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      A Three-Dimensional Time-Dependent Model of the West Antarctic Ice Sheet

      Author(s): , ,
      Publication date (Print):
      Journal: Annals of Glaciology
      Publisher: Cambridge University Press (CUP)

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          Abstract

          The area of West Antarctica which drains into the Ross Ice Shelf is examined for the purpose of understanding its dynamics and developing a numerical model to study its reaction to environmental changes. A high resolution 20 km grid is used to compile a database for surface and bedrock elevation, accumulation, and surface temperatures. Balance velocities Vbare computed and found to approximate observed velocities. These balance velocities are used with basal shear stress and ice thickness above buoyancy Z*to derive parameters k2, p and q for a sliddinq relation of the form

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          Is the west Antarctic Ice Sheet disintegrating?

          T. Hughes (1973)
          Article 0 comments Cited 95 times – based on 0 reviews     Review now
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            The West Antarctic Ice Sheet: Instability, disintegration, and initiation of Ice Ages

            T. Hughes (1975)
            Article 0 comments Cited 67 times – based on 0 reviews     Review now
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              Empirical Studies of Ice Sliding

              N. Blundy, P. Keage, W. F. Budd (1979)
              An experimental programme has been carried out for studying temperate-ice sliding over rock surfaces with a wide range of roughnesses, for normal and shear stresses comparable to those expected under real ice masses. The limiting static shear stress for acceleration has been found to be directly proportional to the normal load giving a constant limiting coefficient of static friction characteristic of the surface. For a constant applied normal stress N and shear stress τ b, well below the limiting static shear, a steady velocity Vb results which increases approximately proportionally to τ b and decreases with increasing N and the roughness of the surface. For high normal stress the velocity becomes approximately proportional to the shear stress cubed and inversely proportional to the normal stress. As the shear stress increases acceleration sets in, which, for different roughness and normal loads, tends to occur for a constant value of the product τ b Vb . For some surfaces at high normal loads this acceleration was retarded by erosion. For constant-applied-velocity tests a steady shear stress resulted, which tended to become constant with high velocities, and which increased with increasing normal stress but with a reduced coefficient of sliding friction. The relevance of the results to the sliding of real ice masses is discussed with particular reference to the importance of the effect of the relative normal stress, above basal water pressure, to the sliding rate.
              Article 0 comments Cited 62 times – based on 0 reviews     Review now
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                Author and article information

                Journal
                Journal ID (publisher-id): applab
                Title: Annals of Glaciology
                Abbreviated Title: A. Glaciology.
                Publisher: Cambridge University Press (CUP)
                ISSN (Print): 0260-3055
                ISSN (Electronic): 1727-5644
                Publication date Created: 1984
                Publication date (Print): January 2017
                Volume: 5
                Issue:
                Pages: 29-36
                Article
                DOI: 10.1017/S026030550000344X
                SO-VID: e190405a-507f-4339-8e9e-33f79605bd97
                Copyright © © 1984
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