气候变化领域集成服务门户(CCPortal): Dynamic changes in outlet glaciers in northern Greenland from 1948 to 2015

CCPortal

DOI	10.5194/tc-12-3243-2018
	Dynamic changes in outlet glaciers in northern Greenland from 1948 to 2015
	Hill E.A.; Rachel Carr J.; Stokes C.R.; Hilmar Gudmundsson G.
发表日期	2018
ISSN	19940416
卷号	12 期号:10
英文摘要	The Greenland Ice Sheet (GrIS) is losing mass in response to recent climatic and oceanic warming. Since the mid-1990s, tidewater outlet glaciers across the ice sheet have thinned, retreated, and accelerated, but recent changes in northern Greenland have been comparatively understudied. Consequently, the dynamic response (i.e. changes in surface elevation and velocity) of these outlet glaciers to changes at their termini, particularly calving from floating ice tongues, is poorly constrained. Here we use satellite imagery and historical maps to produce an unprecedented 68-year record of terminus change across 18 major outlet glaciers and combine this with previously published surface elevation and velocity datasets. Overall, recent (1995-2015) retreat rates were higher than at any time in the previous 47 years (since 1948). Despite increased retreat rates from the 1990s, there was distinct variability in dynamic glacier behaviour depending on whether the terminus was grounded or floating. Grounded glaciers accelerated and thinned in response to retreat over the last 2 decades, while most glaciers terminating in ice tongues appeared dynamically insensitive to recent ice tongue retreat and/or total collapse. We also identify glacier geometry (e.g. fjord width, basal topography, and ice tongue confinement) as an important influence on the dynamic adjustment of glaciers to changes at their termini. Recent grounded outlet glacier retreat and ice tongue loss across northern Greenland suggest that the region is undergoing rapid change and could soon contribute substantially to sea level rise via the loss of grounded ice. © 2018 Copernicus GmbH. All rights reserved.
语种	英语
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/119053
作者单位	School of Geography, Politics, and Sociology, Newcastle University, Newcastle-upon-Tyne, NE1 7RU, United Kingdom; Department of Geography, Durham University, Durham, DH1 3LE, United Kingdom; Department of Geography and Environmental Sciences, Northumbria University, Newcastle-upon-Tyne, NE1 8ST, United Kingdom
推荐引用方式 GB/T 7714	Hill E.A.,Rachel Carr J.,Stokes C.R.,et al. Dynamic changes in outlet glaciers in northern Greenland from 1948 to 2015[J],2018,12(10).
APA	Hill E.A.,Rachel Carr J.,Stokes C.R.,&Hilmar Gudmundsson G..(2018).Dynamic changes in outlet glaciers in northern Greenland from 1948 to 2015.Cryosphere,12(10).
MLA	Hill E.A.,et al."Dynamic changes in outlet glaciers in northern Greenland from 1948 to 2015".Cryosphere 12.10(2018).