Documentation for PISM, the Parallel Ice Sheet Model


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applications:201712 [2017/12/20 02:16] (current)
Ed Bueler created by copy of future_applications:201712
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 +====== December 2017 ======
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 +| **[[http://​​doi/​10.1002/​2017JF004359/​abstract|Assimilating the ICE-6G_C reconstruction of the latest Quaternary ice-age cycle into numerical simulations of the Laurentide and Fennoscandian ice-sheets]]** ||
 +| **investigators**:​ | [[http://​​people/​gordan/​|G. Stuhne]] and W. Peltier|
 +| **journal**:​ | [[http://​​hub/​jgr/​journal/​10.1002/​(ISSN)2169-9011/​|J. Geophys. Res. Earth Surface]] |
 +Reconstructions of the time-dependent geometry of ice sheets over the last ice-age cycle (100kyr) can draw from two categories of data.  On one hand there are constraints from observations of GIA (glacial isostatic adjustment) and of eustatic sea-level through marine sediment stratigraphy. ​ These are constraints on ice geometry but via temporal and/or spatial integration. ​ On the other hand there is high temporal resolution, but geographically local, information in ice cores about climate over the same period. ​ The former category informs the output (ice thickness and grounding line) of the ice sheet evolution equations while the later inform the input (source term).
 +Like [[applications:​201512|Stuhne & Peltier (2015)]], this paper connects the two categories using PISM.  Because climate-record-driven applications of PISM, such as [[applications:​201303|the SeaRISE project]], already use well-posed simulations,​ a reconciliation of the two data categories is necessarily a temporal/​spatial inversion. ​ Here the goal is close fit to the GIA+eustatic-record-based ICE-6G_C ice thickness reconstruction from tuned ("​nudged"​) climate-input-driven PISM runs.  These authors analyze the amount of surface mass balance correction, applied using hypothesized characteristic time scales, needed to reduce the error between PISM output and ICE-6G_C. ​ An example of the usefulness of this methodology is in diagnosing the origin of Meltwater Pulse 1B (-11kyr). ​ They suggest it is more likely to have been in North America than in Antarctica, its origin in the ICE-6G_C reconstruction.
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applications/201712.txt ยท Last modified: 2017/12/20 02:16 by Ed Bueler
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