Documentation for PISM, a parallel Ice Sheet Model

NEWS: EGU Early Career Award for PISM-author Ricarda Winkelmann

The Parallel Ice Sheet Model pism0.7 is open source and capable of high resolution. It is widely adopted as a tool for doing science. Features include:

PISM Application of the Month

June 2017

Glacial erratic boulders in the Rhone Valley north of the Alps, which have intrigued scientists for two centuries, have characteristic lithologies which can be matched to source regions in the mountains. This study uses their locations, plus the maximum extent of the ice sheet (e.g. moraine mapping), to constrain a PISM model (Becker et al 2016) of the ice flow around the time of the Last Glacial Maximum (LGM, ~24ka b.p.). The 1 km grid, physically-comprehensive model, which includes membrane-stress-balanced sliding, polythermal thermodynamics, and earth deformation, generates the evolving ice geometry and velocity fields. The boulders are modeled as tracers within the time-dependent flow.

The dominant flow fields in the Valley, including the distinctive erratics signature of the northeastern Solothurn ice sheet lobe, turn out to be insensitive to sliding parameters and bed elevation in the model. Instead, the authors are able to infer the paleo-climatic conditions responsible for the transport routes of the erratics. They show that only one tested precipitation pattern allows boulders to be (correctly) diverted into the Solothurn lobe during the LGM. This precipitation pattern supports, but suggests additional detail in, an existing theory of preferential moisture advection during the LGM.

A spectacular video of a full simulation of the ice sheet, over the entire 120ka ice age cycle, is at co-author J. Seguinot's website.

2017/06/15 18:29 · Ed Bueler

Latest News

New PISM user help email: uaf-pism@alaska.edu

The core team at UAF continues to support PISM users. The new email for help is uaf-pism@alaska.edu; it replaces help@pism-docs.org. As before, email to this address will be distributed to all the UAF developers, and so it will get the most prompt response year-round.

2017/02/21 20:47 · Ed Bueler

Study of Juneau Ice Field in Cambridge Core news

A recent PISM application Ziemen et al (2016) is covered by a news item in Cambridge Core news.

The 4000 square km ice field in Southeast Alaska is well-known and accessible since its outlets are in the suburbs of the Alaska state capital, Juneau. But climate data for the area are sparse.

Those model runs that agreed well with observations for 1971 to 2010 generated volume and area losses of more than half by 2099. While co-author Regine Hock (UAF) is quoted as saying “The massive icefield that feeds Alaska’s Mendenhall Glacier may be gone by 2200 if warming trend predictions hold true,”, the authors emphasize that spatially-distributed mass balance measurements and improved climate projections that resolve the local temperature and precipitation patterns are essential to solidifying these predictions.

2016/10/06 14:26 · Ed Bueler

Reminder for authors of PISM-using papers

Please acknowledge the funding that makes PISM possible, and which supports its continued maintenance and technical support. Include the sentence “Development of PISM is supported by NASA grants NNX13AM16G and NNX13AK27G.” in the Acknowledgments part of your paper.

If authors do this consistently then it will help to ensure continued funding of PISM!

For specific suggestions on how to cite the design or justification of PISM see this page.

2016/08/18 11:44 · Ed Bueler

PISM team

PISM is jointly developed at the University of Alaska, Fairbanks (UAF) and the Potsdam Institute for Climate Impact Research (PIK). For more about the team see the UAF Developers and PIK Developers pages.

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, NNX16AQ40G, NNX17AG65G) and by NSF grants PLR-1603799 and PLR-1644277.

home.txt · Last modified: 2017/04/27 13:26 by Ed Bueler
© 2016 by PISM | webmaster