Till beneath ice stream B. 4. A coupled ice-till flow model

R. B. Alley, D. D. Blankenship, S. T. Rooney, C. R. Bentley

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Abstract

An analytic, steady state solution for ice stream B shows that till viscosity decreases slowly downstream, probably in response to decreasing effective pressure downstream. Nonsteady numerical experiments with fixed ice thicknesses at the ends show that a marginal perturbation causes a wave of adjustment to travel the length of the ice stream in about 50 years, with a new steady state in about 200 years. Changes in till thickness tend to moderate perturbations in the ice and thus stabilize the system. -from Authors

Original languageEnglish (US)
Pages (from-to)8931-8940
Number of pages10
JournalJournal of Geophysical Research
Volume93
Issue numberB9
Publication statusPublished - Jan 1 1987

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All Science Journal Classification (ASJC) codes

  • Geophysics
  • Forestry
  • Oceanography
  • Aquatic Science
  • Ecology
  • Water Science and Technology
  • Soil Science
  • Geochemistry and Petrology
  • Earth-Surface Processes
  • Atmospheric Science
  • Earth and Planetary Sciences (miscellaneous)
  • Space and Planetary Science
  • Palaeontology

Cite this

Alley, R. B., Blankenship, D. D., Rooney, S. T., & Bentley, C. R. (1987). Till beneath ice stream B. 4. A coupled ice-till flow model. Journal of Geophysical Research, 93(B9), 8931-8940.