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Article
Effect of a cold margin on ice flow at the terminus of Storglacïaren, Sweden: implications for sediment transport
Journal of Glaciology
  • Peter Lindsay Moore, Iowa State University
  • Neal R. Iverson, Iowa State University
  • Keith A. Brugger, University of Minnesota - Morris
  • Denis Cohen, Iowa State University
  • Thomas S. Hooyer, University of Wisconsin - Milwaukee
  • Peter Jansson, Stockholm University
Document Type
Article
Publication Version
Published Version
Publication Date
2-1-2011
DOI
10.3189/002214311795306583
Abstract

The cold-based termini of polythermal glaciers are usually assumed to adhere strongly to an immobile substrate and thereby supply significant resistance to the flow of warm-based ice upglacier. This compressive environment is commonly thought to uplift basal sediment to the surface of the glacier by folding and thrust faulting. We present model and field evidence from the terminus of Storglacïaren, Sweden, showing that the cold margin provides limited resistance to flow from up-glacier. Ice temperatures indicate that basal freezing occurs in this zone at 10–1 – 10–2 ma–1, but model results indicate that basal motion at rates greater than 1 ma–1 must, nevertheless, persist there for surface and basal velocities to be consistent with measurements. Estimated longitudinal compressive stresses of 20–25 kPa within the terminus further indicate that basal resistance offered by the cold-based terminus is small. These results indicate that where polythermal glaciers are underlain by unlithified sediments, ice-flow trajectories and sediment transport pathways may be affected by subglacial topography and hydrology more than by the basal thermal regime.

Comments

This is a manuscript of an article in Journal of Glaciology 57 (2011): 77, doi:10.3189/002214311795306583. Posted with permission.

Copyright Owner
Peter L. Moore, et al
Language
en
Date Available
2015-03-11
File Format
application/pdf
Citation Information
Peter Lindsay Moore, Neal R. Iverson, Keith A. Brugger, Denis Cohen, et al.. "Effect of a cold margin on ice flow at the terminus of Storglacïaren, Sweden: implications for sediment transport" Journal of Glaciology Vol. 57 Iss. 201 (2011) p. 77 - 87
Available at: http://works.bepress.com/peter_moore/8/