气候变化领域集成服务门户(CCPortal): High-resolution boundary conditions of an old ice target near Dome C, Antarctica

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DOI	10.5194/tc-11-1897-2017
	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.
发表日期	2017
ISSN	19940416
卷号	11 期号:4
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 We combined new ice thickness data derived from an airborne coherent radar sounder with unpublished data that was in part unavailable for earlier compilations, and we were able to remove older data with high positional uncertainties.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.
学科领域	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
语种	英语
scopus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
来源期刊	Cryosphere
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/119357
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, 38041, France; Université Grenoble Alpes, IGE (UMR5183), Grenoble, 38041, 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
推荐引用方式 GB/T 7714	Young D.A.,Roberts J.L.,Ritz C.,et al. High-resolution boundary conditions of an old ice target near Dome C, Antarctica[J],2017,11(4).
APA	Young D.A..,Roberts J.L..,Ritz C..,Frezzotti M..,Quartini E..,...&Blankenship D.D..(2017).High-resolution boundary conditions of an old ice target near Dome C, Antarctica.Cryosphere,11(4).
MLA	Young D.A.,et al."High-resolution boundary conditions of an old ice target near Dome C, Antarctica".Cryosphere 11.4(2017).