Regional grid refinement in an Earth system model: impacts on the simulated Greenland surface mass balance
In this study, the resolution dependence of the simulated Greenland ice sheet surface mass balance (GrIS SMB) in the variable-resolution Community Earth System Model (VR-CESM) is investigated. Coupled atmosphere–land simulations are performed on two regionally refined grids over Greenland at 0.5 ∘ (...
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ftcopernicus:oai:publications.copernicus.org:tc73105 2023-05-15T16:27:01+02:00 Regional grid refinement in an Earth system model: impacts on the simulated Greenland surface mass balance Kampenhout, Leonardus Rhoades, Alan M. Herrington, Adam R. Zarzycki, Colin M. Lenaerts, Jan T. M. Sacks, William J. Broeke, Michiel R. 2019-06-03 application/pdf https://doi.org/10.5194/tc-13-1547-2019 https://tc.copernicus.org/articles/13/1547/2019/ eng eng doi:10.5194/tc-13-1547-2019 https://tc.copernicus.org/articles/13/1547/2019/ eISSN: 1994-0424 Text 2019 ftcopernicus https://doi.org/10.5194/tc-13-1547-2019 2020-07-20T16:22:48Z In this study, the resolution dependence of the simulated Greenland ice sheet surface mass balance (GrIS SMB) in the variable-resolution Community Earth System Model (VR-CESM) is investigated. Coupled atmosphere–land simulations are performed on two regionally refined grids over Greenland at 0.5 ∘ ( ∼55 km) and 0.25 ∘ ( ∼28 km), maintaining a quasi-uniform resolution of 1 ∘ ( ∼111 km) over the rest of the globe. On the refined grids, the SMB in the accumulation zone is significantly improved compared to airborne radar and in situ observations, with a general wetting (more snowfall) at the margins and a drying (less snowfall) in the interior GrIS. Total GrIS precipitation decreases with resolution, which is in line with best-available regional climate model results. In the ablation zone, CESM starts developing a positive SMB bias with increased resolution in some basins, notably in the east and the north. The mismatch in ablation is linked to changes in cloud cover in VR-CESM, and a reduced effectiveness of the elevation classes subgrid parametrization in CESM. Overall, our pilot study introduces VR-CESM as a new tool in the cryospheric sciences, which could be used to dynamically downscale SMB in scenario simulations and to force dynamical ice sheet models through the CESM coupling framework. Text Greenland Ice Sheet Copernicus Publications: E-Journals Greenland The Cryosphere 13 6 1547 1564 |
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Open Polar |
collection |
Copernicus Publications: E-Journals |
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ftcopernicus |
language |
English |
description |
In this study, the resolution dependence of the simulated Greenland ice sheet surface mass balance (GrIS SMB) in the variable-resolution Community Earth System Model (VR-CESM) is investigated. Coupled atmosphere–land simulations are performed on two regionally refined grids over Greenland at 0.5 ∘ ( ∼55 km) and 0.25 ∘ ( ∼28 km), maintaining a quasi-uniform resolution of 1 ∘ ( ∼111 km) over the rest of the globe. On the refined grids, the SMB in the accumulation zone is significantly improved compared to airborne radar and in situ observations, with a general wetting (more snowfall) at the margins and a drying (less snowfall) in the interior GrIS. Total GrIS precipitation decreases with resolution, which is in line with best-available regional climate model results. In the ablation zone, CESM starts developing a positive SMB bias with increased resolution in some basins, notably in the east and the north. The mismatch in ablation is linked to changes in cloud cover in VR-CESM, and a reduced effectiveness of the elevation classes subgrid parametrization in CESM. Overall, our pilot study introduces VR-CESM as a new tool in the cryospheric sciences, which could be used to dynamically downscale SMB in scenario simulations and to force dynamical ice sheet models through the CESM coupling framework. |
format |
Text |
author |
Kampenhout, Leonardus Rhoades, Alan M. Herrington, Adam R. Zarzycki, Colin M. Lenaerts, Jan T. M. Sacks, William J. Broeke, Michiel R. |
spellingShingle |
Kampenhout, Leonardus Rhoades, Alan M. Herrington, Adam R. Zarzycki, Colin M. Lenaerts, Jan T. M. Sacks, William J. Broeke, Michiel R. Regional grid refinement in an Earth system model: impacts on the simulated Greenland surface mass balance |
author_facet |
Kampenhout, Leonardus Rhoades, Alan M. Herrington, Adam R. Zarzycki, Colin M. Lenaerts, Jan T. M. Sacks, William J. Broeke, Michiel R. |
author_sort |
Kampenhout, Leonardus |
title |
Regional grid refinement in an Earth system model: impacts on the simulated Greenland surface mass balance |
title_short |
Regional grid refinement in an Earth system model: impacts on the simulated Greenland surface mass balance |
title_full |
Regional grid refinement in an Earth system model: impacts on the simulated Greenland surface mass balance |
title_fullStr |
Regional grid refinement in an Earth system model: impacts on the simulated Greenland surface mass balance |
title_full_unstemmed |
Regional grid refinement in an Earth system model: impacts on the simulated Greenland surface mass balance |
title_sort |
regional grid refinement in an earth system model: impacts on the simulated greenland surface mass balance |
publishDate |
2019 |
url |
https://doi.org/10.5194/tc-13-1547-2019 https://tc.copernicus.org/articles/13/1547/2019/ |
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-13-1547-2019 https://tc.copernicus.org/articles/13/1547/2019/ |
op_doi |
https://doi.org/10.5194/tc-13-1547-2019 |
container_title |
The Cryosphere |
container_volume |
13 |
container_issue |
6 |
container_start_page |
1547 |
op_container_end_page |
1564 |
_version_ |
1766016050549227520 |