journal_article https://doaj.org/toc/0022-1430 https://doaj.org/toc/1727-5652 doi:10.1017/jog.2018.71 0022-1430 1727-5652 https://doaj.org/article/52ed7837493a4a82947990f88a0f8b9e |
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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1766246315916787712 |