globalchange  > 气候变化与战略
DOI: 10.1073/pnas.1212647110
论文题名:
Enhanced basal lubrication and the contribution of the Greenland ice sheet to future sea-level rise
作者: Shannon S.R.; Payne A.J.; Bartholomew I.D.; Van Den Broeke M.R.; Edwards T.L.; Fettweis X.; Gagliardini O.; Gillet-Chaulet F.; Goelzer H.; Hoffman M.J.; Huybrechts P.; Mair D.W.F.; Nienow P.W.; Perego M.; Price S.F.; Paul Smeets C.J.P.; Sole A.J.; Van De Wal R.S.W.; Zwinger T.
刊名: Proceedings of the National Academy of Sciences of the United States of America
ISSN: 0027-8424
出版年: 2013
卷: 110, 期:35
起始页码: 14156
结束页码: 14161
语种: 英语
Scopus关键词: runoff ; article ; comparative study ; controlled study ; environmental parameters ; experimental model ; flow kinetics ; global climate ; Greenland ; ice sheet ; lubrication ; mass ; priority journal ; sea level rise ; surface property
英文摘要: We assess the effect of enhanced basal sliding on the flow and mass budget of the Greenland ice sheet, using a newly developed parameterization of the relation between meltwater runoff and ice flow. A wide range of observations suggest that water generated by melt at the surface of the ice sheet reaches its bed by both fracture and drainage through moulins. Once at the bed, this water is likely to affect lubrication, although current observations are insufficient to determine whether changes in subglacial hydraulics will limit the potential for the speedup of flow. An uncertainty analysis based on our best-fit parameterization admits both possibilities: continuously increasing or bounded lubrication. We apply the parameterization to four higher-order ice-sheet models in a series of experiments forced by changes in both lubrication and surface mass budget and determine the additional mass loss brought about by lubrication in comparison with experiments forced only by changes in surface mass balance. We use forcing from a regional climate model, itself forced by output from the European Centre Hamburg Model (ECHAM5) global climate model run under scenario A1B. Although changes in lubrication generate widespread effects on the flow and form of the ice sheet, they do not affect substantial net mass loss; increase in the ice sheet's contribution to sea-level rise from basal lubrication is projected by all models to be no more than 5% of the contribution from surface mass budget forcing alone.
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/162392
Appears in Collections:气候变化与战略

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作者单位: Shannon, S.R., Department of Geographical Science, University of Bristol, Bristol BS8 1SS, United Kingdom; Payne, A.J., Department of Geographical Science, University of Bristol, Bristol BS8 1SS, United Kingdom; Bartholomew, I.D., School of Geosciences, University of Edinburgh, Edinburgh EH8 9XP, United Kingdom; Van Den Broeke, M.R., Institute for Marine, Atmospheric Research Utrecht, Utrecht University, 3508, TA Utrecht, Netherlands; Edwards, T.L., Department of Geographical Science, University of Bristol, Bristol BS8 1SS, United Kingdom; Fettweis, X., Department of Geography 2, University of Liège, Bat. B11, 4000 Liège, Belgium; Gagliardini, O., Laboratoire de Glaciologie et Géophysique de l'Environnement, Université Joseph Fourier-Grenoble, UMR 5183, Saint-Martin-d'Hères, France, Institut Universitaire de France, 75005 Paris, France; Gillet-Chaulet, F., Laboratoire de Glaciologie et Géophysique de l'Environnement, Université Joseph Fourier-Grenoble, UMR 5183, Saint-Martin-d'Hères, France; Goelzer, H., Earth System Sciences and Departement Geografie, Vrije Universiteit Brussel, 1050 Brussels, Belgium; Hoffman, M.J., Fluid Dynamics and Solid Mechanics Group, Theoretical Division, Los Alamos National Laboratory, Los Alamos, NM 87545, United States; Huybrechts, P., Earth System Sciences and Departement Geografie, Vrije Universiteit Brussel, 1050 Brussels, Belgium; Mair, D.W.F., Department of Geography and Environment, School of Geosciences, University of Aberdeen, Aberdeen AB24 3UF, United Kingdom; Nienow, P.W., School of Geosciences, University of Edinburgh, Edinburgh EH8 9XP, United Kingdom; Perego, M., Department of Scientific Computing, Florida State University, Tallahassee, FL 32306, United States; Price, S.F., Fluid Dynamics and Solid Mechanics Group, Theoretical Division, Los Alamos National Laboratory, Los Alamos, NM 87545, United States; Paul Smeets, C.J.P., Institute for Marine, Atmospheric Research Utrecht, Utrecht University, 3508, TA Utrecht, Netherlands; Sole, A.J., Department of Geography, University of Sheffield, Sheffield S10 2TN, United Kingdom; Van De Wal, R.S.W., Institute for Marine, Atmospheric Research Utrecht, Utrecht University, 3508, TA Utrecht, Netherlands; Zwinger, T., Center for Scientific Computing - Information Technology, Center for Science Ltd., FI-02101, Espoo, Finland

Recommended Citation:
Shannon S.R.,Payne A.J.,Bartholomew I.D.,et al. Enhanced basal lubrication and the contribution of the Greenland ice sheet to future sea-level rise[J]. Proceedings of the National Academy of Sciences of the United States of America,2013-01-01,110(35)
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