The Parallel Ice Sheet Model pism0.6 is an open source, parallel, high-resolution ice sheet model. Features:
|Spontaneous ice-front retreat caused by disintegration of adjacent ice shelf in Antarctica|
|investigators:||T. Albrecht and A. Levermann|
|journal:||Earth Planet. Sci. Lett.|
Floating ice shelves, fringing most of Antarctica, exert restraining forces on the ice flow. Though abrupt ice–shelf retreat has been observed, it is generally considered a localized phenomenon. This paper shows, by using PISM-PIK, that the disintegration of an ice shelf may induce the spontaneous retreat of its neighbor. The spontaneous but gradual retreat of the Larsen B ice front, as observed after the disintegration of the adjacent Larsen A ice shelf, is reproduced. The “A” collapse yields a change in spreading rate in “B”, via their connecting ice channels, and thereby causes a retreat of the ice front to its observed position of the year 2000. This reproduces the configuration of “B” prior to its collapse in 2002.
For the PISM user this paper illustrates what modeling becomes possible with the combined PIK mechanisms for ice shelf front modeling, including sub-grid mass conservation and “eigencalving”; see the references of the paper and Chapter 8 of the PISM User's Manual.
In a just-published Nature Climate Change article, Potsdam Institute for Climate Impact Research authors Matthias Mengel and Anders Levermann use PISM to define the “ice-plug” which, if removed from the coastal ice in the Wilkes Basin of East Antarctica, would initiate irreversible retreat of the grounded ice in that basin. The modeled retreats, which occur on a time scale of a few thousand years, generate 3–4 m of sea level rise from the region surrounding the basin. Thus this basin is a potential “tipping-point” ice sheet configuration, in additional to the better-known West Antarctica configurations.
For the PISM user this paper is an indication of its ability to model an ice sheet region (hashed in figure) at high resolution across a range of ice dynamics parameters and climate forcing choices.
See the stable version page to check out a copy of the PISM stable0.6 source code. If you have already checked out the prerelease version, just do
git pull and then
make install in your build directory. Send email to firstname.lastname@example.org for help with any version of PISM.
Changes since stable0.5 include
Please see the PISM's Python Documentation.
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.