Diverse Landscapes Beneath Pine Island Glacier Influence Ice Flow
The retreating Pine Island Glacier (PIG), West Antarctica, presently contributes ~5–10% of global sea-level rise. PIG’s retreat rate has increased in recent decades with associated thinning migrating upstream into tributaries feeding the main glacier trunk. To project future change requires modellin...
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ftunisfloridatam:oai:digitalcommons.usf.edu:msc_facpub-2538 2023-05-15T14:04:11+02:00 Diverse Landscapes Beneath Pine Island Glacier Influence Ice Flow Bingham, Robert G. Vaughan, David G. King, Edward C. Davies, Damon Cornford, Stephen L. Smith, Andrew M. Arthern, Robert J. Brisbourne, Alex M. De Rydt, Rydt, Jan Graham, Alastair G. C. Spagnolo, Matteo Marsh, Oliver J. Shean, David E. 2017-01-01T08:00:00Z application/pdf https://digitalcommons.usf.edu/msc_facpub/1578 https://digitalcommons.usf.edu/cgi/viewcontent.cgi?article=2538&context=msc_facpub unknown Digital Commons @ University of South Florida https://digitalcommons.usf.edu/msc_facpub/1578 https://digitalcommons.usf.edu/cgi/viewcontent.cgi?article=2538&context=msc_facpub http://creativecommons.org/licenses/by/4.0/ CC-BY Marine Science Faculty Publications Cryospheric science Geomorphology Geophysics Life Sciences article 2017 ftunisfloridatam 2022-01-20T18:39:43Z The retreating Pine Island Glacier (PIG), West Antarctica, presently contributes ~5–10% of global sea-level rise. PIG’s retreat rate has increased in recent decades with associated thinning migrating upstream into tributaries feeding the main glacier trunk. To project future change requires modelling that includes robust parameterisation of basal traction, the resistance to ice flow at the bed. However, most ice-sheet models estimate basal traction from satellite-derived surface velocity, without a priori knowledge of the key processes from which it is derived, namely friction at the ice-bed interface and form drag, and the resistance to ice flow that arises as ice deforms to negotiate bed topography. Here, we present high-resolution maps, acquired using ice-penetrating radar, of the bed topography across parts of PIG. Contrary to lower-resolution data currently used for ice-sheet models, these data show a contrasting topography across the ice-bed interface. We show that these diverse subglacial landscapes have an impact on ice flow, and present a challenge for modelling ice-sheet evolution and projecting global sea-level rise from ice-sheet loss. Projecting the future retreat and thus global sea level contributions of Antarctica’s Pine Island Glacier is hampered by a poor grasp of what controls flow at the ice base. Here, via high-resolution ice-radar imaging, the authors show diverse landscapes beneath the glacier fundamentally influence ice flow. Article in Journal/Newspaper Antarc* Antarctica Ice Sheet Pine Island Pine Island Glacier West Antarctica Digital Commons University of South Florida (USF) West Antarctica Pine Island Glacier ENVELOPE(-101.000,-101.000,-75.000,-75.000) |
institution |
Open Polar |
collection |
Digital Commons University of South Florida (USF) |
op_collection_id |
ftunisfloridatam |
language |
unknown |
topic |
Cryospheric science Geomorphology Geophysics Life Sciences |
spellingShingle |
Cryospheric science Geomorphology Geophysics Life Sciences Bingham, Robert G. Vaughan, David G. King, Edward C. Davies, Damon Cornford, Stephen L. Smith, Andrew M. Arthern, Robert J. Brisbourne, Alex M. De Rydt, Rydt, Jan Graham, Alastair G. C. Spagnolo, Matteo Marsh, Oliver J. Shean, David E. Diverse Landscapes Beneath Pine Island Glacier Influence Ice Flow |
topic_facet |
Cryospheric science Geomorphology Geophysics Life Sciences |
description |
The retreating Pine Island Glacier (PIG), West Antarctica, presently contributes ~5–10% of global sea-level rise. PIG’s retreat rate has increased in recent decades with associated thinning migrating upstream into tributaries feeding the main glacier trunk. To project future change requires modelling that includes robust parameterisation of basal traction, the resistance to ice flow at the bed. However, most ice-sheet models estimate basal traction from satellite-derived surface velocity, without a priori knowledge of the key processes from which it is derived, namely friction at the ice-bed interface and form drag, and the resistance to ice flow that arises as ice deforms to negotiate bed topography. Here, we present high-resolution maps, acquired using ice-penetrating radar, of the bed topography across parts of PIG. Contrary to lower-resolution data currently used for ice-sheet models, these data show a contrasting topography across the ice-bed interface. We show that these diverse subglacial landscapes have an impact on ice flow, and present a challenge for modelling ice-sheet evolution and projecting global sea-level rise from ice-sheet loss. Projecting the future retreat and thus global sea level contributions of Antarctica’s Pine Island Glacier is hampered by a poor grasp of what controls flow at the ice base. Here, via high-resolution ice-radar imaging, the authors show diverse landscapes beneath the glacier fundamentally influence ice flow. |
format |
Article in Journal/Newspaper |
author |
Bingham, Robert G. Vaughan, David G. King, Edward C. Davies, Damon Cornford, Stephen L. Smith, Andrew M. Arthern, Robert J. Brisbourne, Alex M. De Rydt, Rydt, Jan Graham, Alastair G. C. Spagnolo, Matteo Marsh, Oliver J. Shean, David E. |
author_facet |
Bingham, Robert G. Vaughan, David G. King, Edward C. Davies, Damon Cornford, Stephen L. Smith, Andrew M. Arthern, Robert J. Brisbourne, Alex M. De Rydt, Rydt, Jan Graham, Alastair G. C. Spagnolo, Matteo Marsh, Oliver J. Shean, David E. |
author_sort |
Bingham, Robert G. |
title |
Diverse Landscapes Beneath Pine Island Glacier Influence Ice Flow |
title_short |
Diverse Landscapes Beneath Pine Island Glacier Influence Ice Flow |
title_full |
Diverse Landscapes Beneath Pine Island Glacier Influence Ice Flow |
title_fullStr |
Diverse Landscapes Beneath Pine Island Glacier Influence Ice Flow |
title_full_unstemmed |
Diverse Landscapes Beneath Pine Island Glacier Influence Ice Flow |
title_sort |
diverse landscapes beneath pine island glacier influence ice flow |
publisher |
Digital Commons @ University of South Florida |
publishDate |
2017 |
url |
https://digitalcommons.usf.edu/msc_facpub/1578 https://digitalcommons.usf.edu/cgi/viewcontent.cgi?article=2538&context=msc_facpub |
long_lat |
ENVELOPE(-101.000,-101.000,-75.000,-75.000) |
geographic |
West Antarctica Pine Island Glacier |
geographic_facet |
West Antarctica Pine Island Glacier |
genre |
Antarc* Antarctica Ice Sheet Pine Island Pine Island Glacier West Antarctica |
genre_facet |
Antarc* Antarctica Ice Sheet Pine Island Pine Island Glacier West Antarctica |
op_source |
Marine Science Faculty Publications |
op_relation |
https://digitalcommons.usf.edu/msc_facpub/1578 https://digitalcommons.usf.edu/cgi/viewcontent.cgi?article=2538&context=msc_facpub |
op_rights |
http://creativecommons.org/licenses/by/4.0/ |
op_rightsnorm |
CC-BY |
_version_ |
1766275204826267648 |