An Ice Sheet Model Validation Framework for the Greenland Ice Sheet

TitleAn Ice Sheet Model Validation Framework for the Greenland Ice Sheet
Publication TypeJournal Article
Year of Publication2017
AuthorsPrice, Stephen F., Hoffman Matthew J., Bonin Jennifer A., Howat Ian M., Neumann Thomas A., Saba Jack, Tezaur Irina, Guerber Jeffrey, Chambers Don P., Evans Katherine J., Kennedy Joseph H., Lenaerts Jan, Lipscomb William H., Perego Mauro, Salinger Andrew G., Tuminaro Raymond S., van den Broeke Michiel R., and Nowicki Sophie M. J.
Date Published01/2017
Abstract / Summary

We propose a new ice sheet model validation framework -- the Cryospheric Model Comparison Tool (CmCt) -- that takes advantage of ice sheet altimetry and gravimetry observations collected over the past several decades and is applied here to modeling of the Greenland ice sheet. We use realistic simulations performed with the Community Ice Sheet Model (CISM) along with two idealized, non-dynamic models to demonstrate the framework and its use. Dynamic simulations with CISM are forced from 1991 to 2013 using combinations of reanalysis-based surface mass balance and observations of outlet glacier flux change. We propose and demonstrate qualitative and quantitative metrics for use in evaluating the different model simulations against the observations. We find that the altimetry observations used here are largely ambiguous in terms of their ability to distinguish one simulation from another. Based on basin- and whole-ice-sheet scale metrics, we find that simulations using both idealized conceptual models and dynamic, numerical models provide an equally reasonable representation of the ice sheet surface (mean elevation differences of

DOI10.5194/gmd-10-1-2017
Year of Publication: 2017
Date Published: 01/2017

We propose a new ice sheet model validation framework -- the Cryospheric Model Comparison Tool (CmCt) -- that takes advantage of ice sheet altimetry and gravimetry observations collected over the past several decades and is applied here to modeling of the Greenland ice sheet. We use realistic simulations performed with the Community Ice Sheet Model (CISM) along with two idealized, non-dynamic models to demonstrate the framework and its use. Dynamic simulations with CISM are forced from 1991 to 2013 using combinations of reanalysis-based surface mass balance and observations of outlet glacier flux change. We propose and demonstrate qualitative and quantitative metrics for use in evaluating the different model simulations against the observations. We find that the altimetry observations used here are largely ambiguous in terms of their ability to distinguish one simulation from another. Based on basin- and whole-ice-sheet scale metrics, we find that simulations using both idealized conceptual models and dynamic, numerical models provide an equally reasonable representation of the ice sheet surface (mean elevation differences of

DOI: 10.5194/gmd-10-1-2017
Citation:
2017.  "An Ice Sheet Model Validation Framework for the Greenland Ice Sheet."  https://doi.org/10.5194/gmd-10-1-2017.