globalchange  > 影响、适应和脆弱性
DOI: 10.5194/tc-8-1497-2014
Scopus记录号: 2-s2.0-84924850944
论文题名:
Glacier dynamics at Helheim and Kangerdlugssuaq glaciers, southeast Greenland, since the Little Ice Age
作者: 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
刊名: Cryosphere
ISSN: 19940416
出版年: 2014
卷: 8, 期:4
起始页码: 1497
结束页码: 1507
语种: 英语
英文关键词: 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
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.
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/74805
Appears in Collections:影响、适应和脆弱性
气候变化与战略

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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

Recommended Citation:
Khan S,A,, Kjeldsen K,et al. Glacier dynamics at Helheim and Kangerdlugssuaq glaciers, southeast Greenland, since the Little Ice Age[J]. Cryosphere,2014-01-01,8(4)
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