气候变化领域集成服务门户(CCPortal): Satellite-derived submarine melt rates and mass balance (2011-2015) for Greenland's largest remaining ice tongues

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DOI	10.5194/tc-11-2773-2017
	Satellite-derived submarine melt rates and mass balance (2011-2015) for Greenland's largest remaining ice tongues
	Wilson N.; Straneo F.; Heimbach P.
发表日期	2017
ISSN	19940416
卷号	11 期号:6
英文摘要	Ice-shelf-like floating extensions at the termini of Greenland glaciers are undergoing rapid changes with potential implications for the stability of upstream glaciers and the ice sheet as a whole. While submarine melting is recognized as a major contributor to mass loss, the spatial distribution of submarine melting and its contribution to the total mass balance of these floating extensions is incompletely known and understood. Here, we use high-resolution WorldView satellite imagery collected between 2011 and 2015 to infer the magnitude and spatial variability of melt rates under Greenland's largest remaining ice tongues - Nioghalvfjerdsbræ (79 North Glacier, 79N), Ryder Glacier (RG), and Petermann Glacier (PG). Submarine melt rates under the ice tongues vary considerably, exceeding 50m a-1 near the grounding zone and decaying rapidly downstream. Channels, likely originating from upstream subglacial channels, give rise to large melt variations across the ice tongues. We compare the total melt rates to the influx of ice to the ice tongue to assess their contribution to the current mass balance. At Petermann Glacier and Ryder Glacier, we find that the combined submarine and aerial melt approximately balances the ice flux from the grounded ice sheet. At Nioghalvfjerdsbræ the total melt flux (14.2±0.96km3 a-1w.e., water equivalent) exceeds the inflow of ice (10.2±0.59km3 a-1w.e.), indicating present thinning of the ice tongue.
学科领域	glacier mass balance; ice sheet; ice shelf; satellite imagery; spatial distribution; spatial variation; subglacial environment; underwater environment; WorldView; Arctic; Greenland; Greenland Ice Sheet; Petermann Glacier
语种	英语
scopus关键词	glacier mass balance; ice sheet; ice shelf; satellite imagery; spatial distribution; spatial variation; subglacial environment; underwater environment; WorldView; Arctic; Greenland; Greenland Ice Sheet; Petermann Glacier
来源期刊	Cryosphere
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/119301
作者单位	MIT-WHOI Joint Program in Oceanography/Applied Ocean Science and Engineering, Cambridge, MA, United States; Geology and Geophysics Department, Woods Hole Oceanographic Institution, Woods Hole, MA, United States; Physical Oceanography Department, Woods Hole Oceanographic Institution, Woods Hole, MA, United States; Jackson School of Geosciences, Institute for Computational Engineering and Sciences, University of Texas at Austin, Austin, TX, United States; Scripps Institution of Oceanography, UCSD, San Diego, CA, United States
推荐引用方式 GB/T 7714	Wilson N.,Straneo F.,Heimbach P.. Satellite-derived submarine melt rates and mass balance (2011-2015) for Greenland's largest remaining ice tongues[J],2017,11(6).
APA	Wilson N.,Straneo F.,&Heimbach P..(2017).Satellite-derived submarine melt rates and mass balance (2011-2015) for Greenland's largest remaining ice tongues.Cryosphere,11(6).
MLA	Wilson N.,et al."Satellite-derived submarine melt rates and mass balance (2011-2015) for Greenland's largest remaining ice tongues".Cryosphere 11.6(2017).