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An assessment of key model parametric uncertainties in projections of Greenland Ice Sheet behavior

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Please use this identifier to cite or link to this item:http://hdl.handle.net/2115/49381

Title: An assessment of key model parametric uncertainties in projections of Greenland Ice Sheet behavior
Authors: Applegate, Patrick J. Browse this author
Kirchner, Nina Browse this author
Stone, Emma J. Browse this author
Keller, Klaus Browse this author
Greve, Ralf Browse this author →KAKEN DB
Keywords: Greenland ice sheet
Uncertainty
Input parameter
Climate change
Ice sheet modelling
Issue Date: 30-May-2012
Publisher: Copernicus Publications
Journal Title: The Cryosphere
Volume: 6
Issue: 3
Start Page: 589
End Page: 606
Publisher DOI: 10.5194/tc-6-589-2012
Abstract: Lack of knowledge about the values of ice sheet model input parameters introduces substantial uncertainty into projections of Greenland Ice Sheet contributions to future sea level rise. Computer models of ice sheet behavior provide one of several means of estimating future sea level rise due to mass loss from ice sheets. Such models have many input parameters whose values are not well known. Recent studies have investigated the effects of these parameters on model output, but the range of potential future sea level increases due to model parametric uncertainty has not been characterized. Here, we demonstrate that this range is large, using a 100-member perturbed-physics ensemble with the SICOPOLIS ice sheet model. Each model run is spun up over 125000 yr using geological forcings and subsequently driven into the future using an asymptotically increasing air temperature anomaly curve. All modeled ice sheets lose mass after 2005 AD. Parameters controlling surface melt dominate the model response to temperature change. After culling the ensemble to include only members that give reasonable ice volumes in 2005 AD, the range of projected sea level rise values in 2100 AD is ~40% or more of the median. Data on past ice sheet behavior can help reduce this uncertainty, but none of our ensemble members produces a reasonable ice volume change during the mid-Holocene, relative to the present. This problem suggests that the model's exponential relation between temperature and precipitation does not hold during the Holocene, or that the central-Greenland temperature forcing curve used to drive the model is not representative of conditions around the ice margin at this time (among other possibilities). Our simulations also lack certain observed physical processes that may tend to enhance the real ice sheet's response. Regardless, this work has implications for other studies that use ice sheet models to project or hindcast the behavior of the Greenland Ice Sheet.
Rights: http://creativecommons.org/licenses/by/3.0/
Type: article
URI: http://hdl.handle.net/2115/49381
Appears in Collections:低温科学研究所 (Institute of Low Temperature Science) > 雑誌発表論文等 (Peer-reviewed Journal Articles, etc)

Submitter: Greve Ralf

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