DOI: 10.1002/2014GL061491
论文题名: Freezing of ridges and water networks preserves the Gamburtsev Subglacial Mountains for millions of years
作者: Creyts T.T. ; Ferraccioli F. ; Bell R.E. ; Wolovick M. ; Corr H. ; Rose K.C. ; Frearson N. ; Damaske D. ; Jordan T. ; Braaten D. ; Finn C.
刊名: Geophysical Research Letters
ISSN: 0094-9607
EISSN: 1944-9338
出版年: 2014
卷: 41, 期: 22 起始页码: 8114
结束页码: 8122
语种: 英语
英文关键词: Antarctica
; freezing
; glaciology
; ice sheet
Scopus关键词: Digital storage
; Erosion
; Freezing
; Glaciers
; Landforms
; Radio systems
; Antarctica
; Critical thickness
; Geophysical data
; glaciology
; Ice sheet
; Spatial and temporal patterns
; Steep topography
; Subglacial waters
; Ice
; bedrock
; data set
; Eocene
; erosion
; freezing
; geophysical method
; glaciology
; ice sheet
; ice thickness
; melting
; subglacial environment
; temporal analysis
; topography
; Antarctica
; East Antarctica
; Gamburtsev Mountains
英文摘要: Once an ice sheet grows beyond a critical thickness, the basal thermal regime favors melting and development of subglacial water networks. Subglacial water is necessary for bedrock erosion, but the exact mechanisms that lead to preservation of subglacial topography are unclear. Here we resolve the freezing mechanisms that lead to long-term, high-altitude preservation across the Gamburtsev Subglacial Mountains in East Antarctica. Analyses of a comprehensive geophysical data set reveal a large-scale water network along valley floors. The ice sheet often drives subglacial water up steep topography where it freezes along high ridges beneath thinner ice. Statistical tests of hypsometry show the Gamburtsevs resemble younger midlatitude mountains, indicating exceptional preservation. We conclude that the Gamburtsevs have been shielded from erosion since the latest Eocene (∼34 Ma). These freezing mechanisms likely account for the spatial and temporal patterns of erosion and preservation seen in other glaciated mountain ranges. © 2014. The Authors. URL: https://www.scopus.com/inward/record.uri?eid=2-s2.0-84923337298&doi=10.1002%2f2014GL061491&partnerID=40&md5=12d53c883802d22d650b68f23b9a5f4f
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/6871
Appears in Collections: 气候减缓与适应
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作者单位: Lamont-Doherty Earth Observatory, Columbia University, Palisades, NY, United States
Recommended Citation:
Creyts T.T.,Ferraccioli F.,Bell R.E.,et al. Freezing of ridges and water networks preserves the Gamburtsev Subglacial Mountains for millions of years[J]. Geophysical Research Letters,2014-01-01,41(22).