DOI: 10.5194/tc-10-497-2016
Scopus记录号: 2-s2.0-84960114236
论文题名: Modelling calving front dynamics using a level-set method: Application to Jakobshavn Isbræ, West Greenland
作者: Bondzio J ; H ; , Seroussi H ; , Morlighem M ; , Kleiner T ; , Rückamp M ; , Humbert A ; , Larour E ; Y
刊名: Cryosphere
ISSN: 19940416
出版年: 2016
卷: 10, 期: 2 起始页码: 497
结束页码: 510
语种: 英语
英文关键词: acceleration
; boundary
; drainage basin
; dynamic response
; front
; glacier dynamics
; hydrological modeling
; ice sheet
; ice stream
; iceberg calving
; numerical model
; sea level change
; tracking
; Arctic
; Greenland
; Greenland Ice Sheet
; Jakobshavn Glacier
; West Greenland
英文摘要: Calving is a major mechanism of ice discharge of the Antarctic and Greenland ice sheets, and a change in calving front position affects the entire stress regime of marine terminating glaciers. The representation of calving front dynamics in a 2-D or 3-D ice sheet model remains non-trivial. Here, we present the theoretical and technical framework for a level-set method, an implicit boundary tracking scheme, which we implement into the Ice Sheet System Model (ISSM). This scheme allows us to study the dynamic response of a drainage basin to user-defined calving rates. We apply the method to Jakobshavn Isbræ, a major marine terminating outlet glacier of the West Greenland Ice Sheet. The model robustly reproduces the high sensitivity of the glacier to calving, and we find that enhanced calving triggers significant acceleration of the ice stream. Upstream acceleration is sustained through a combination of mechanisms. However, both lateral stress and ice influx stabilize the ice stream. This study provides new insights into the ongoing changes occurring at Jakobshavn Isbræ and emphasizes that the incorporation of moving boundaries and dynamic lateral effects, not captured in flow-line models, is key for realistic model projections of sea level rise on centennial timescales. © Author(s) 2016. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/75178
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: Alfred Wegener Institute, Helmholtz Centre for Polar and Marine Research, Bremerhaven, Germany; Jet Propulsion Laboratory, California Institute of Technology, Pasadena, CA, United States; Department of Earth System Science, University of California Irvine, Irvine, CA, United States; Faculty 05: Geosciences, University of Bremen, Bremen, Germany
Recommended Citation:
Bondzio J,H,, Seroussi H,et al. Modelling calving front dynamics using a level-set method: Application to Jakobshavn Isbræ, West Greenland[J]. Cryosphere,2016-01-01,10(2)