DOI: 10.5194/tc-8-1763-2014
Scopus记录号: 2-s2.0-84907463960
论文题名: Insights into ice stream dynamics through modelling their response to tidal forcing
作者: Rosier S ; H ; R ; , Gudmundsson G ; H ; , Green J ; A ; M
刊名: Cryosphere
ISSN: 19940416
出版年: 2014
卷: 8, 期: 5 起始页码: 1763
结束页码: 1775
语种: 英语
英文关键词: basal flow
; flow modeling
; ice flow
; ice stream
; nonlinearity
; ocean tide
; sliding
; Stokes formula
; stress analysis
; tidal cycle
; viscoelasticity
英文摘要: The tidal forcing of ice streams at their ocean boundary can serve as a natural experiment to gain an insight into their dynamics and constrain the basal sliding law. A nonlinear 3-D viscoelastic full Stokes model of coupled ice stream ice shelf flow is used to investigate the response of ice streams to ocean tides. In agreement with previous results based on flow-line modelling and with a fixed grounding line position, we find that a nonlinear basal sliding law can qualitatively reproduce long-period modulation of tidal forcing found in field observations. In addition, we show that the inclusion of lateral drag, or allowing the grounding line to migrate over the tidal cycle, does not affect these conclusions. Further analysis of modelled ice stream flow shows a varying stress-coupling length scale of boundary effects upstream of the grounding line. We derive a viscoelastic stress-coupling length scale from ice stream equations that depends on the forcing period and closely agrees with model output. © 2014 Author(s). Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/74787
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: School of Ocean Sciences, Bangor University, Menai Bridge, United Kingdom; British Antarctic Survey, High Cross, Madingley Rd., Cambridge, United Kingdom
Recommended Citation:
Rosier S,H,R,et al. Insights into ice stream dynamics through modelling their response to tidal forcing[J]. Cryosphere,2014-01-01,8(5)