气候变化领域集成服务门户(CCPortal): Calving on tidewater glaciers amplified by submarine frontal melting

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DOI	10.5194/tc-7-119-2013
	Calving on tidewater glaciers amplified by submarine frontal melting
	O'Leary M.; Christoffersen P.
发表日期	2013
ISSN	19940416
卷号	7 期号:1
英文摘要	While it has been shown repeatedly that ocean conditions exhibit an important control on the behaviour of grounded tidewater glaciers, modelling studies have focused largely on the effects of basal and surface melting. Here, a finite-element model of stresses near the front of a tidewater glacier is used to investigate the effects of frontal melting on calving, independently of the calving criterion used. Applications of the stress model to idealized scenarios reveal that undercutting of the ice front due to frontal melting can drive calving at up to ten times the mean melt rate. Factors which cause increased frontal melt-driven calving include a strong thermal gradient in the ice, and a concentration of frontal melt at the base of the glacier. These properties are typical of both Arctic and Antarctic tidewater glaciers. The finding that frontal melt near the base is a strong driver of calving leads to the conclusion that water temperatures near the bed of the glacier are critically important to the glacier front, and thus the flow of the glacier. These conclusions are robust against changes in the basal boundary condition and the choice of calving criterion, as well as variations in the glacier size or level of crevassing. © Author(s) 2013.
学科领域	boundary condition; crevasse; finite element method; iceberg calving; melting; numerical model; temperature gradient; tidewater glacier; underwater environment; water temperature
语种	英语
scopus关键词	boundary condition; crevasse; finite element method; iceberg calving; melting; numerical model; temperature gradient; tidewater glacier; underwater environment; water temperature
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/120319
作者单位	Scott Polar Research Institute, University of Cambridge, Cambridge, United Kingdom; Department of Atmospheric, Oceanic and Space Sciences, University of Michigan, Ann Arbor, MI, United States
推荐引用方式 GB/T 7714	O'Leary M.,Christoffersen P.. Calving on tidewater glaciers amplified by submarine frontal melting[J],2013,7(1).
APA	O'Leary M.,&Christoffersen P..(2013).Calving on tidewater glaciers amplified by submarine frontal melting.Cryosphere,7(1).
MLA	O'Leary M.,et al."Calving on tidewater glaciers amplified by submarine frontal melting".Cryosphere 7.1(2013).