High-resolution boundary conditions of an old ice target near Dome C, Antarctica
A high-resolution (1 km line spacing) aerogeophysical survey was conducted over a region near the East Antarctic Ice Sheet's Dome C that may hold a 1.5 Myr climate record. We combined new ice thickness data derived from an airborne coherent radar sounder with unpublished data that was in part u...
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Language: | English |
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Online Access: | https://eprints.utas.edu.au/27015/ https://eprints.utas.edu.au/27015/1/122568%20final.pdf |
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ftunivtasmania:oai:eprints.utas.edu.au:27015 2023-05-15T13:31:52+02:00 High-resolution boundary conditions of an old ice target near Dome C, Antarctica Young, DA Roberts, JL Ritz, C Frezzotti, M Quartini, E Cavitte, MGP Tozer, CR Steinhage, D Urbini, S Corr, HFJ van Ommen, TD Blankenship, DD 2017 application/pdf https://eprints.utas.edu.au/27015/ https://eprints.utas.edu.au/27015/1/122568%20final.pdf en eng Copernicus GmbH https://eprints.utas.edu.au/27015/1/122568%20final.pdf Young, DA, Roberts, JL, Ritz, C, Frezzotti, M, Quartini, E, Cavitte, MGP, Tozer, CR orcid:0000-0001-8605-5907 , Steinhage, D, Urbini, S, Corr, HFJ, van Ommen, TD orcid:0000-0002-2463-1718 and Blankenship, DD 2017 , 'High-resolution boundary conditions of an old ice target near Dome C, Antarctica' , Cryosphere, vol. 11, no. 4 , pp. 1897-1911 , doi:10.5194/tc-11-1897-2017 <http://dx.doi.org/10.5194/tc-11-1897-2017>. glaciology Antarctica boundary conditions Dome C ice thickness sub-glacial lake Article PeerReviewed 2017 ftunivtasmania https://doi.org/10.5194/tc-11-1897-2017 2021-09-06T22:18:01Z A high-resolution (1 km line spacing) aerogeophysical survey was conducted over a region near the East Antarctic Ice Sheet's Dome C that may hold a 1.5 Myr climate record. We combined new ice thickness data derived from an airborne coherent radar sounder with unpublished data that was in part unavailable for earlier compilations, and we were able to remove older data with high positional uncertainties. We generated a revised high-resolution digital elevation model (DEM) to investigate the potential for an old ice record in this region, and used laser altimetry to confirm a Cryosat-2 derived DEM for inferring the glaciological state of the candidate area. By measuring the specularity content of the bed, we were able to find an additional 50 subglacial lakes near the candidate site, and by Doppler focusing the radar data, we were able to map out the roughness of the bed at length scales of hundreds of meters.We find that the primary candidate region contains elevated rough topography interspersed with scattered subglacial lakes and some regions of smoother bed. Free subglacial water appears to be restricted from bed overlain by ice thicknesses of less than 3000 m. A site near the ice divide was selected for further investigation. The high resolution of this ice thickness data set also allows us to explore the nature of ice thickness uncertainties in the context of radar geometry and processing. Article in Journal/Newspaper Antarc* Antarctic Antarctica University of Tasmania: UTas ePrints Antarctic Glacial Lake ENVELOPE(-129.463,-129.463,58.259,58.259) The Cryosphere 11 4 1897 1911 |
institution |
Open Polar |
collection |
University of Tasmania: UTas ePrints |
op_collection_id |
ftunivtasmania |
language |
English |
topic |
glaciology Antarctica boundary conditions Dome C ice thickness sub-glacial lake |
spellingShingle |
