气候变化领域集成服务门户(CCPortal): Damage accelerates ice shelf instability and mass loss in Amundsen Sea Embayment

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DOI	10.1073/pnas.1912890117
	Damage accelerates ice shelf instability and mass loss in Amundsen Sea Embayment
	Lhermitte S.; Sun S.; Shuman C.; Wouters B.; Pattyn F.; Wuite J.; Berthier E.; Nagler T.
发表日期	2020
ISSN	0027-8424
起始页码	24735
结束页码	24741
卷号	117 期号:40
英文摘要	Pine Island Glacier and Thwaites Glacier in the Amundsen Sea Embayment are among the fastest changing outlet glaciers in West Antarctica with large consequences for global sea level. Yet, assessing how much and how fast both glaciers will weaken if these changes continue remains a major uncertainty as many of the processes that control their ice shelf weakening and grounding line retreat are not well understood. Here, we combine multisource satellite imagery with modeling to uncover the rapid development of damage areas in the shear zones of Pine Island and Thwaites ice shelves. These damage areas consist of highly crevassed areas and open fractures and are first signs that the shear zones of both ice shelves have structurally weakened over the past decade. Idealized model results reveal moreover that the damage initiates a feedback process where initial ice shelf weakening triggers the development of damage in their shear zones, which results in further speedup, shearing, and weakening, hence promoting additional damage development. This damage feedback potentially preconditions these ice shelves for disintegration and enhances grounding line retreat. The results of this study suggest that damage feedback processes are key to future ice shelf stability, grounding line retreat, and sea level contributions from Antarctica. Moreover, they underline the need for incorporating these feedback processes, which are currently not accounted for in most ice sheet models, to improve sea level rise projections. © 2020 National Academy of Sciences. All rights reserved.
英文关键词	Antarctica; Glaciology; Ice sheet modeling; Remote sensing; Sea level rise
语种	英语
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/158842
作者单位	Lhermitte, S., Department of Geoscience and Remote Sensing, Delft Univeristy of Technology, Delft, 2600GA, Netherlands; Sun, S., Laboratoire de Glaciologie, UniversitéLibre de Bruxelles, Bruxelles, B-1050, Belgium; Shuman, C., University of Maryland, Baltimore County, Joint Center for Earth System Technology, NASA Goddard Space Flight Center, Greenbelt, MD 20771, United States; Wouters, B., Department of Geoscience and Remote Sensing, Delft Univeristy of Technology, Delft, 2600GA, Netherlands, Institute for Marine and Atmospheric Research Utrecht, Utrecht University, Utrecht, 3584 CC, Netherlands; Pattyn, F., Laboratoire de Glaciologie, UniversitéLibre de Bruxelles, Bruxelles, B-1050, Belgium; Wuite, J., ENVEO IT GmbH, Innsbruck, 6020, Austria; Berthier, E., Observatoire Midi-Pyréneés, Laboratoire d'Etudes en Geóphysique et Océanographie Spatiales (OMP/LEGOS), Centre national d'études spatiales (CNES), CNRS, Institut de recherche pour le développement (IRD), UniversitéPaul-Sabatier (UPS), Toulouse, 31000...
推荐引用方式 GB/T 7714	Lhermitte S.,Sun S.,Shuman C.,et al. Damage accelerates ice shelf instability and mass loss in Amundsen Sea Embayment[J],2020,117(40).
APA	Lhermitte S..,Sun S..,Shuman C..,Wouters B..,Pattyn F..,...&Nagler T..(2020).Damage accelerates ice shelf instability and mass loss in Amundsen Sea Embayment.Proceedings of the National Academy of Sciences of the United States of America,117(40).
MLA	Lhermitte S.,et al."Damage accelerates ice shelf instability and mass loss in Amundsen Sea Embayment".Proceedings of the National Academy of Sciences of the United States of America 117.40(2020).