An ice sheet model validation framework for the Greenland ice sheet
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 simulati...
Published in: | Geoscientific Model Development |
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Format: | Article in Journal/Newspaper |
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2017
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ftnonlinearchiv:oai:noa.gwlb.de:cop_mods_00042792 2023-05-15T16:21:29+02:00 An ice sheet model validation framework for the Greenland ice sheet Price, Stephen F. Hoffman, Matthew J. Bonin, Jennifer A. Howat, Ian M. Neumann, Thomas 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. Nowicki, Sophie M. J. 2017-01 electronic https://doi.org/10.5194/gmd-10-255-2017 https://noa.gwlb.de/receive/cop_mods_00042792 https://noa.gwlb.de/servlets/MCRFileNodeServlet/cop_derivate_00042412/gmd-10-255-2017.pdf https://gmd.copernicus.org/articles/10/255/2017/gmd-10-255-2017.pdf eng eng Copernicus Publications Geoscientific Model Development -- http://www.bibliothek.uni-regensburg.de/ezeit/?2456725 -- http://www.geosci-model-dev.net/ -- 1991-9603 https://doi.org/10.5194/gmd-10-255-2017 https://noa.gwlb.de/receive/cop_mods_00042792 https://noa.gwlb.de/servlets/MCRFileNodeServlet/cop_derivate_00042412/gmd-10-255-2017.pdf https://gmd.copernicus.org/articles/10/255/2017/gmd-10-255-2017.pdf uneingeschränkt info:eu-repo/semantics/openAccess article Verlagsveröffentlichung article Text doc-type:article 2017 ftnonlinearchiv https://doi.org/10.5194/gmd-10-255-2017 2022-02-08T22:40:55Z 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-scale 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 < 1 m). This is likely due to their short period of record, biases inherent to digital elevation models used for model initial conditions, and biases resulting from firn dynamics, which are not explicitly accounted for in the models or observations. On the other hand, we find that the gravimetry observations used here are able to unambiguously distinguish between simulations of varying complexity, and along with the CmCt, can provide a quantitative score for assessing a particular model and/or simulation. The new framework demonstrates that our proposed metrics can distinguish relatively better from relatively worse simulations and that dynamic ice sheet models, when appropriately initialized and forced with the right boundary conditions, demonstrate a predictive skill with respect to observed dynamic changes that have occurred on Greenland over the past few decades. An extensible design will allow for continued use of the CmCt as future altimetry, gravimetry, and other remotely sensed data become available for use in ice sheet model validation. Article in Journal/Newspaper glacier Greenland Ice Sheet Niedersächsisches Online-Archiv NOA Greenland Geoscientific Model Development 10 1 255 270 |
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Open Polar |
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Niedersächsisches Online-Archiv NOA |
op_collection_id |
ftnonlinearchiv |
language |
English |
topic |
article Verlagsveröffentlichung |
spellingShingle |
article Verlagsveröffentlichung Price, Stephen F. Hoffman, Matthew J. Bonin, Jennifer A. Howat, Ian M. Neumann, Thomas 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. Nowicki, Sophie M. J. An ice sheet model validation framework for the Greenland ice sheet |
topic_facet |
article Verlagsveröffentlichung |
description |
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-scale 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 < 1 m). This is likely due to their short period of record, biases inherent to digital elevation models used for model initial conditions, and biases resulting from firn dynamics, which are not explicitly accounted for in the models or observations. On the other hand, we find that the gravimetry observations used here are able to unambiguously distinguish between simulations of varying complexity, and along with the CmCt, can provide a quantitative score for assessing a particular model and/or simulation. The new framework demonstrates that our proposed metrics can distinguish relatively better from relatively worse simulations and that dynamic ice sheet models, when appropriately initialized and forced with the right boundary conditions, demonstrate a predictive skill with respect to observed dynamic changes that have occurred on Greenland over the past few decades. An extensible design will allow for continued use of the CmCt as future altimetry, gravimetry, and other remotely sensed data become available for use in ice sheet model validation. |
format |
Article in Journal/Newspaper |
author |
Price, Stephen F. Hoffman, Matthew J. Bonin, Jennifer A. Howat, Ian M. Neumann, Thomas 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. Nowicki, Sophie M. J. |
author_facet |
Price, Stephen F. Hoffman, Matthew J. Bonin, Jennifer A. Howat, Ian M. Neumann, Thomas 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. Nowicki, Sophie M. J. |
author_sort |
Price, Stephen F. |
title |
An ice sheet model validation framework for the Greenland ice sheet |
title_short |
An ice sheet model validation framework for the Greenland ice sheet |
title_full |
An ice sheet model validation framework for the Greenland ice sheet |
title_fullStr |
An ice sheet model validation framework for the Greenland ice sheet |
title_full_unstemmed |
An ice sheet model validation framework for the Greenland ice sheet |
title_sort |
ice sheet model validation framework for the greenland ice sheet |
publisher |
Copernicus Publications |
publishDate |
2017 |
url |
https://doi.org/10.5194/gmd-10-255-2017 https://noa.gwlb.de/receive/cop_mods_00042792 https://noa.gwlb.de/servlets/MCRFileNodeServlet/cop_derivate_00042412/gmd-10-255-2017.pdf https://gmd.copernicus.org/articles/10/255/2017/gmd-10-255-2017.pdf |
geographic |
Greenland |
geographic_facet |
Greenland |
genre |
glacier Greenland Ice Sheet |
genre_facet |
glacier Greenland Ice Sheet |
op_relation |
Geoscientific Model Development -- http://www.bibliothek.uni-regensburg.de/ezeit/?2456725 -- http://www.geosci-model-dev.net/ -- 1991-9603 https://doi.org/10.5194/gmd-10-255-2017 https://noa.gwlb.de/receive/cop_mods_00042792 https://noa.gwlb.de/servlets/MCRFileNodeServlet/cop_derivate_00042412/gmd-10-255-2017.pdf https://gmd.copernicus.org/articles/10/255/2017/gmd-10-255-2017.pdf |
op_rights |
uneingeschränkt info:eu-repo/semantics/openAccess |
op_doi |
https://doi.org/10.5194/gmd-10-255-2017 |
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Geoscientific Model Development |
container_volume |
10 |
container_issue |
1 |
container_start_page |
255 |
op_container_end_page |
270 |
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