气候变化领域集成服务门户(CCPortal): Glacier dynamics at Helheim and Kangerdlugssuaq glaciers, southeast Greenland, since the Little Ice Age

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DOI	10.5194/tc-8-1497-2014
	Glacier dynamics at Helheim and Kangerdlugssuaq glaciers, southeast Greenland, since the Little Ice Age
	Khan S.A.; Kjeldsen K.K.; Kjær K.H.; Bevan S.; Luckman A.; Bjørk A.A.; Korsgaard N.J.; Box J.E.; Van Den Broeke M.; Van Dam T.M.; Fitzner A.
发表日期	2014
ISSN	19940416
卷号	8 期号:4
英文摘要	Observations over the past decade show significant ice loss associated with the speed-up of glaciers in southeast Greenland from 2003, followed by a deceleration from 2006. These short-term, episodic, dynamic perturbations have a major impact on the mass balance on the decadal scale. To improve the projection of future sea level rise, a long-term data record that reveals the mass balance beyond such episodic events is required. Here, we extend the observational record of marginal thinning of Helheim and Kangerdlugssuaq glaciers from 10 to more than 80 years.We show that, although the frontal portion of Helheim Glacier thinned by more than 100m between 2003 and 2006, it thickened by more than 50m during the previous two decades. In contrast, Kangerdlugssuaq Glacier underwent minor thinning of 40-50m from 1981 to 1998 and major thinning of more than 100m after 2003. Extending the record back to the end of the Little Ice Age (prior to 1930) shows no thinning of Helheim Glacier from its maximum extent during the Little Ice Age to 1981, while Kangerdlugssuaq Glacier underwent substantial thinning of 230 to 265 m. Comparison of sub-surface water temperature anomalies and variations in air temperature to records of thickness and velocity change suggest that both glaciers are highly sensitive to short-term atmospheric and ocean forcing, and respond very quickly to small fluctuations. On century timescales, however, multiple external parameters (e.g. outlet glacier shape) may dominate the mass change. These findings suggest that special care must be taken in the projection of future dynamic ice loss. © Author(s) 2014.
学科领域	air temperature; glacier flow; Little Ice Age; mass balance; parameterization; timescale; water temperature; episodic event; glacier dynamics; glacier mass balance; perturbation; sea level change; spatiotemporal analysis; velocity profile; Arctic; Greenland; Kangerlussuaq Fjord; Helheim Glacier
语种	英语
scopus关键词	air temperature; glacier flow; Little Ice Age; mass balance; parameterization; timescale; water temperature; episodic event; glacier dynamics; glacier mass balance; perturbation; sea level change; spatiotemporal analysis; velocity profile; Arctic; Greenland; Kangerlussuaq Fjord; Helheim 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/120070
作者单位	DTU Space - National Space Institute, Technical University of Denmark, Department of Geodesy, Kgs. Lyngby, Denmark; Centre for GeoGenetics, Natural History Museum, University of Copenhagen, Copenhagen, Denmark; Department of Geography, College of Science, Swansea University, Swansea, United Kingdom; Geophysical Institute, University of Alaska, Fairbanks, United States; Geological Survey of Denmark and Greenland, Copenhagen, Denmark; Institute for Marine and Atmospheric Research, Utrecht University, Utrecht, Netherlands; Faculté des Sciences, de la Technologie et de la Communication, University of Luxembourg, Luxembourg; Centre for Ice and Climate, University of Copenhagen, Copenhagen, Denmark
推荐引用方式 GB/T 7714	Khan S.A.,Kjeldsen K.K.,Kjær K.H.,et al. Glacier dynamics at Helheim and Kangerdlugssuaq glaciers, southeast Greenland, since the Little Ice Age[J],2014,8(4).
APA	Khan S.A..,Kjeldsen K.K..,Kjær K.H..,Bevan S..,Luckman A..,...&Fitzner A..(2014).Glacier dynamics at Helheim and Kangerdlugssuaq glaciers, southeast Greenland, since the Little Ice Age.Cryosphere,8(4).
MLA	Khan S.A.,et al."Glacier dynamics at Helheim and Kangerdlugssuaq glaciers, southeast Greenland, since the Little Ice Age".Cryosphere 8.4(2014).