气候变化领域集成服务门户(CCPortal): Physical processes controlling the rifting of Larsen C Ice Shelf, Antarctica, prior to the calving of iceberg A68

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DOI	10.1073/pnas.2105080118
	Physical processes controlling the rifting of Larsen C Ice Shelf, Antarctica, prior to the calving of iceberg A68
	Larour E.; Rignot E.; Poinelli M.; Scheuchl B.
发表日期	2021
ISSN	0027-8424
卷号	118 期号:40
英文摘要	The sudden propagation of a major preexisting rift (full-thickness crack) in late 2016 on the Larsen C Ice Shelf, Antarctica led to the calving of tabular iceberg A68 in July 2017, one of the largest icebergs on record, posing a threat for the stability of the remaining ice shelf. As with other ice shelves, the physical processes that led to the activation of the A68 rift and controlled its propagation have not been elucidated. Here, we model the response of the ice shelf stress balance to ice shelf thinning and thinning of the ice mélange encased in and around preexisting rifts. We find that ice shelf thinning does not reactivate the rifts, but heals them. In contrast, thinning of the mélange controls the opening rate of the rift, with an above-linear dependence on thinning. The simulations indicate that thinning of the ice mélange by 10 to 20 m is sufficient to reactivate the rifts and trigger a major calving event, thereby establishing a link between climate forcing and ice shelf retreat that has not been included in ice sheet models. Rift activation could initiate ice shelf retreat decades prior to hydrofracture caused by water ponding at the ice shelf surface. © 2021 National Academy of Sciences. All rights reserved.
英文关键词	Antarctica; Fracture; Ice shelf; Larsen C; Sea level
语种	英语
scopus关键词	Antarctica; Article; climate change; environmental impact; ice shelf; iceberg; interferometry; mathematical model; physical phenomena
来源期刊	Proceedings of the National Academy of Sciences of the United States of America
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/238627
作者单位	Jet Propulsion Laboratory, California Institute of Technology, Pasadena, CA 91109, United States; Department of Earth System Science, University of California, Irvine, CA 92697, United States; Department of Geoscience and Remote Sensing, Delft University of Technology, Delft, 2628 CN, Netherlands
推荐引用方式 GB/T 7714	Larour E.,Rignot E.,Poinelli M.,et al. Physical processes controlling the rifting of Larsen C Ice Shelf, Antarctica, prior to the calving of iceberg A68[J],2021,118(40).
APA	Larour E.,Rignot E.,Poinelli M.,&Scheuchl B..(2021).Physical processes controlling the rifting of Larsen C Ice Shelf, Antarctica, prior to the calving of iceberg A68.Proceedings of the National Academy of Sciences of the United States of America,118(40).
MLA	Larour E.,et al."Physical processes controlling the rifting of Larsen C Ice Shelf, Antarctica, prior to the calving of iceberg A68".Proceedings of the National Academy of Sciences of the United States of America 118.40(2021).