The effect of climate forcing on numerical simulations of the Cordilleran ice sheet at the Last Glacial Maximum
We present an ensemble of numerical simulations of the Cordilleran ice sheet during the Last Glacial Maximum performed with the Parallel Ice Sheet Model (PISM), applying temperature offsets to the present-day climatologies from five different data sets. Monthly mean surface air temperature and preci...
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fttriple:oai:gotriple.eu:oai:doaj.org/article:ffb7747403af48b98a232e585ed40448 2023-05-15T16:39:47+02:00 The effect of climate forcing on numerical simulations of the Cordilleran ice sheet at the Last Glacial Maximum J. Seguinot C. Khroulev I. Rogozhina A. P. Stroeven Q. Zhang 2014-06-01 https://doi.org/10.5194/tc-8-1087-2014 http://www.the-cryosphere.net/8/1087/2014/tc-8-1087-2014.pdf https://doaj.org/article/ffb7747403af48b98a232e585ed40448 en eng Copernicus Publications 1994-0416 1994-0424 doi:10.5194/tc-8-1087-2014 http://www.the-cryosphere.net/8/1087/2014/tc-8-1087-2014.pdf https://doaj.org/article/ffb7747403af48b98a232e585ed40448 undefined The Cryosphere, Vol 8, Iss 3, Pp 1087-1103 (2014) geo envir Journal Article https://vocabularies.coar-repositories.org/resource_types/c_6501/ 2014 fttriple https://doi.org/10.5194/tc-8-1087-2014 2023-01-22T18:14:17Z We present an ensemble of numerical simulations of the Cordilleran ice sheet during the Last Glacial Maximum performed with the Parallel Ice Sheet Model (PISM), applying temperature offsets to the present-day climatologies from five different data sets. Monthly mean surface air temperature and precipitation from WorldClim, the NCEP/NCAR reanalysis, the ERA-Interim reanalysis, the Climate Forecast System Reanalysis and the North American Regional Reanalysis are used to compute surface mass balance in a positive degree-day model. Modelled ice sheet outlines and volumes appear highly sensitive to the choice of climate forcing. For three of the four reanalysis data sets used, differences in precipitation are the major source for discrepancies between model results. We assess model performance against a geomorphological reconstruction of the ice margin at the Last Glacial Maximum, and suggest that part of the mismatch is due to unresolved orographic precipitation effects caused by the coarse resolution of reanalysis data. The best match between model output and the reconstructed ice margin is obtained using the high-resolution North American Regional Reanalysis, which we retain for simulations of the Cordilleran ice sheet in the future. Article in Journal/Newspaper Ice Sheet The Cryosphere Unknown The Cryosphere 8 3 1087 1103 |
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geo envir |
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geo envir J. Seguinot C. Khroulev I. Rogozhina A. P. Stroeven Q. Zhang The effect of climate forcing on numerical simulations of the Cordilleran ice sheet at the Last Glacial Maximum |
topic_facet |
geo envir |
description |
We present an ensemble of numerical simulations of the Cordilleran ice sheet during the Last Glacial Maximum performed with the Parallel Ice Sheet Model (PISM), applying temperature offsets to the present-day climatologies from five different data sets. Monthly mean surface air temperature and precipitation from WorldClim, the NCEP/NCAR reanalysis, the ERA-Interim reanalysis, the Climate Forecast System Reanalysis and the North American Regional Reanalysis are used to compute surface mass balance in a positive degree-day model. Modelled ice sheet outlines and volumes appear highly sensitive to the choice of climate forcing. For three of the four reanalysis data sets used, differences in precipitation are the major source for discrepancies between model results. We assess model performance against a geomorphological reconstruction of the ice margin at the Last Glacial Maximum, and suggest that part of the mismatch is due to unresolved orographic precipitation effects caused by the coarse resolution of reanalysis data. The best match between model output and the reconstructed ice margin is obtained using the high-resolution North American Regional Reanalysis, which we retain for simulations of the Cordilleran ice sheet in the future. |
format |
Article in Journal/Newspaper |
author |
J. Seguinot C. Khroulev I. Rogozhina A. P. Stroeven Q. Zhang |
author_facet |
J. Seguinot C. Khroulev I. Rogozhina A. P. Stroeven Q. Zhang |
author_sort |
J. Seguinot |
title |
The effect of climate forcing on numerical simulations of the Cordilleran ice sheet at the Last Glacial Maximum |
title_short |
The effect of climate forcing on numerical simulations of the Cordilleran ice sheet at the Last Glacial Maximum |
title_full |
The effect of climate forcing on numerical simulations of the Cordilleran ice sheet at the Last Glacial Maximum |
title_fullStr |
The effect of climate forcing on numerical simulations of the Cordilleran ice sheet at the Last Glacial Maximum |
title_full_unstemmed |
The effect of climate forcing on numerical simulations of the Cordilleran ice sheet at the Last Glacial Maximum |
title_sort |
effect of climate forcing on numerical simulations of the cordilleran ice sheet at the last glacial maximum |
publisher |
Copernicus Publications |
publishDate |
2014 |
url |
https://doi.org/10.5194/tc-8-1087-2014 http://www.the-cryosphere.net/8/1087/2014/tc-8-1087-2014.pdf https://doaj.org/article/ffb7747403af48b98a232e585ed40448 |
genre |
Ice Sheet The Cryosphere |
genre_facet |
Ice Sheet The Cryosphere |
op_source |
The Cryosphere, Vol 8, Iss 3, Pp 1087-1103 (2014) |
op_relation |
1994-0416 1994-0424 doi:10.5194/tc-8-1087-2014 http://www.the-cryosphere.net/8/1087/2014/tc-8-1087-2014.pdf https://doaj.org/article/ffb7747403af48b98a232e585ed40448 |
op_rights |
undefined |
op_doi |
https://doi.org/10.5194/tc-8-1087-2014 |
container_title |
The Cryosphere |
container_volume |
8 |
container_issue |
3 |
container_start_page |
1087 |
op_container_end_page |
1103 |
_version_ |
1766030116084776960 |