气候变化领域集成服务门户(CCPortal): Breaking the Ice: Identifying Hydraulically Forced Crevassing

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DOI	10.1029/2020GL090597
	Breaking the Ice: Identifying Hydraulically Forced Crevassing
	Hudson T.S.; Brisbourne A.M.; White R.S.; Kendall J.M.; Arthern R.; Smith A.M.
发表日期	2020
ISSN	0094-8276
卷号	47 期号:21
英文摘要	Hydraulically forced crevassing is thought to reduce the stability of ice shelves and ice sheets, affecting structural integrity and providing pathways for surface meltwater to the bed. It can cause ice shelves to collapse and ice sheets to accelerate into the ocean. However, direct observations of the hydraulically forced crevassing process remain elusive. Here we report a novel method and observations that use icequakes to directly observe crevassing and determine the role of hydrofracture. Crevasse icequake depths from seismic observations are compared to a theoretically derived maximum dry crevasse depth. We observe icequakes below this depth, suggesting hydrofracture. Furthermore, icequake source mechanisms provide insight into the fracture process, with predominantly opening cracks observed, which have opening volumes of hundredths of a cubic meter. Our method and findings provide a framework for studying a critical process that is key for the stability of ice shelves and ice sheets and, therefore, future sea level rise projections. ©2020. The Authors.
英文关键词	Glaciers; Sea level; Direct observations; Fracture process; Hydro-fracture; Opening cracks; Sea level rise; Seismic observation; Source mechanisms; Surface meltwater; Ice; crevasse; ice breakup; ice shelf; ice-ocean interaction; meltwater; sea level change
语种	英语
来源期刊	Geophysical Research Letters
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/169524
作者单位	Department of Earth Sciences, University of Oxford, Oxford, United Kingdom; British Antarctic Survey, Cambridge, United Kingdom; Bullard Laboratories, University of Cambridge, Cambridge, United Kingdom
推荐引用方式 GB/T 7714	Hudson T.S.,Brisbourne A.M.,White R.S.,et al. Breaking the Ice: Identifying Hydraulically Forced Crevassing[J],2020,47(21).
APA	Hudson T.S.,Brisbourne A.M.,White R.S.,Kendall J.M.,Arthern R.,&Smith A.M..(2020).Breaking the Ice: Identifying Hydraulically Forced Crevassing.Geophysical Research Letters,47(21).
MLA	Hudson T.S.,et al."Breaking the Ice: Identifying Hydraulically Forced Crevassing".Geophysical Research Letters 47.21(2020).