气候变化领域集成服务门户(CCPortal): Calving relation for tidewater glaciers based on detailed stress field analysis

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DOI	10.5194/tc-12-721-2018
	Calving relation for tidewater glaciers based on detailed stress field analysis
	Mercenier R.; Lüthi M.P.; Vieli A.
发表日期	2018
ISSN	19940416
卷号	12 期号:2
英文摘要	Ocean-terminating glaciers in Arctic regions have undergone rapid dynamic changes in recent years, which have been related to a dramatic increase in calving rates. Iceberg calving is a dynamical process strongly influenced by the geometry at the terminus of tidewater glaciers. We investigate the effect of varying water level, calving front slope and basal sliding on the state of stress and flow regime for an idealized grounded ocean-terminating glacier and scale these results with ice thickness and velocity. Results show that water depth and calving front slope strongly affect the stress state while the effect from spatially uniform variations in basal sliding is much smaller. An increased relative water level or a reclining calving front slope strongly decrease the stresses and velocities in the vicinity of the terminus and hence have a stabilizing effect on the calving front. We find that surface stress magnitude and distribution for simple geometries are determined solely by the water depth relative to ice thickness. Based on this scaled relationship for the stress peak at the surface, and assuming a critical stress for damage initiation, we propose a simple and new parametrization for calving rates for grounded tidewater glaciers that is calibrated with observations. © Author(s) 2018. This work is distributed under the Creative Commons Attribution 4.0 License.
学科领域	calibration; glacier dynamics; ice thickness; iceberg calving; parameterization; tidewater glacier; water depth; water level
语种	英语
scopus关键词	calibration; glacier dynamics; ice thickness; iceberg calving; parameterization; tidewater glacier; water depth; water level
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/119210
作者单位	Department of Geography, University of Zurich, Zurich, Switzerland
推荐引用方式 GB/T 7714	Mercenier R.,Lüthi M.P.,Vieli A.. Calving relation for tidewater glaciers based on detailed stress field analysis[J],2018,12(2).
APA	Mercenier R.,Lüthi M.P.,&Vieli A..(2018).Calving relation for tidewater glaciers based on detailed stress field analysis.Cryosphere,12(2).
MLA	Mercenier R.,et al."Calving relation for tidewater glaciers based on detailed stress field analysis".Cryosphere 12.2(2018).