Documentation for PISM, the Parallel Ice Sheet Model


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applications:201606 [2016/06/05 00:28] (current)
Ed Bueler created by copy of future_applications:201606
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 +====== June 2016 ======
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 +| **[[http://​​10.1038/​ncomms10524|Complex Greenland outlet glacier flow captured]]** ||
 +| **investigators**:​ | [[http://​​people/​aschwanden|A. Aschwanden]],​ M. Fahnestock, and M. Truffer|
 +| **journal**:​ | [[http://​​ncomms/​|Nature Communications]] |
 +The paper is based on PISM simulations of 600 m grid resolution over the entire Greenland ice sheet. ​ All parts of the ice sheet, and each outlet glacier in particular, see the same physics. ​ The quality of this flow model for 29 major outlet glaciers is assessed by comparison with present-day-observed surface velocities at cross-flow near-ocean profiles, often called "flux gates"​. ​ The main result is that the majority of the outlet glaciers show strong correlation between modeled and observed velocity. ​ The paper demonstrates that outlet glacier flow can be captured with high fidelity if ice thickness is well-constrained //and// if vertical shearing as well as membrane stresses are included in the model. ​ While it is not clear that solving the full-stress configuration would improve the fit, it //is// clear that the shallow hybrid model can be applied at higher resolution and for longer-duration runs.  Inversion of surface properties for individual glaciers is not essential to reproduce the overall flow pattern. ​ Spatial variability in flow can be explained in large part by the spatial variability in ice thickness.
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applications/201606.txt ยท Last modified: 2016/06/05 00:28 by Ed Bueler
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