Documentation for PISM, the Parallel Ice Sheet Model

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applications:201512 [2015/12/11 01:43]
Ed Bueler
applications:201512 [2015/12/11 01:44] (current)
Ed Bueler
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-ICE-6G_C ice thickness histories come from present-day uplift rates, exposure-age and radiocarbon dating, the theory of glacial isostatic adjustment (GIA), and a self-consistent theory of sea level. ​ Such reconstructions are independent of ice dynamical approximations. ​ This paper asks whether ICE-6G_C histories for the Greenland and Antarctic ice sheets are compatible with ice dynamics as represented by PISM models. ​  They infer compatibility when uncertainties in mass balance history are taken fully into account. ​ Uncertainties in atmospheric and sub-shelf mass balance since the Eemian (-122ka)---here represented by the SeaRISE paleo-modeling choices, along with simplifications in the PISM ice dynamics model, are carefully considered in a time-dependent inverse-modeling framework. ​ Holocene shoreline evidence for relative sea level changes, ​along with modeled ​present-day ice velocities and uplift rates (figure at left), are used to assess the agreement. ​ The magnitudes of the mass balance modifications needed to "​nudge"​ the thicknesses toward ICE-6G_C values, with several relaxation timescales considered, are evaluated as a measure of misfit between the reconstruction and the ice dynamical simulation.+ICE-6G_C ice thickness histories come from present-day uplift rates, exposure-age and radiocarbon dating, the theory of glacial isostatic adjustment (GIA), and a self-consistent theory of sea level. ​ Such reconstructions are independent of ice dynamical approximations. ​ This paper asks whether ICE-6G_C histories for the Greenland and Antarctic ice sheets are compatible with ice dynamics as represented by PISM models. ​  They infer compatibility when uncertainties in mass balance history are taken fully into account. ​ Uncertainties in atmospheric and sub-shelf mass balance since the Eemian (-122ka)---here represented by the SeaRISE paleo-modeling choices, along with simplifications in the PISM ice dynamics model, are carefully considered in a time-dependent inverse-modeling framework.  ​Modeled ​Holocene shoreline evidence for relative sea level changes, present-day ice velocitiesand present-day ​uplift rates (figure at left), are used to assess the agreement. ​ The magnitudes of the mass balance modifications needed to "​nudge"​ the thicknesses toward ICE-6G_C values, with several relaxation timescales considered, are evaluated as a measure of misfit between the reconstruction and the ice dynamical simulation.
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applications/201512.txt ยท Last modified: 2015/12/11 01:44 by Ed Bueler
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