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 We combined new ice thickness data derived from an airborne coherent radar sounder with unpublished data that was in part u...
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ftdoajarticles:oai:doaj.org/article:9df5617305a244ae82e23fc9ae07c9c7 2023-05-15T14:03:33+02:00 High-resolution boundary conditions of an old ice target near Dome C, Antarctica D. A. Young J. L. Roberts C. Ritz M. Frezzotti E. Quartini M. G. P. Cavitte C. R. Tozer D. Steinhage S. Urbini H. F. J. Corr T. van Ommen D. D. Blankenship 2017-08-01T00:00:00Z https://doi.org/10.5194/tc-11-1897-2017 https://doaj.org/article/9df5617305a244ae82e23fc9ae07c9c7 EN eng Copernicus Publications https://www.the-cryosphere.net/11/1897/2017/tc-11-1897-2017.pdf https://doaj.org/toc/1994-0416 https://doaj.org/toc/1994-0424 doi:10.5194/tc-11-1897-2017 1994-0416 1994-0424 https://doaj.org/article/9df5617305a244ae82e23fc9ae07c9c7 The Cryosphere, Vol 11, Pp 1897-1911 (2017) Environmental sciences GE1-350 Geology QE1-996.5 article 2017 ftdoajarticles https://doi.org/10.5194/tc-11-1897-2017 2022-12-31T01:47:27Z 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 We combined new ice thickness data derived from an airborne coherent radar sounder with unpublished data that was in part unavailable for earlier compilations, and we were able to remove older data with high positional uncertainties.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 The Cryosphere Directory of Open Access Journals: DOAJ Articles Antarctic The Cryosphere 11 4 1897 1911 |
institution |
Open Polar |
collection |
Directory of Open Access Journals: DOAJ Articles |
op_collection_id |
ftdoajarticles |
language |
English |
topic |
Environmental sciences GE1-350 Geology QE1-996.5 |
spellingShingle |
Environmental sciences GE1-350 Geology QE1-996.5 D. A. Young J. L. Roberts C. Ritz M. Frezzotti E. Quartini M. G. P. Cavitte C. R. Tozer D. Steinhage S. Urbini H. F. J. Corr T. van Ommen D. D. Blankenship High-resolution boundary conditions of an old ice target near Dome C, Antarctica |
topic_facet |
Environmental sciences GE1-350 Geology QE1-996.5 |
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 |
D. A. Young J. L. Roberts C. Ritz M. Frezzotti E. Quartini M. G. P. Cavitte C. R. Tozer D. Steinhage S. Urbini H. F. J. Corr T. van Ommen D. D. Blankenship |
author_facet |
D. A. Young J. L. Roberts C. Ritz M. Frezzotti E. Quartini M. G. P. Cavitte C. R. Tozer D. Steinhage S. Urbini H. F. J. Corr T. van Ommen D. D. Blankenship |
author_sort |
D. A. Young |
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 Publications |
publishDate |
2017 |
url |
https://doi.org/10.5194/tc-11-1897-2017 https://doaj.org/article/9df5617305a244ae82e23fc9ae07c9c7 |
geographic |
Antarctic |
geographic_facet |
Antarctic |
genre |
Antarc* Antarctic Antarctica The Cryosphere |
genre_facet |
Antarc* Antarctic Antarctica The Cryosphere |
op_source |
The Cryosphere, Vol 11, Pp 1897-1911 (2017) |
op_relation |
https://www.the-cryosphere.net/11/1897/2017/tc-11-1897-2017.pdf https://doaj.org/toc/1994-0416 https://doaj.org/toc/1994-0424 doi:10.5194/tc-11-1897-2017 1994-0416 1994-0424 https://doaj.org/article/9df5617305a244ae82e23fc9ae07c9c7 |
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_ |
1766274237196140544 |