Global S&T Development Trend Analysis Platform of Resources and Environment
DOI | 10.1029/2018GL080620 |
Surface Expression of Basal and Englacial Features, Properties, and Processes of the Greenland Ice Sheet | |
Cooper, M. A.1; Jordan, T. M.1,2; Siegert, M. J.3,4; Bamber, J. L.1 | |
2019-01-28 | |
发表期刊 | GEOPHYSICAL RESEARCH LETTERS
![]() |
ISSN | 0094-8276 |
EISSN | 1944-8007 |
出版年 | 2019 |
卷号 | 46期号:2页码:783-793 |
文章类型 | Article |
语种 | 英语 |
国家 | England; USA |
英文摘要 | Radar-sounding surveys measuring ice thickness in Greenland have enabled an increasingly "complete" knowledge of basal topography and glaciological processes. Where such observations are spatially limited, bed elevation has been interpolated through mass conservation or kriging. Ordinary kriging fails to resolve anisotropy in bed geometry, however, leaving complex topography misrepresented in elevation models of the ice sheet bed. Here, we demonstrate the potential of new high-resolution (<= 5 m) surface topography data (ArcticDEM) to provide enhanced insight into basal and englacial geometry and processes. Notable surface features, quantified via residual surface elevation, are observed coincident with documented subglacial channels, and new, smaller-scale tributaries (<2,000 m in width) and valley-like structures are clearly identified. Residual surface elevation also allows the extent of basal ice units to be mapped, which in conjunction with radar data indicate that they act as "false bottoms," likely due to a rheological contrast in the ice column. Plain Language Summary Newly available high-resolution (<= 5 m) surface elevation maps of the Greenland Ice Sheet present a useful lens for examining and exploring the subglacial landscape, as well as the physical processes operating subglacially and englacially. Where radar data, which measure the subsurface geometry and properties, are sparse, we show how surface expressions can be used to enable effective interpolation between sets of bed data, allowing enhanced appreciation of ice sheet processes and boundary conditions. We also show that a subset of surface expressions originate from englacial slip surfaces or "false bottoms," allowing the extrapolation of the 2-D areal/horizontal extent of these features, not previously possible from radar flight lines alone. |
领域 | 气候变化 |
收录类别 | SCI-E |
WOS记录号 | WOS:000458607400029 |
WOS关键词 | THERMAL STATE ; RADAR ; BENEATH ; GLACIER ; TOPOGRAPHY ; ROUGHNESS ; WATER ; SCATTERING ; RESOLUTION ; EROSION |
WOS类目 | Geosciences, Multidisciplinary |
WOS研究方向 | Geology |
引用统计 | |
文献类型 | 期刊论文 |
条目标识符 | http://119.78.100.173/C666/handle/2XK7JSWQ/27709 |
专题 | 气候变化 |
作者单位 | 1.Univ Bristol, Sch Geog Sci, Bristol Glaciol Ctr, Bristol, Avon, England; 2.Stanford Univ, Dept Geophys, Stanford, CA 94305 USA; 3.Imperial Coll London, Grantham Inst Climate Change, London, England; 4.Imperial Coll London, Dept Earth Sci & Engn, London, England |
推荐引用方式 GB/T 7714 | Cooper, M. A.,Jordan, T. M.,Siegert, M. J.,et al. Surface Expression of Basal and Englacial Features, Properties, and Processes of the Greenland Ice Sheet[J]. GEOPHYSICAL RESEARCH LETTERS,2019,46(2):783-793. |
APA | Cooper, M. A.,Jordan, T. M.,Siegert, M. J.,&Bamber, J. L..(2019).Surface Expression of Basal and Englacial Features, Properties, and Processes of the Greenland Ice Sheet.GEOPHYSICAL RESEARCH LETTERS,46(2),783-793. |
MLA | Cooper, M. A.,et al."Surface Expression of Basal and Englacial Features, Properties, and Processes of the Greenland Ice Sheet".GEOPHYSICAL RESEARCH LETTERS 46.2(2019):783-793. |
条目包含的文件 | 条目无相关文件。 |
除非特别说明,本系统中所有内容都受版权保护,并保留所有权利。
修改评论