NEWS: Summer time!
The Parallel Ice Sheet Model pism0.7 is an open source, parallel, high-resolution ice sheet model. Features:
|Selective erosion beneath the Antarctic Peninsula Ice Sheet during LGM retreat|
This paper uses PISM to investigate how the last glacial maximum Antarctic Peninsula Ice Sheet might have modified its bed both at maximum extent and during progressive grounding line retreat. The work exploits high-resolution whole-Antarctic modelling by the same author (Golledge et al 2013, Golledge et al 2014). PISM results are post-processed to compute an erosion potential which is proportional to the product of modeled basal shear stress and sliding velocity. The results show that peak subglacial erosion rates are preferentially located in areas of convergent flow and where horizontal strain rates are highest, leading to deepening of subglacial basins in such locations. Because the ice sheet selectively erodes its bed beneath outlets, over successive glacial cycles erosional deepening may accelerate the retreat of the ice sheet margin during periods of rising sea level.
It's summer time; UAF PISM developers are currently writing proposals, work on their own projects, and enjoy the summer. Please give us some slack responding to questions, bug reports, etc. We will try fix serious bugs as quickly as possible though. We'll be back in Fall.
PETSc 3.6 was released on June 9, 2016. We are currently working on making PISM compatible with PETSc 3.6 and will announce it here as soon as possible.
In the meantime, please install petsc 3.5.4 from here. PISM version 0.7 (
stable0.7 branch) works with any PETSc 3.5.X.
This release has substantial changes to the code base, but users will not see large differences. The goal of most code changes is to improve maintainability, and our speed in fixing bugs and adding features, so we ask users to update from v0.6 unless they have a good reason against it.
If you already have a git repo for pism then upgrade by doing
git fetch origin git checkout stable0.7
in the PISM source tree. (Or get a new tagged
.zip at github.com/pism/pism/releases.) Then do
in the build directory.
The install directions in
INSTALL.md, included in the source release, should help with installation errors, but there is also an Installation Manual. Feel free to email email@example.com with installation questions; please include the failed commands and the error message(s).
Lists below give user-visible changes. For a full list of changes since v0.6, please see CHANGES.md in the source release.
Please send email to firstname.lastname@example.org for help with any version of PISM.
PISM is jointly developed at the University of Alaska, Fairbanks (UAF) and the Potsdam Institute for Climate Impact Research (PIK). UAF developers, who are in the Glaciers Group at the GI, are supported by NASA's Modeling, Analysis, and Prediction and Cryospheric Sciences Programs (grants NAG5-11371, NNX09AJ38C, NNX13AM16G, NNX13AK27G) and by the Arctic Region Supercomputing Center.