DOI: 10.1016/j.epsl.2020.116543
论文题名: Interpretation of topography and bed properties beneath Thwaites Glacier, West Antarctica using seismic reflection methods
作者: Clyne E.R. ; Anandakrishnan S. ; Muto A. ; Alley R.B. ; Voigt D.E.
刊名: Earth and Planetary Science Letters
ISSN: 0012821X
出版年: 2020
卷: 550 语种: 英语
中文关键词: acoustic impedance
; bed character
; reflection seismic
; Thwaites Glacier
; till properties
; West Antarctica
英文关键词: Acoustic impedance
; Seismic waves
; Seismology
; Amplitude analysis
; Bedrock region
; Physical process
; Reflection seismic
; Seismic reflection method
; Spatial variability
; West antarctic ice sheets
; West antarctica
; Topography
; climate forcing
; data set
; future prospect
; glacier flow
; seismic data
; seismic reflection
; spatiotemporal analysis
; Antarctic Ice Sheet
; Antarctica
; Thwaites Glacier
; West Antarctic Ice Sheet
; West Antarctica
英文摘要: Thwaites Glacier (TG), West Antarctica, is losing mass in response to oceanic forcing. Future evolution could lead to deglaciation of the marine basins of the West Antarctic Ice Sheet, depending on ongoing and future climate forcings, but also on basal topography/bathymetry, basal properties, and physical processes operating within the grounding zone. Hence, it is important to know the distribution of bed types of TG's interior and grounding zone, and to incorporate them accurately in models in order to improve estimates of retreat rates and stability. Here we estimate properties of the bed by determining its acoustic impedance from amplitude analysis of reflection seismic data. We report on the results from two lines – a longitudinal (L-Line) and a transverse (N-Line) – on a central flowline of TG ∼100 km inland from the grounding zone. The data show considerable spatial variability in bed forms and properties, similar to results from a comparable survey farther inland. Notably, we find the same pattern here of hard (presumed bedrock) material on the stoss side of bumps and soft (presumed till) on the lee side. Physical understanding indicates the basal flow law describing motion over different regions of TG's bed likely varies from nearly-viscous over the bedrock regions to nearly-plastic over till regions, providing guidance for modeling. © 2020 Elsevier B.V. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/164925
Appears in Collections: 气候变化与战略
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作者单位: Dept. of Geosciences, the Earth and Environmental Systems Institute, The Pennsylvania State University, University Park, PA 16802, United States; Dept. of Earth and Environmental Sciences, Temple University, Philadelphia, PA, United States
Recommended Citation:
Clyne E.R.,Anandakrishnan S.,Muto A.,et al. Interpretation of topography and bed properties beneath Thwaites Glacier, West Antarctica using seismic reflection methods[J]. Earth and Planetary Science Letters,2020-01-01,550