globalchange  > 气候变化事实与影响
DOI: 10.1175/JCLI-D-12-00513.1
Scopus记录号: 2-s2.0-84880320184
论文题名:
Ice volume and subglacial topography for western Canadian glaciers from mass balance fields, thinning rates, and a bed stress model
作者: Clarke G.K.C.; Anslow F.S.; Jarosch A.H.; Radić V.; Menounos B.; Bolch T.; Berthier E.
刊名: Journal of Climate
ISSN: 8948755
出版年: 2013
卷: 26, 期:12
起始页码: 4282
结束页码: 4303
语种: 英语
Scopus关键词: Glaciation ; Ice thickness ; Inverse methods ; Linear optimization problems ; Mass-balance calculations ; North America ; Sea level rise ; Surface mass balance ; Climate change ; Estimation ; Glacial geology ; Glaciers ; Inverse problems ; Numerical methods ; Sea level ; Ice ; climate change ; climate effect ; glaciation ; glacier dynamics ; ice thickness ; inverse analysis ; mass balance ; numerical model ; optimization ; subglacial environment ; topography ; Canada
英文摘要: A method is described to estimate the thickness of glacier ice using information derived from the measured ice extent, surface topography, surface mass balance, and rate of thinning or thickening of the ice column. Shear stress beneath an ice column is assumed to be simply related to ice thickness and surface slope, as for an inclined slab, but this calculation is cast as a linear optimization problem so that a smoothness regularization can be applied. Assignment of bed stress is based on the flow law for ice and a mass balance calculation but must be preceded by delineation of the ice flow drainage basin. Validation of the method is accomplished by comparing thickness estimates to the known thickness generated by a numerical ice dynamics model. Once validated, the method is used to estimate the subglacial topography for all glaciers in western Canada that lie south of 60°N. Adding the present ice volume of each glacier gives the estimated total volume as 2320 km3, equivalent to 5.8 mm of sea level rise. Taking the glaciated area as 26 590 km2 gives the average glacier thickness as 87.2 m. A detailed error analysis indicates that systematic errors are likely to increase the estimated sea level rise and when random errors are included the combined result is 6.3±0.6 mm or, expressed as ice volume, 2530 ± 220 km3. © 2013 American Meteorological Society.
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/51841
Appears in Collections:气候变化事实与影响

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作者单位: Department of Earth, Ocean and Atmospheric Sciences, University of British Columbia, Vancouver, BC, Canada; Pacific Climate Impacts Consortium, University of Victoria, Victoria, BC, Canada; Centre for Climate and Cryosphere, University of Innsbruck, Innsbruck, Austria; Natural Resources and Environmental Studies Institute, University of Northern British Columbia, Prince George, BC, Canada; Department of Geography, University of Zurich, Zurich, Switzerland; Institut für Kartographie, Technische Universität Dresden, Dresden, Germany; Université de Toulouse-OMP/LEGOS, Centre National de la Recherche Scientifique-LEGOS, Toulouse, France

Recommended Citation:
Clarke G.K.C.,Anslow F.S.,Jarosch A.H.,et al. Ice volume and subglacial topography for western Canadian glaciers from mass balance fields, thinning rates, and a bed stress model[J]. Journal of Climate,2013-01-01,26(12)
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