GREB-ISM v0.3: A coupled ice sheet model for the Global Resolved Energy Balance model for global simulations on time-scales of 100 kyr
We introduce a newly developed global ice sheet model coupled to the Globally Resolved Energy Balance (GREB) climate model for the simulation of global ice sheet evolution on time scales of 100 kyr or longer (GREB-ISM v0.3). Ice sheets and ice shelves are simulated on a global grid, fully interactin...
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ftcopernicus:oai:publications.copernicus.org:gmdd95560 2023-05-15T14:02:17+02:00 GREB-ISM v0.3: A coupled ice sheet model for the Global Resolved Energy Balance model for global simulations on time-scales of 100 kyr Xie, Zhiang Dommenget, Dietmar McCormack, Felicity S. Mackintosh, Andrew N. 2021-07-26 application/pdf https://doi.org/10.5194/gmd-2021-204 https://gmd.copernicus.org/preprints/gmd-2021-204/ eng eng doi:10.5194/gmd-2021-204 https://gmd.copernicus.org/preprints/gmd-2021-204/ eISSN: 1991-9603 Text 2021 ftcopernicus https://doi.org/10.5194/gmd-2021-204 2021-08-02T16:22:29Z We introduce a newly developed global ice sheet model coupled to the Globally Resolved Energy Balance (GREB) climate model for the simulation of global ice sheet evolution on time scales of 100 kyr or longer (GREB-ISM v0.3). Ice sheets and ice shelves are simulated on a global grid, fully interacting with the climate simulation of surface temperature, precipitation, albedo, land-sea mask, topography and sea level. Thus, it is a fully coupled atmosphere, ocean, land and ice sheet model. We test the model in ice sheet stand-alone and fully coupled simulations. The ice sheet model dynamics behave similarly to other hybrid SIA (Shallow Ice Approximation) and SSA (Shallow Shelf Approximation) models, but the West Antarctic Ice Sheet accumulates too much ice using present-day boundary conditions. The coupled model simulations produce global equilibrium ice sheet volumes and calving rates similar to observed for present day boundary conditions. We designed a series of idealised experiments driven by oscillating solar radiation forcing on periods of 20 kyr, 50 kyr and 100 kyr in the Northern Hemisphere. These simulations show clear interactions between the climate system and ice sheets, resulting in slow build-up and fast decay of ice-covered areas and global ice volume. The results also show that Northern Hemisphere ice sheets respond more strongly to time scales longer than 100 kyr. The coupling to the atmosphere and sea level leads to climate interactions between the Northern and Southern Hemispheres. The model can run global simulations of 100 kyr per day on a desktop computer, allowing the simulation of the whole Quaternary period (2.6 Myrs) within one month. Text Antarc* Antarctic Ice Sheet Ice Shelves ice covered areas Copernicus Publications: E-Journals Antarctic West Antarctic Ice Sheet |
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Open Polar |
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Copernicus Publications: E-Journals |
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ftcopernicus |
language |
English |
description |
We introduce a newly developed global ice sheet model coupled to the Globally Resolved Energy Balance (GREB) climate model for the simulation of global ice sheet evolution on time scales of 100 kyr or longer (GREB-ISM v0.3). Ice sheets and ice shelves are simulated on a global grid, fully interacting with the climate simulation of surface temperature, precipitation, albedo, land-sea mask, topography and sea level. Thus, it is a fully coupled atmosphere, ocean, land and ice sheet model. We test the model in ice sheet stand-alone and fully coupled simulations. The ice sheet model dynamics behave similarly to other hybrid SIA (Shallow Ice Approximation) and SSA (Shallow Shelf Approximation) models, but the West Antarctic Ice Sheet accumulates too much ice using present-day boundary conditions. The coupled model simulations produce global equilibrium ice sheet volumes and calving rates similar to observed for present day boundary conditions. We designed a series of idealised experiments driven by oscillating solar radiation forcing on periods of 20 kyr, 50 kyr and 100 kyr in the Northern Hemisphere. These simulations show clear interactions between the climate system and ice sheets, resulting in slow build-up and fast decay of ice-covered areas and global ice volume. The results also show that Northern Hemisphere ice sheets respond more strongly to time scales longer than 100 kyr. The coupling to the atmosphere and sea level leads to climate interactions between the Northern and Southern Hemispheres. The model can run global simulations of 100 kyr per day on a desktop computer, allowing the simulation of the whole Quaternary period (2.6 Myrs) within one month. |
format |
Text |
author |
Xie, Zhiang Dommenget, Dietmar McCormack, Felicity S. Mackintosh, Andrew N. |
spellingShingle |
Xie, Zhiang Dommenget, Dietmar McCormack, Felicity S. Mackintosh, Andrew N. GREB-ISM v0.3: A coupled ice sheet model for the Global Resolved Energy Balance model for global simulations on time-scales of 100 kyr |
author_facet |
Xie, Zhiang Dommenget, Dietmar McCormack, Felicity S. Mackintosh, Andrew N. |
author_sort |
Xie, Zhiang |
title |
GREB-ISM v0.3: A coupled ice sheet model for the Global Resolved Energy Balance model for global simulations on time-scales of 100 kyr |
title_short |
GREB-ISM v0.3: A coupled ice sheet model for the Global Resolved Energy Balance model for global simulations on time-scales of 100 kyr |
title_full |
GREB-ISM v0.3: A coupled ice sheet model for the Global Resolved Energy Balance model for global simulations on time-scales of 100 kyr |
title_fullStr |
GREB-ISM v0.3: A coupled ice sheet model for the Global Resolved Energy Balance model for global simulations on time-scales of 100 kyr |
title_full_unstemmed |
GREB-ISM v0.3: A coupled ice sheet model for the Global Resolved Energy Balance model for global simulations on time-scales of 100 kyr |
title_sort |
greb-ism v0.3: a coupled ice sheet model for the global resolved energy balance model for global simulations on time-scales of 100 kyr |
publishDate |
2021 |
url |
https://doi.org/10.5194/gmd-2021-204 https://gmd.copernicus.org/preprints/gmd-2021-204/ |
geographic |
Antarctic West Antarctic Ice Sheet |
geographic_facet |
Antarctic West Antarctic Ice Sheet |
genre |
Antarc* Antarctic Ice Sheet Ice Shelves ice covered areas |
genre_facet |
Antarc* Antarctic Ice Sheet Ice Shelves ice covered areas |
op_source |
eISSN: 1991-9603 |
op_relation |
doi:10.5194/gmd-2021-204 https://gmd.copernicus.org/preprints/gmd-2021-204/ |
op_doi |
https://doi.org/10.5194/gmd-2021-204 |
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1766272452433805312 |