DOI: 10.1029/2017JF004561
Scopus记录号: 2-s2.0-85046785708
论文题名: Complex Basal Thermal Transition Near the Onset of Petermann Glacier, Greenland
作者: Chu W. ; Schroeder D.M. ; Seroussi H. ; Creyts T.T. ; Bell R.E.
刊名: Journal of Geophysical Research: Earth Surface
ISSN: 21699003
出版年: 2018
卷: 123, 期: 5 起始页码: 985
结束页码: 995
语种: 英语
英文关键词: Greenland Ice Sheet
; ice sheet modeling
; onset of fast flow
; Petermann Glacier
; radar sounding
; subglacial hydrology
Scopus关键词: basal temperature
; glacial hydrology
; glacier
; ice sheet
; modeling
; radar
; thermal regime
; thermomechanics
; Arctic
; Greenland
; Greenland Ice Sheet
; Petermann Glacier
英文摘要: The basal thermal regime of ice sheets exerts a strong control on ice-sheet stability and the onset of rapidly streaming flow. However, the nature of this thermal transition where sliding initiates is largely unconstrained by geophysical observations. In the Greenland Ice Sheet, topographic troughs or elevated geothermal heat fluxes typically define the onset of outlet glaciers. In contrast, Petermann Glacier in Northern Greenland does not have any distinct bed troughs or localized geothermal heating associated with its onset, making it an ideal site to investigate the basal thermal state and examine its role in the onset of Petermann Glacier. Here we use radar bed reflectivity and an ice-sheet thermomechanical model to examine the basal thermal regime beneath Petermann Glacier. Our results reveal a complex thermal transition near the onset of Petermann Glacier. As the bed shifts from largely frozen to largely thawed with increasing distances from the ice divide, our results show that this thermal transition happens through alternating bands of frozen and thawed bands. The complex thermal state across the onset region suggests that lateral meltwater injection and local meltwater production determine the location of Petermann Glacier. Given the lack of topographic pinning at the onset location, the upstream margin of Petermann is vulnerable to migrate depending on a combination of advective cooling and meltwater supply from the interior of the ice sheet. ©2018. American Geophysical Union. All Rights Reserved. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/114025
Appears in Collections: 气候减缓与适应
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作者单位: Department of Geophysics, School of Earth, Energy and Environmental Sciences, Stanford University, Stanford, CA, United States; Department of Electrical Engineering, School of Engineering, Stanford University, Stanford, CA, United States; Jet Propulsion Laboratory, California Institute of Technology, Pasadena, CA, United States; Division of Marine Geology and Geophysics Division, Lamont-Doherty Earth Observatory of Columbia University, Palisades, NY, United States
Recommended Citation:
Chu W.,Schroeder D.M.,Seroussi H.,et al. Complex Basal Thermal Transition Near the Onset of Petermann Glacier, Greenland[J]. Journal of Geophysical Research: Earth Surface,2018-01-01,123(5)