Documentation for PISM, the Parallel Ice Sheet Model

November 2013

Click the image to go to the paper at The Cryosphere website

An iterative inverse method to estimate basal topography and initialize ice flow models
investigators: W. van Pelt and others
journal: The Cryosphere

A new inverse approach to reconstruct distributed bedrock topography and simultaneously initialize an ice flow model is proposed. The procedure runs PISM multiple times over a prescribed period, while being forced with space- and time-dependent climate input. After each iteration bed heights are adjusted using information of the remaining misfit between observed and modeled surface topography. Synthetic experiments with constant-climate forcing demonstrate convergence and robustness of the approach. Application to Nordenskiöldbreen, Svalbard, forced with height- and time-dependent climate input since 1300 AD show a high correlation against radar-observed thicknesses. Remaining uncertainties can be ascribed to inaccurate model physics, in particular, uncertainty in the description of sliding.

applications/201311.txt · Last modified: 2013/10/31 11:07 by Ed Bueler
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