| DOI: | 10.1002/2016GL067697
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| 论文题名: | Fluvial supraglacial landscape evolution on the Greenland Ice Sheet |
| 作者: | Karlstrom L.; Yang K.
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| 刊名: | Geophysical Research Letters
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| ISSN: | 0094-9238
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| EISSN: | 1944-8969
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| 出版年: | 2016
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| 卷: | 43, 期:6 | | 起始页码: | 2683
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| 结束页码: | 2692
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| 语种: | 英语
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| 英文关键词: | glacial hydrology
; landscape evolution
; supraglacial streams
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| Scopus关键词: | Catchments
; Erosion
; Glaciers
; Surface topography
; Topography
; Digital elevation model
; Dynamic topography
; Glacial hydrology
; Greenland Ice Sheet
; Landscape evolutions
; Longitudinal profile
; Stream longitudinal profiles
; Supraglacial streams
; Ice
; digital elevation model
; drainage basin
; glacial hydrology
; ice flow
; ice thickness
; landscape evolution
; power law
; stream
; topography
; Arctic
; Greenland
; Greenland Ice Sheet
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| 英文摘要: | Supraglacial stream networks incise via thermal erosion of underlying ice, reflecting a balance between localized fluvial incision and dynamic topography from underlying ice flow. We analyze high-resolution digital elevation models of the ice surface and bedrock in the southwest Greenland Ice Sheet from 1000-1600 m elevation to quantify the importance of fluvial erosion. At wavelengths greater than ice thickness, bedrock dominates surface topography so supraglacial drainage basins are fixed spatially. At smaller wavelengths, fluvial erosion significantly affects topography. Stream longitudinal profiles exhibit positive mean curvature and consistent power law scaling between local channel slope and drainage area, suggestive of adjustment toward topographic steady state. We interpret these observations with a model for fluvial thermal erosion on top of a flowing ice substrate that predicts concave up steady state longitudinal profiles, where average concavity is most sensitive to melt rate and the relative magnitudes of ice flow and fluvial erosion. ©2016. American Geophysical Union. All Rights Reserved. |
| URL: | https://www.scopus.com/inward/record.uri?eid=2-s2.0-84984999036&doi=10.1002%2f2016GL067697&partnerID=40&md5=b6be0ad996518c14b634fe6299640606
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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/10201
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| Appears in Collections: | 科学计划与规划
气候变化与战略
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作者单位: | Department of Geological Sciences, University of Oregon, Eugene, OR, United States
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| Recommended Citation: | |
Karlstrom L.,Yang K.. Fluvial supraglacial landscape evolution on the Greenland Ice Sheet[J]. Geophysical Research Letters,2016-01-01,43(6).
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