Flow law for ice in polar ice sheets
Theories of glacier flow are based commonly on the assumption that ice is not a newtonian fluid, but has a non-linear stress-dependent viscosity1–5. Here we re-examine the spreading of Antarctic ice shelves and suggest that the data cannot define a unique flow law. Tilt measurements in four borehole...
| Published in: | Nature |
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| Main Authors: | , |
| Format: | Article in Journal/Newspaper |
| Language: | unknown |
| Published: |
1985
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| Subjects: | |
| Online Access: | http://nora.nerc.ac.uk/id/eprint/523337/ https://doi.org/10.1038/314255a0 |
| Summary: | Theories of glacier flow are based commonly on the assumption that ice is not a newtonian fluid, but has a non-linear stress-dependent viscosity1–5. Here we re-examine the spreading of Antarctic ice shelves and suggest that the data cannot define a unique flow law. Tilt measurements in four boreholes in both the Arctic and Antarctic seem to show that a linear flow law ε̇ = A1τ (where A1∼10−15 s−1 Pa−1 at −28 °C), where ε̇ is the effective strain rate and τ the effective shear stress, may be just as appropriate for describing the flow of polar ice sheets. |
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