气候变化领域集成服务门户(CCPortal): Steep Glacier Bed Knickpoints Mitigate Inland Thinning in Greenland

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DOI	10.1029/2020GL090112
	Steep Glacier Bed Knickpoints Mitigate Inland Thinning in Greenland
	Felikson D.; A. Catania G.; Bartholomaus T.C.; Morlighem M.; Noël B.P.Y.
发表日期	2021
ISSN	0094-8276
卷号	48 期号:2
英文摘要	Greenland’s outlet glaciers have been a leading source of mass loss and accompanying sea-level rise from the Greenland Ice Sheet (GrIS) over the last 25 years. The dynamic component of outlet glacier mass loss depends on both the ice flux through the terminus and the inland extent of glacier thinning, initiated at the ice-ocean interface. Here, we find limits to the inland spread of thinning that initiates at glacier termini for 141 ocean-terminating outlet glaciers around the GrIS. Inland diffusion of thinning is limited by steep reaches of bed topography that we call “knickpoints.” We show that knickpoints exist beneath the majority of outlet glaciers but they are less steep in regions of gentle bed topography, giving glaciers in gentle bed topography the potential to contribute to ongoing and future mass loss from the GrIS by allowing the diffusion of thinning far into the ice sheet interior. © 2020. The Authors.
英文关键词	Glaciers; Sea level; Topography; Bed topography; Dynamic component; Greenland; Greenland Ice Sheet; Ice sheet; Mass loss; Sea level rise; Ice
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/169212
作者单位	Cryospheric Sciences Laboratory, NASA Goddard Space Flight Center, Greenbelt, MD, United States; Goddard Earth Sciences Technology and Research Studies and Investigations, Universities Space Research Association, Columbia, MD, United States; University of Texas Institute for Geophysics, University of Texas at Austin, Austin, TX, United States; Department of Geological Sciences, University of Texas at Austin, Austin, TX, United States; Department of Geological Sciences, University of Idaho, Moscow, ID, United States; Department of Earth System Science, University of California, Irvine, Irvine, CA, United States; Institute for Marine and Atmospheric Research Utrecht, Utrecht University, Utrecht, Netherlands
推荐引用方式 GB/T 7714	Felikson D.,A. Catania G.,Bartholomaus T.C.,et al. Steep Glacier Bed Knickpoints Mitigate Inland Thinning in Greenland[J],2021,48(2).
APA	Felikson D.,A. Catania G.,Bartholomaus T.C.,Morlighem M.,&Noël B.P.Y..(2021).Steep Glacier Bed Knickpoints Mitigate Inland Thinning in Greenland.Geophysical Research Letters,48(2).
MLA	Felikson D.,et al."Steep Glacier Bed Knickpoints Mitigate Inland Thinning in Greenland".Geophysical Research Letters 48.2(2021).