| DOI: | 10.1002/2014GL061645
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| 论文题名: | Airborne radar sounding evidence for deformable sediments and outcropping bedrock beneath Thwaites Glacier, West Antarctica |
| 作者: | Schroeder D.M.; Blankenship D.D.; Young D.A.; Witus A.E.; Anderson J.B.
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| 刊名: | Geophysical Research Letters
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| ISSN: | 0094-9685
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| EISSN: | 1944-9416
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| 出版年: | 2014
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| 卷: | 41, 期:20 | | 起始页码: | 7200
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| 结束页码: | 7208
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| 语种: | 英语
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| 英文关键词: | Amundsen Sea Embayment
; glacial landforms
; ice penetrating radar
; Pine Island Glacier
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| Scopus关键词: | Deformation
; Glaciers
; Ice
; Landforms
; Lithology
; Radar
; Sediments
; Amundsen Sea
; Bed configuration
; Continental shelves
; Downstream region
; Glacial landforms
; Penetrating radar
; Pine island glaciers
; Radar scattering
; Marine radar
; airborne sensing
; bathymetry
; bedrock
; data set
; geomorphology
; meltwater
; radar
; roughness
; sediment analysis
; Amundsen Sea
; Antarctica
; Pine Island Glacier
; Southern Ocean
; Thwaites Glacier
; West Antarctica
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| 英文摘要: | The geologic and morphologic records of prior ice sheet configurations show evidence of rapid, back-stepping, meltwater intensive retreats. However, the potential for such a retreat in a contemporary glacier depends on the lithology of the current ice sheet bed, which lies beneath kilometers of ice, making its physical properties difficult to constrain. We use radar sounding and marine bathymetry data to compare the bed configuration of Thwaites Glacier to the bed of paleo-Pine Island Glacier. Using observed and modeled radar scattering, we show that the tributaries and upper trunk of Thwaites Glacier are underlain by ice flow-aligned bedforms consistent with deformable sediment and that the lower trunk is grounded on a region of high bed roughness consistent with outcropping bedrock. This is the same configuration as paleo-Pine Island Glacier during its retreat across the inner continental shelf. Key Points Radar scattering shows upstream region with flow-aligned lineated bedformsRadar scattering shows downstream region with high bed roughnessMorphologies are consistent with upstream sediments and downstream bedrock ©2014. American Geophysical Union. All Rights Reserved. |
| URL: | https://www.scopus.com/inward/record.uri?eid=2-s2.0-84911411515&doi=10.1002%2f2014GL061645&partnerID=40&md5=0a01c33a8f0b232ff8547fe57556233a
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| Citation statistics: |
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| 资源类型: | 期刊论文
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| 标识符: | http://119.78.100.158/handle/2HF3EXSE/6949
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| Appears in Collections: | 气候减缓与适应
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作者单位: | Institute for Geophysics, University of Texas, Austin, TX, United States
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| Recommended Citation: | |
Schroeder D.M.,Blankenship D.D.,Young D.A.,et al. Airborne radar sounding evidence for deformable sediments and outcropping bedrock beneath Thwaites Glacier, West Antarctica[J]. Geophysical Research Letters,2014-01-01,41(20).
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