DOI: 10.5194/tc-10-1883-2016
Scopus记录号: 2-s2.0-84984636108
论文题名: Persistence and variability of ice-stream grounding lines on retrograde bed slopes
作者: Robel A ; A ; , Schoof C ; , Tziperman E
刊名: Cryosphere
ISSN: 19940416
出版年: 2016
卷: 10, 期: 4 起始页码: 1883
结束页码: 1896
语种: 英语
英文关键词: grounding line
; ice stream
; numerical model
; oscillation
; persistence
; spatiotemporal analysis
; subglacial environment
; Antarctica
; West Antarctica
英文摘要: In many ice streams, basal resistance varies in space and time due to the dynamically evolving properties of subglacial till. These variations can cause internally generated oscillations in ice-stream flow. However, the potential for such variations in basal properties is not considered by conventional theories of grounding-line stability on retrograde bed slopes, which assume that bed properties are static in time. Using a flow-line model, we show how internally generated, transient variations in ice-stream state interact with retrograde bed slopes. In contrast to predictions from the theory of the marine ice-sheet instability, our simulated grounding line is able to persist and reverse direction of migration on a retrograde bed when undergoing oscillations in the grounding-line position. In turn, the presence of a retrograde bed may also suppress or reduce the amplitude of internal oscillations in ice-stream state. We explore the physical mechanisms responsible for these behaviors and discuss the implications for observed grounding-line migration in West Antarctica. © 2016 Author(s). Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/75093
Appears in Collections: 影响、适应和脆弱性 气候变化与战略
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作者单位: Department of Earth and Planetary Sciences, Harvard University, Cambridge, MA, United States; Department of Earth and Ocean Sciences, University of British Columbia, Vancouver, BC, Canada; Division of Geological and Planetary Sciences, California Institute of Technology, Pasadena, CA, United States; Department of the Geophysical Sciences, University of Chicago, Chicago, IL, United States
Recommended Citation:
Robel A,A,, Schoof C,et al. Persistence and variability of ice-stream grounding lines on retrograde bed slopes[J]. Cryosphere,2016-01-01,10(4)