globalchange  > 气候减缓与适应
DOI: 10.1038/ngeo2934
论文题名:
Inland thinning on the Greenland ice sheet controlled by outlet glacier geometry
作者: Felikson D.; Bartholomaus T.C.; Catania G.A.; Korsgaard N.J.; Kjær K.H.; Morlighem M.; Noël B.; Van Den Broeke M.; Stearns L.A.; Shroyer E.L.; Sutherland D.A.; Nash J.D.
刊名: Nature Geoscience
ISSN: 17520894
出版年: 2017
卷: 10, 期:5
起始页码: 366
结束页码: 369
语种: 英语
Scopus关键词: digital elevation model ; geometry ; glacier dynamics ; ice sheet ; sea level change ; threshold ; wave velocity ; Arctic ; Greenland ; Greenland Ice Sheet ; West Greenland
英文摘要: Greenland's contribution to future sea-level rise remains uncertain and a wide range of upper and lower bounds has been proposed. These predictions depend strongly on how mass loss - which is focused at the termini of marine-terminating outlet glaciers - can penetrate inland to the ice-sheet interior. Previous studies have shown that, at regional scales, Greenland ice sheet mass loss is correlated with atmospheric and oceanic warming. However, mass loss within individual outlet glacier catchments exhibits unexplained heterogeneity, hindering our ability to project ice-sheet response to future environmental forcing. Using digital elevation model differencing, we spatially resolve the dynamic portion of surface elevation change from 1985 to present within 16 outlet glacier catchments in West Greenland, where significant heterogeneity in ice loss exists. We show that the up-glacier extent of thinning and, thus, mass loss, is limited by glacier geometry. We find that 94% of the total dynamic loss occurs between the terminus and the location where the down-glacier advective speed of a kinematic wave of thinning is at least three times larger than its diffusive speed. This empirical threshold enables the identification of glaciers that are not currently thinning but are most susceptible to future thinning in the coming decades. © 2017 Macmillan Publishers Limited, part of Springer Nature. All rights reserved.
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/105795
Appears in Collections:气候减缓与适应
科学计划与规划

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作者单位: Institute for Geophysics, University of Texas at Austin, Austin, TX, United States; Department of Aerospace Engineering and Engineering Mechanics, University of Texas at Austin, Austin, TX, United States; Department of Geological Sciences, University of Texas at Austin, Austin, TX, United States; Nordic Volcanological Center, Institute of Earth Sciences, University of Iceland, Reykjavik, Iceland; Centre for GeoGenetics, Natural History Museum, University of Copenhagen, Copenhagen, Denmark; Department of Earth System Science, University of California, Irvine, CA, United States; Institute for Marine and Atmospheric Research Utrecht, Utrecht University, Utrecht, Netherlands; Department of Geology, University of Kansas, Lawrence, KS, United States; College of Earth, Ocean, and Atmospheric Sciences, Oregon State University, Corvallis, OR, United States; Department of Geological Sciences, University of Oregon, Eugene, OR, United States; Department of Geological Sciences, University of Idaho, Moscow, ID, United States

Recommended Citation:
Felikson D.,Bartholomaus T.C.,Catania G.A.,et al. Inland thinning on the Greenland ice sheet controlled by outlet glacier geometry[J]. Nature Geoscience,2017-01-01,10(5)
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