glaciology Antarctica boundary conditions Dome C ice thickness sub-glacial lake Young, DA Roberts, JL Ritz, C Frezzotti, M Quartini, E Cavitte, MGP Tozer, CR Steinhage, D Urbini, S Corr, HFJ van Ommen, TD Blankenship, DD High-resolution boundary conditions of an old ice target near Dome C, Antarctica |
topic_facet |
glaciology Antarctica boundary conditions Dome C ice thickness sub-glacial lake |
description |
A high-resolution (1 km line spacing) aerogeophysical survey was conducted over a region near the East Antarctic Ice Sheet's Dome C that may hold a 1.5 Myr climate record. We combined new ice thickness data derived from an airborne coherent radar sounder with unpublished data that was in part unavailable for earlier compilations, and we were able to remove older data with high positional uncertainties. We generated a revised high-resolution digital elevation model (DEM) to investigate the potential for an old ice record in this region, and used laser altimetry to confirm a Cryosat-2 derived DEM for inferring the glaciological state of the candidate area. By measuring the specularity content of the bed, we were able to find an additional 50 subglacial lakes near the candidate site, and by Doppler focusing the radar data, we were able to map out the roughness of the bed at length scales of hundreds of meters.We find that the primary candidate region contains elevated rough topography interspersed with scattered subglacial lakes and some regions of smoother bed. Free subglacial water appears to be restricted from bed overlain by ice thicknesses of less than 3000 m. A site near the ice divide was selected for further investigation. The high resolution of this ice thickness data set also allows us to explore the nature of ice thickness uncertainties in the context of radar geometry and processing. |
format |
Article in Journal/Newspaper |
author |
Young, DA Roberts, JL Ritz, C Frezzotti, M Quartini, E Cavitte, MGP Tozer, CR Steinhage, D Urbini, S Corr, HFJ van Ommen, TD Blankenship, DD |
author_facet |
Young, DA Roberts, JL Ritz, C Frezzotti, M Quartini, E Cavitte, MGP Tozer, CR Steinhage, D Urbini, S Corr, HFJ van Ommen, TD Blankenship, DD |
author_sort |
Young, DA |
title |
High-resolution boundary conditions of an old ice target near Dome C, Antarctica |
title_short |
High-resolution boundary conditions of an old ice target near Dome C, Antarctica |
title_full |
High-resolution boundary conditions of an old ice target near Dome C, Antarctica |
title_fullStr |
High-resolution boundary conditions of an old ice target near Dome C, Antarctica |
title_full_unstemmed |
High-resolution boundary conditions of an old ice target near Dome C, Antarctica |
title_sort |
high-resolution boundary conditions of an old ice target near dome c, antarctica |
publisher |
Copernicus GmbH |
publishDate |
2017 |
url |
https://eprints.utas.edu.au/27015/ https://eprints.utas.edu.au/27015/1/122568%20final.pdf |
long_lat |
ENVELOPE(-129.463,-129.463,58.259,58.259) |
geographic |
Antarctic Glacial Lake |
geographic_facet |
Antarctic Glacial Lake |
genre |
Antarc* Antarctic Antarctica |
genre_facet |
Antarc* Antarctic Antarctica |
op_relation |
https://eprints.utas.edu.au/27015/1/122568%20final.pdf Young, DA, Roberts, JL, Ritz, C, Frezzotti, M, Quartini, E, Cavitte, MGP, Tozer, CR orcid:0000-0001-8605-5907 , Steinhage, D, Urbini, S, Corr, HFJ, van Ommen, TD orcid:0000-0002-2463-1718 and Blankenship, DD 2017 , 'High-resolution boundary conditions of an old ice target near Dome C, Antarctica' , Cryosphere, vol. 11, no. 4 , pp. 1897-1911 , doi:10.5194/tc-11-1897-2017 <http://dx.doi.org/10.5194/tc-11-1897-2017>. |
op_doi |
https://doi.org/10.5194/tc-11-1897-2017 |
container_title |
The Cryosphere |
container_volume |
11 |
container_issue |
4 |
container_start_page |
1897 |
op_container_end_page |
1911 |
_version_ |
1766021729019232256 |