globalchange  > 气候减缓与适应
DOI: 10.1038/ngeo1737
论文题名:
Evolution of the subglacial drainage system beneath the Greenland Ice Sheet revealed by tracers
作者: Chandler D.M.; Wadham J.L.; Lis G.P.; Cowton T.; Sole A.; Bartholomew I.; Telling J.; Nienow P.; Bagshaw E.B.; Mair D.; Vinen S.; Hubbard A.
刊名: Nature Geoscience
ISSN: 17520894
出版年: 2013
卷: 6, 期:3
起始页码: 195
结束页码: 198
语种: 英语
Scopus关键词: climate change ; drainage ; fluoride ; glacial landform ; ice sheet ; lubricant ; measurement method ; meltwater ; routing ; spatial variation ; subglacial environment ; water flow ; Arctic ; Greenland ; Greenland Ice Sheet
英文摘要: Predictions of the Greenland Ice Sheet's response to climate change are limited in part by uncertainty in the coupling between meltwater lubrication of the ice-sheet bed and ice flow1-3. This uncertainty arises largely from a lack of direct measurements of water flow characteristics at the bed of the ice sheet. Previous work has been restricted to indirect observations based on seasonal and spatial variations in surface ice velocities4-7 and on meltwater flux8. Here, we employ rhodamine and sulphur hexafluoride tracers, injected into the drainage system over three melt seasons, to observe subglacial drainage properties and evolution beneath the Greenland Ice Sheet, up to 57 km from the margin. Tracer results indicate evolution from a slow, inefficient drainage system to a fast, efficient channelized drainage system over the course of the melt season. Further inland, evolution to efficient drainage occurs later and more slowly. An efficient routing of water was established up to 41 km or more from the margin, where the ice is approximately 1 km thick. Overall, our findings support previous interpretations of drainage system characteristics, thereby validating the use of surface observations as a means of investigating basal processes. Copyright © 2013 Macmillan Publishers Limited.
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/106850
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: Bristol Glaciology Centre, School of Geographical Sciences, University of Bristol, Bristol BS8 1SS, United Kingdom; Department of Geography, School of Geosciences, University of Edinburgh, Edinburgh EH8 9XP, United Kingdom; Department of Geography, University of Sheffield, Sheffield S10 2TN, United Kingdom; Department of Geography and the Environment, School of Geoscience, University of Aberdeen, Aberdeen AB24 3UF, United Kingdom; School of Environmental Sciences, University of East Anglia, Norwich NR4 7TJ, United Kingdom; Institute of Geography and Earth Science, University of Aberystwyth, Aberystwyth SY23 3DB, United Kingdom

Recommended Citation:
Chandler D.M.,Wadham J.L.,Lis G.P.,et al. Evolution of the subglacial drainage system beneath the Greenland Ice Sheet revealed by tracers[J]. Nature Geoscience,2013-01-01,6(3)
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