气候变化领域集成服务门户(CCPortal): Ice shelf fracture parameterization in an ice sheet model

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DOI	10.5194/tc-11-2543-2017
	Ice shelf fracture parameterization in an ice sheet model
	Sun S.; Cornford S.L.; Moore J.C.; Gladstone R.; Zhao L.
发表日期	2017
ISSN	19940416
卷号	11 期号:6
英文摘要	Floating ice shelves exert a stabilizing force onto the inland ice sheet. However, this buttressing effect is diminished by the fracture process, which on large scales effectively softens the ice, accelerating its flow, increasing calving, and potentially leading to ice shelf breakup. We add a continuum damage model (CDM) to the BISICLES ice sheet model, which is intended to model the localized opening of crevasses under stress, the transport of those crevasses through the ice sheet, and the coupling between crevasse depth and the ice flow field and to carry out idealized numerical experiments examining the broad impact on large-scale ice sheet and shelf dynamics. In each case we see a complex pattern of damage evolve over time, with an eventual loss of buttressing approximately equivalent to halving the thickness of the ice shelf. We find that it is possible to achieve a similar ice flow pattern using a simple rule of thumb: introducing an enhancement factor ∼10 everywhere in the model domain. However, spatially varying damage (or equivalently, enhancement factor) fields set at the start of prognostic calculations to match velocity observations, as is widely done in ice sheet simulations, ought to evolve in time, or grounding line retreat can be slowed by an order of magnitude. © 2017 Author(s).
学科领域	crevasse; experimental study; grounding line; hydrological modeling; ice flow; ice sheet; ice shelf; iceberg calving; parameterization
语种	英语
scopus关键词	crevasse; experimental study; grounding line; hydrological modeling; ice flow; ice sheet; ice shelf; iceberg calving; parameterization
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/119312
作者单位	Laboratoire de Glaciologie, Université Libre de Bruxelles, Brussels, Belgium; Department of Geography, College of Science, Swansea University, Singleton Park, Swansea, SA2 8PP, United Kingdom; Arctic Centre, University of Lapland, Rovaniemi, 96101, Finland; College of Global Change and Earth System Science, Beijing Normal University, Beijing, 100082, China
推荐引用方式 GB/T 7714	Sun S.,Cornford S.L.,Moore J.C.,et al. Ice shelf fracture parameterization in an ice sheet model[J],2017,11(6).
APA	Sun S.,Cornford S.L.,Moore J.C.,Gladstone R.,&Zhao L..(2017).Ice shelf fracture parameterization in an ice sheet model.Cryosphere,11(6).
MLA	Sun S.,et al."Ice shelf fracture parameterization in an ice sheet model".Cryosphere 11.6(2017).