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 We combined new ice thickness data derived from an airborne coherent radar sounder with unpublished data that was in par...
| Main Authors: | , , , , , , , , , , , |
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| Format: | Article |
| Language: | English |
| Published: |
Copernicus Publications
2017-08-01
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| Series: | The Cryosphere |
| Online Access: | https://www.the-cryosphere.net/11/1897/2017/tc-11-1897-2017.pdf |
| _version_ | 1818149294788575232 |
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| author | D. A. Young J. L. Roberts J. L. Roberts C. Ritz C. Ritz M. Frezzotti E. Quartini E. Quartini M. G. P. Cavitte M. G. P. Cavitte C. R. Tozer D. Steinhage S. Urbini H. F. J. Corr T. van Ommen T. van Ommen D. D. Blankenship |
| author_facet | D. A. Young J. L. Roberts J. L. Roberts C. Ritz C. Ritz M. Frezzotti E. Quartini E. Quartini M. G. P. Cavitte M. G. P. Cavitte C. R. Tozer D. Steinhage S. Urbini H. F. J. Corr T. van Ommen T. van Ommen D. D. Blankenship |
| author_sort | D. A. Young |
| collection | DOAJ |
| 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from an airborne coherent radar sounder with unpublished data that was in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.
<br><br>
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. |
| first_indexed | 2024-12-11T13:04:45Z |
| format | Article |
| id | doaj.art-9df5617305a244ae82e23fc9ae07c9c7 |
| institution | Directory Open Access Journal |
| issn | 1994-0416 1994-0424 |
| language | English |
| last_indexed | 2024-12-11T13:04:45Z |
| publishDate | 2017-08-01 |
| publisher | Copernicus Publications |
| record_format | Article |
| series | The Cryosphere |
| spelling | doaj.art-9df5617305a244ae82e23fc9ae07c9c72022-12-22T01:06:21ZengCopernicus PublicationsThe Cryosphere1994-04161994-04242017-08-01111897191110.5194/tc-11-1897-2017High-resolution boundary conditions of an old ice target near Dome C, AntarcticaD. A. Young0J. L. Roberts1J. L. Roberts2C. Ritz3C. Ritz4M. Frezzotti5E. Quartini6E. Quartini7M. G. P. Cavitte8M. G. P. Cavitte9C. R. Tozer10D. Steinhage11S. Urbini12H. F. J. Corr13T. van Ommen14T. van Ommen15D. D. Blankenship16University of Texas Institute for Geophysics, Jackson School of Geosciences, University of Texas at Austin, Austin, Texas, USAAustralian Antarctic Division, Kingston, AustraliaAntarctic Climate and Ecosystems CRC, Hobart, AustraliaCNRS, IGE (UMR5183), 38041 Grenoble, FranceUniversité Grenoble Alpes, IGE (UMR5183), 38041 Grenoble, FranceENEA, Rome, ItalyUniversity of Texas Institute for Geophysics, Jackson School of Geosciences, University of Texas at Austin, Austin, Texas, USADepartment of Geological Sciences, Jackson School of Geosciences, University of Texas at Austin, Austin, Texas, USAUniversity of Texas Institute for Geophysics, Jackson School of Geosciences, University of Texas at Austin, Austin, Texas, USADepartment of Geological Sciences, Jackson School of Geosciences, University of Texas at Austin, Austin, Texas, USAAntarctic Climate and Ecosystems CRC, Hobart, AustraliaAlfred Wegener Institute Helmholtz Centre for Polar and Marine Research, Bremerhaven, GermanyIstituto Nazionale di Geofisica e Vulcanologia, Rome, ItalyBritish Antarctic Survey, Cambridge, UKAustralian Antarctic Division, Kingston, AustraliaAntarctic Climate and Ecosystems CRC, Hobart, AustraliaUniversity of Texas Institute for Geophysics, Jackson School of Geosciences, University of Texas at Austin, Austin, Texas, USAA 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. <br><br> 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.https://www.the-cryosphere.net/11/1897/2017/tc-11-1897-2017.pdf |
| spellingShingle | D. A. Young J. L. Roberts J. L. Roberts C. Ritz C. Ritz M. Frezzotti E. Quartini E. Quartini M. G. P. Cavitte M. G. P. Cavitte C. R. Tozer D. Steinhage S. Urbini H. F. J. Corr T. van Ommen T. van Ommen D. D. Blankenship High-resolution boundary conditions of an old ice target near Dome C, Antarctica The Cryosphere |
| title | 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_short | 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 |
| url | https://www.the-cryosphere.net/11/1897/2017/tc-11-1897-2017.pdf |
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