The Parallel Ice Sheet Model pism0.6 is an open source, parallel, high-resolution ice sheet model. Features:
|Mountain building and the initiation of the Greenland Ice Sheet|
|investigators:||A. Solgaard, J. Bonow, P. Langen, P. Japsen, and C. Hvidberg|
|journal:||Palaeogeography, Palaeoclimatology, Palaeoecology|
In this paper, effects of a new hypothesis about mountain building in Greenland on ice sheet initiation are investigated using PISM in combination with a climate model. According to this hypothesis, low-relief landscapes near sea level characterized Greenland in the Miocene. Then two phases of km-scale uplift, beginning at 10 and ~5 Ma, respectively, initiated the formation of the present-day mountains. These results are consistent with the observed climatic variability superimposed on the general cooling trend in the late Cenozoic, and they indicate that the Greenland Ice Sheet of today is a relict formed under colder conditions. The late Cenozoic mountain building in Greenland augments the effects of the climatic deterioration leading to the Northern Hemisphere glaciations. Without the second phase of uplift, the Greenland Ice Sheet would have been more sensitive to the changes in climate over the past millions of years.
Since 2012 there have been seven Ph.D. students who have completed their degrees using PISM as a major tool in their research. The new year is a good time to feature their accomplishments on the PISM front page!
A dynamic memory of fracture processes in ice shelves, Ph.D. Potsdam University 2013; advisor A. Levermann; publications including Albrecht et al. (2011) and Albrecht and Levermann (2012); personal webpage
Basal shear strength inversions for ice sheets with an application to Jakobshavn Isbrae, Greenland, Ph.D. University of Alaska Fairbanks 2013; advisor M. Truffer; publications including Habermann, Truffer, and Maxwell (2013); personal webpage
Numerical simulation of the Antarctic ice sheet and its dynamic response to external perturbation, Ph.D. Potsdam University 2012; advisor A. Levermann; publications including Martin et al. (2011); personal webpage
Modelling the dynamics and boundary processes of Svalbard glaciers, Ph.D. Universiteit Utrecht 2014; advisor J. Oerlemans; publications including van Pelt and Oerlemans (2012) and van Pelt et al. (2013); personal webpage
Large-scale modeling of the Greenland Ice Sheet on long timescales, Ph.D. University Copenhagen 2012; advisors C. Hvidberg and G. Adalgeirsdottir; publications including Solgaard et al. (2011), Solgaard and Langen (2012), and Solgaard et al. (2013); personal webpage
The future sea-level contribution from Antarctica: Projections of solid ice discharge, Ph.D. Potsdam University 2012; advisors S. Rahmstorf and A. Levermann; publications including Winkelmann et al. (2011), Winkelmann et al. (2012), Winkelmann and Levermann (2013); personal webpage
Glacial climate variability, Ph.D. Universität Hamburg 2013; advisor U. Mikolajewicz; personal webpage
We have been notified that two PISM-supporting NASA research proposals have been selected for funding, one in the Cryospheric Sciences program and one in the Modeling, Analysis, and Prediction (MAP) program. Our proposed research threads focus on the dynamics of the Greenland ice sheet and on the exploitation of NASA remote observations as constraints. The current MAP grant expires in the next few months, so this news is timely. The new grants support PISM development and application for four years, through mid-2017. They include support for UAF researchers Ed Bueler, Andy Aschwanden, and Mark Fahnestock, and full-time support for scientific programmer Constantine Khroulev.
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.