Remapping of Greenland ice sheet surface mass balance anomalies for large ensemble sea-level change projections
Future sea-level change projections with process-based standalone ice sheet models are typically driven with surface mass balance (SMB) forcing derived from climate models. In this work we address the problems arising from a mismatch of the modelled ice sheet geometry with the one used by the climat...
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ftcopernicus:oai:publications.copernicus.org:tcd79207 2023-05-15T16:27:51+02:00 Remapping of Greenland ice sheet surface mass balance anomalies for large ensemble sea-level change projections Goelzer, Heiko Noel, Brice P. Y. Edwards, Tamsin L. Fettweis, Xavier Gregory, Jonathan M. Lipscomb, William H. Wal, Roderik S. W. Broeke, Michiel R. 2019-09-04 application/pdf https://doi.org/10.5194/tc-2019-188 https://www.the-cryosphere-discuss.net/tc-2019-188/ eng eng doi:10.5194/tc-2019-188 https://www.the-cryosphere-discuss.net/tc-2019-188/ eISSN: 1994-0424 Text 2019 ftcopernicus https://doi.org/10.5194/tc-2019-188 2019-12-24T09:48:34Z Future sea-level change projections with process-based standalone ice sheet models are typically driven with surface mass balance (SMB) forcing derived from climate models. In this work we address the problems arising from a mismatch of the modelled ice sheet geometry with the one used by the climate model. We present a method to apply SMB forcing from climate models to a wide range of Greenland ice sheet models with varying and temporally evolving geometries. In order to achieve that, we translate a given SMB anomaly field as a function of absolute location, to a function of surface elevation for 25 regional drainage basins, which can then be applied to different modelled ice sheet geometries. The key feature of the approach is the non-locality of this remapping process. The method reproduces the original forcing data closely when remapped to the original geometry. When remapped to different modelled geometries it produces a physically meaningful forcing with smooth and continuous SMB anomalies across basin divides. The method considerably reduces non-physical biases that would arise by applying the SMB anomaly derived for the observed geometry directly to a large range of modelled ice sheet model geometries. Text Greenland Ice Sheet Copernicus Publications: E-Journals Greenland |
institution |
Open Polar |
collection |
Copernicus Publications: E-Journals |
op_collection_id |
ftcopernicus |
language |
English |
description |
Future sea-level change projections with process-based standalone ice sheet models are typically driven with surface mass balance (SMB) forcing derived from climate models. In this work we address the problems arising from a mismatch of the modelled ice sheet geometry with the one used by the climate model. We present a method to apply SMB forcing from climate models to a wide range of Greenland ice sheet models with varying and temporally evolving geometries. In order to achieve that, we translate a given SMB anomaly field as a function of absolute location, to a function of surface elevation for 25 regional drainage basins, which can then be applied to different modelled ice sheet geometries. The key feature of the approach is the non-locality of this remapping process. The method reproduces the original forcing data closely when remapped to the original geometry. When remapped to different modelled geometries it produces a physically meaningful forcing with smooth and continuous SMB anomalies across basin divides. The method considerably reduces non-physical biases that would arise by applying the SMB anomaly derived for the observed geometry directly to a large range of modelled ice sheet model geometries. |
format |
Text |
author |
Goelzer, Heiko Noel, Brice P. Y. Edwards, Tamsin L. Fettweis, Xavier Gregory, Jonathan M. Lipscomb, William H. Wal, Roderik S. W. Broeke, Michiel R. |
spellingShingle |
Goelzer, Heiko Noel, Brice P. Y. Edwards, Tamsin L. Fettweis, Xavier Gregory, Jonathan M. Lipscomb, William H. Wal, Roderik S. W. Broeke, Michiel R. Remapping of Greenland ice sheet surface mass balance anomalies for large ensemble sea-level change projections |
author_facet |
Goelzer, Heiko Noel, Brice P. Y. Edwards, Tamsin L. Fettweis, Xavier Gregory, Jonathan M. Lipscomb, William H. Wal, Roderik S. W. Broeke, Michiel R. |
author_sort |
Goelzer, Heiko |
title |
Remapping of Greenland ice sheet surface mass balance anomalies for large ensemble sea-level change projections |
title_short |
Remapping of Greenland ice sheet surface mass balance anomalies for large ensemble sea-level change projections |
title_full |
Remapping of Greenland ice sheet surface mass balance anomalies for large ensemble sea-level change projections |
title_fullStr |
Remapping of Greenland ice sheet surface mass balance anomalies for large ensemble sea-level change projections |
title_full_unstemmed |
Remapping of Greenland ice sheet surface mass balance anomalies for large ensemble sea-level change projections |
title_sort |
remapping of greenland ice sheet surface mass balance anomalies for large ensemble sea-level change projections |
publishDate |
2019 |
url |
https://doi.org/10.5194/tc-2019-188 https://www.the-cryosphere-discuss.net/tc-2019-188/ |
geographic |
Greenland |
geographic_facet |
Greenland |
genre |
Greenland Ice Sheet |
genre_facet |
Greenland Ice Sheet |
op_source |
eISSN: 1994-0424 |
op_relation |
doi:10.5194/tc-2019-188 https://www.the-cryosphere-discuss.net/tc-2019-188/ |
op_doi |
https://doi.org/10.5194/tc-2019-188 |
_version_ |
1766017406677811200 |