Hard Rock Landforms Generate 130 km Ice Shelf Channels through Water Focusing in Basal Corrugations
Satellite imagery reveals flowstripes on Foundation Ice Stream parallel to ice flow, and meandering features on the ice-shelf that cross-cut ice flow and are thought to be formed by water exiting a well-organised subglacial system. Here, ice-penetrating radar data show flow-parallel hard-bed landfor...
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ftunisfloridatam:oai:digitalcommons.usf.edu:msc_facpub-2535 2023-05-15T14:04:11+02:00 Hard Rock Landforms Generate 130 km Ice Shelf Channels through Water Focusing in Basal Corrugations Jeofry, Hafeez Ross, Neil Le Brocq, Anne Graham, Alastair G. C. Li, Jilu Gogineni, Prasad Morlighem, Mathieu Jordan, Thomas Siegert, Martin J. 2018-01-01T08:00:00Z application/pdf https://digitalcommons.usf.edu/msc_facpub/1525 https://digitalcommons.usf.edu/cgi/viewcontent.cgi?article=2535&context=msc_facpub unknown Digital Commons @ University of South Florida https://digitalcommons.usf.edu/msc_facpub/1525 https://digitalcommons.usf.edu/cgi/viewcontent.cgi?article=2535&context=msc_facpub http://creativecommons.org/licenses/by/4.0/ CC-BY Marine Science Faculty Publications Cryospheric science Palaeoclimate Life Sciences article 2018 ftunisfloridatam 2022-01-20T18:39:53Z Satellite imagery reveals flowstripes on Foundation Ice Stream parallel to ice flow, and meandering features on the ice-shelf that cross-cut ice flow and are thought to be formed by water exiting a well-organised subglacial system. Here, ice-penetrating radar data show flow-parallel hard-bed landforms beneath the grounded ice, and channels incised upwards into the ice shelf beneath meandering surface channels. As the ice transitions to flotation, the ice shelf incorporates a corrugation resulting from the landforms. Radar reveals the presence of subglacial water alongside the landforms, indicating a well-organised drainage system in which water exits the ice sheet as a point source, mixes with cavity water and incises upwards into a corrugation peak, accentuating the corrugation downstream. Hard-bedded landforms influence both subglacial hydrology and ice-shelf structure and, as they are known to be widespread on formerly glaciated terrain, their influence on the ice-sheet-shelf transition could be more widespread than thought previously. Subglacial landforms, formed by glacial processes operating over long timescales, influence ice dynamics. Here, the authors show how mega-scale landforms at an Antarctic ice stream grounding zone modulate basal water flow, causing extensive channels in the ice shelf downstream that may impact its structure. Article in Journal/Newspaper Antarc* Antarctic Foundation Ice Stream Ice Sheet Ice Shelf Digital Commons University of South Florida (USF) Antarctic Foundation Ice Stream ENVELOPE(-60.000,-60.000,-83.250,-83.250) |
institution |
Open Polar |
collection |
Digital Commons University of South Florida (USF) |
op_collection_id |
ftunisfloridatam |
language |
unknown |
topic |
Cryospheric science Palaeoclimate Life Sciences |
spellingShingle |
Cryospheric science Palaeoclimate Life Sciences Jeofry, Hafeez Ross, Neil Le Brocq, Anne Graham, Alastair G. C. Li, Jilu Gogineni, Prasad Morlighem, Mathieu Jordan, Thomas Siegert, Martin J. Hard Rock Landforms Generate 130 km Ice Shelf Channels through Water Focusing in Basal Corrugations |
topic_facet |
Cryospheric science Palaeoclimate Life Sciences |
description |
Satellite imagery reveals flowstripes on Foundation Ice Stream parallel to ice flow, and meandering features on the ice-shelf that cross-cut ice flow and are thought to be formed by water exiting a well-organised subglacial system. Here, ice-penetrating radar data show flow-parallel hard-bed landforms beneath the grounded ice, and channels incised upwards into the ice shelf beneath meandering surface channels. As the ice transitions to flotation, the ice shelf incorporates a corrugation resulting from the landforms. Radar reveals the presence of subglacial water alongside the landforms, indicating a well-organised drainage system in which water exits the ice sheet as a point source, mixes with cavity water and incises upwards into a corrugation peak, accentuating the corrugation downstream. Hard-bedded landforms influence both subglacial hydrology and ice-shelf structure and, as they are known to be widespread on formerly glaciated terrain, their influence on the ice-sheet-shelf transition could be more widespread than thought previously. Subglacial landforms, formed by glacial processes operating over long timescales, influence ice dynamics. Here, the authors show how mega-scale landforms at an Antarctic ice stream grounding zone modulate basal water flow, causing extensive channels in the ice shelf downstream that may impact its structure. |
format |
Article in Journal/Newspaper |
author |
Jeofry, Hafeez Ross, Neil Le Brocq, Anne Graham, Alastair G. C. Li, Jilu Gogineni, Prasad Morlighem, Mathieu Jordan, Thomas Siegert, Martin J. |
author_facet |
Jeofry, Hafeez Ross, Neil Le Brocq, Anne Graham, Alastair G. C. Li, Jilu Gogineni, Prasad Morlighem, Mathieu Jordan, Thomas Siegert, Martin J. |
author_sort |
Jeofry, Hafeez |
title |
Hard Rock Landforms Generate 130 km Ice Shelf Channels through Water Focusing in Basal Corrugations |
title_short |
Hard Rock Landforms Generate 130 km Ice Shelf Channels through Water Focusing in Basal Corrugations |
title_full |
Hard Rock Landforms Generate 130 km Ice Shelf Channels through Water Focusing in Basal Corrugations |
title_fullStr |
Hard Rock Landforms Generate 130 km Ice Shelf Channels through Water Focusing in Basal Corrugations |
title_full_unstemmed |
Hard Rock Landforms Generate 130 km Ice Shelf Channels through Water Focusing in Basal Corrugations |
title_sort |
hard rock landforms generate 130 km ice shelf channels through water focusing in basal corrugations |
publisher |
Digital Commons @ University of South Florida |
publishDate |
2018 |
url |
https://digitalcommons.usf.edu/msc_facpub/1525 https://digitalcommons.usf.edu/cgi/viewcontent.cgi?article=2535&context=msc_facpub |
long_lat |
ENVELOPE(-60.000,-60.000,-83.250,-83.250) |
geographic |
Antarctic Foundation Ice Stream |
geographic_facet |
Antarctic Foundation Ice Stream |
genre |
Antarc* Antarctic Foundation Ice Stream Ice Sheet Ice Shelf |
genre_facet |
Antarc* Antarctic Foundation Ice Stream Ice Sheet Ice Shelf |
op_source |
Marine Science Faculty Publications |
op_relation |
https://digitalcommons.usf.edu/msc_facpub/1525 https://digitalcommons.usf.edu/cgi/viewcontent.cgi?article=2535&context=msc_facpub |
op_rights |
http://creativecommons.org/licenses/by/4.0/ |
op_rightsnorm |
CC-BY |
_version_ |
1766275205950341120 |