DOI: 10.1038/NGEO2980
论文题名: Formation of plateau landscapes on glaciated continental margins
作者: Egholm D.L. ; Jansen J.D. ; Brædstrup C.F. ; Pedersen V.K. ; Andersen J.L. ; Ugelvig S.V. ; Larsen N.K. ; Knudsen M.F.
刊名: Nature Geoscience
ISSN: 17520894
出版年: 2017
卷: 10, 期: 8 起始页码: 592
结束页码: 597
语种: 英语
Scopus关键词: Cenozoic
; continental margin
; fjord
; glaciation
; ice cover
; ice sheet
; landscape
; plateau
; subglacial environment
; Antarctica
; Arctic
; Atlantic Ocean
; Atlantic Ocean (North)
; Canada
; Greenland
; Norway
英文摘要: Low-relief plateaus separated by deeply incised fjords are hallmarks of glaciated, passive continental margins. Spectacular examples fringe the once ice-covered North Atlantic coasts of Greenland, Norway and Canada, but low-relief plateau landscapes also underlie present-day ice sheets in Antarctica and Greenland. Dissected plateaus have long been viewed as the outcome of selective linear erosion by ice sheets that focus incision in glacial troughs, leaving the intervening landscapes essentially unaffected. According to this hypothesis, the plateaus are remnants of preglacial low-relief topography. However, here we use computational experiments to show that, like fjords, plateaus are emergent properties of long-term ice-sheet erosion. Ice sheets can either increase or decrease subglacial relief depending on the wavelength of the underlying topography, and plateau topography arises dynamically from evolving feedbacks between topography, ice dynamics and erosion over million-year timescales. This new mechanistic explanation for plateau formation opens the possibility of plateaus contributing significantly to accelerated sediment flux at the onset of the late Cenozoic glaciations, before becoming stable later in the Quaternary. © 2017 Macmillan Publishers Limited, part of Springer Nature. All rights reserved. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/105735
Appears in Collections: 气候减缓与适应 科学计划与规划
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作者单位: Department of Geoscience, Aarhus University, Aarhus, Denmark; Institute of Earth and Environmental Science, University of Potsdam, Potsdam-Golm, Germany; Department of Earth Sciences, University of Bergen, Bjerknes Centre for Climate Research, Bergen, Norway
Recommended Citation:
Egholm D.L.,Jansen J.D.,Brædstrup C.F.,et al. Formation of plateau landscapes on glaciated continental margins[J]. Nature Geoscience,2017-01-01,10(8)