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 We combined new ice thickness data derived from an airborne coherent radar sounder with unpublished data that was in part u...
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ftunivroma3iris:oai:iris.uniroma3.it:11590/353560 2024-02-27T08:34:58+00:00 High-resolution boundary conditions of an old ice target near Dome C, Antarctica Young D. A. Roberts J. L. Ritz C. Frezzotti M. Quartini E. Cavitte M. G. P. Tozer C. R. Steinhage D. Urbini S. Corr H. F. J. Van Ommen T. Blankenship D. D. Young, D. A. Roberts, J. L. Ritz, C. Frezzotti, M. Quartini, E. Cavitte, M. G. P. Tozer, C. R. Steinhage, D. Urbini, S. Corr, H. F. J. Van Ommen, T. Blankenship, D. D. 2017 http://hdl.handle.net/11590/353560 https://doi.org/10.5194/tc-11-1897-2017 http://www.the-cryosphere.net/volumes_and_issues.html eng eng info:eu-repo/semantics/altIdentifier/wos/WOS:000407640200001 volume:11 issue:4 firstpage:1897 lastpage:1911 numberofpages:15 journal:THE CRYOSPHERE http://hdl.handle.net/11590/353560 doi:10.5194/tc-11-1897-2017 info:eu-repo/semantics/altIdentifier/scopus/2-s2.0-85027464102 http://www.the-cryosphere.net/volumes_and_issues.html info:eu-repo/semantics/article 2017 ftunivroma3iris https://doi.org/10.5194/tc-11-1897-2017 2024-01-31T17:41:13Z 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 We combined new ice thickness data derived from an airborne coherent radar sounder with unpublished data that was in part unavailable for earlier compilations, and we were able to remove older data with high positional uncertainties.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 Anagrafe della Ricerca d'Ateneo (Universitá degli studi Roma Tre) Antarctic The Cryosphere 11 4 1897 1911 |
institution |
Open Polar |
collection |
Anagrafe della Ricerca d'Ateneo (Universitá degli studi Roma Tre) |
op_collection_id |
ftunivroma3iris |
language |
English |
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. |
author2 |
Young, D. A. Roberts, J. L. Ritz, C. Frezzotti, M. Quartini, E. Cavitte, M. G. P. Tozer, C. R. Steinhage, D. Urbini, S. Corr, H. F. J. Van Ommen, T. Blankenship, D. D. |
format |
Article in Journal/Newspaper |
author |
Young D. A. Roberts J. L. Ritz C. Frezzotti M. Quartini E. Cavitte M. G. P. Tozer C. R. Steinhage D. Urbini S. Corr H. F. J. Van Ommen T. Blankenship D. D. |
spellingShingle |
Young D. A. Roberts J. L. Ritz C. Frezzotti M. Quartini E. Cavitte M. G. P. Tozer C. R. Steinhage D. Urbini S. Corr H. F. J. Van Ommen T. Blankenship D. D. High-resolution boundary conditions of an old ice target near Dome C, Antarctica |
author_facet |
Young D. A. Roberts J. L. Ritz C. Frezzotti M. Quartini E. Cavitte M. G. P. Tozer C. R. Steinhage D. Urbini S. Corr H. F. J. Van Ommen T. Blankenship D. D. |
author_sort |
Young D. A. |
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 |
publishDate |
2017 |
url |
http://hdl.handle.net/11590/353560 https://doi.org/10.5194/tc-11-1897-2017 http://www.the-cryosphere.net/volumes_and_issues.html |
geographic |
Antarctic |
geographic_facet |
Antarctic |
genre |
Antarc* Antarctic Antarctica |
genre_facet |
Antarc* Antarctic Antarctica |
op_relation |
info:eu-repo/semantics/altIdentifier/wos/WOS:000407640200001 volume:11 issue:4 firstpage:1897 lastpage:1911 numberofpages:15 journal:THE CRYOSPHERE http://hdl.handle.net/11590/353560 doi:10.5194/tc-11-1897-2017 info:eu-repo/semantics/altIdentifier/scopus/2-s2.0-85027464102 http://www.the-cryosphere.net/volumes_and_issues.html |
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 |
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1792041349282791424 |