气候变化领域集成服务门户(CCPortal): Modelling calving front dynamics using a level-set method: Application to Jakobshavn Isbræ, West Greenland

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DOI	10.5194/tc-10-497-2016
	Modelling calving front dynamics using a level-set method: Application to Jakobshavn Isbræ, West Greenland
	Bondzio J.H.; Seroussi H.; Morlighem M.; Kleiner T.; Rückamp M.; Humbert A.; Larour E.Y.
发表日期	2016
ISSN	19940416
卷号	10 期号:2
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.
学科领域	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
语种	英语
scopus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
来源期刊	Cryosphere
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/119694
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
推荐引用方式 GB/T 7714	Bondzio J.H.,Seroussi H.,Morlighem M.,et al. Modelling calving front dynamics using a level-set method: Application to Jakobshavn Isbræ, West Greenland[J],2016,10(2).
APA	Bondzio J.H..,Seroussi H..,Morlighem M..,Kleiner T..,Rückamp M..,...&Larour E.Y..(2016).Modelling calving front dynamics using a level-set method: Application to Jakobshavn Isbræ, West Greenland.Cryosphere,10(2).
MLA	Bondzio J.H.,et al."Modelling calving front dynamics using a level-set method: Application to Jakobshavn Isbræ, West Greenland".Cryosphere 10.2(2016).