Documentation for PISM, the Parallel Ice Sheet Model


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applications:201412 [2014/12/04 16:47] (current)
Ed Bueler created by copying future_applications version
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 +====== December 2014 ======
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 +[[http://​​8/​587/​2014/​tc-8-587-2014.html|{{ :​applications:​albrechtlevermann2014-softening.png?​450 |}}]]
 +Surface velocity, calculated fracture density, and modeled flow results for Filchner Ice Shelf. ​ Click the image to go to //The Cryosphere//​ article page.
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 +| **Fracture-induced softening for large-scale ice dynamics** ||
 +| **investigators**:​ | [[http://​​~albrecht/​|T. Albrecht]] and A. Levermann|
 +| **journal**:​ | [[http://​​|The Cryosphere]] |
 +Fracture processes within ice shelfs have been observed to reduce the retentive forces of the shelves on the Antarctic ice sheet. ​ This paper adds a continuum representation of fractures, and their evolution, to PISM, and applies it to several major ice shelves in Antarctica. ​ A key addition is the introduction of a higher-order scheme for advecting the two-dimensional fracture density field. ​ Fractures and ice flow are coupled through a reduction of modeled ice viscosity proportional to the fracture density, so fracture-induced softening can feed back to cause added shear and self-amplified fracturing. ​ The results of the simulations are compared to observations. ​ Observed sharp across-flow velocity gradients in fracture-weakened regions are reproduced. ​ This fracture-softening model is a basis for a future model of enhanced fracture-based calving.
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applications/201412.txt ยท Last modified: 2014/12/04 16:47 by Ed Bueler
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