globalchange  > 影响、适应和脆弱性
DOI: 10.5194/tc-11-1897-2017
Scopus记录号: 2-s2.0-85027464102
论文题名:
High-resolution boundary conditions of an old ice target near Dome C, Antarctica
作者: 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
刊名: Cryosphere
ISSN: 19940416
出版年: 2017
卷: 11, 期:4
起始页码: 1897
结束页码: 1911
语种: 英语
英文关键词: boundary condition ; CryoSat ; data processing ; digital elevation model ; Doppler radar ; glacial lake ; ice thickness ; proxy climate record ; radar altimetry ; satellite data ; surface roughness ; Antarctic Ice Sheet ; Antarctica ; Dome Concordia ; East Antarctic Ice Sheet ; East Antarctica
英文摘要: 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 We combined new ice thickness data derived from an airborne coherent radar sounder with unpublished data that was in part unavailable for earlier compilations, and we were able to remove older data with high positional uncertainties.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. © Author(s) 2017.
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/75515
Appears in Collections:影响、适应和脆弱性
气候变化与战略

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作者单位: University of Texas Institute for Geophysics, Jackson School of Geosciences, University of Texas at Austin, Austin, TX, United States; Australian Antarctic Division, Kingston, TAS, Australia; Antarctic Climate and Ecosystems CRC, Hobart, TAS, Australia; CNRS, IGE (UMR5183), Grenoble, France; Université Grenoble Alpes, IGE (UMR5183), Grenoble, France; ENEA, Rome, Italy; Department of Geological Sciences, Jackson School of Geosciences, University of Texas at Austin, Austin, TX, United States; Alfred Wegener Institute Helmholtz Centre for Polar and Marine Research, Bremerhaven, Germany; Istituto Nazionale di Geofisica e Vulcanologia, Rome, Italy; British Antarctic Survey, Cambridge, United Kingdom

Recommended Citation:
Young D,A,, Roberts J,et al. High-resolution boundary conditions of an old ice target near Dome C, Antarctica[J]. Cryosphere,2017-01-01,11(4)
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