Regional grid refinement in an Earth system model: impacts on the simulated Greenland surface mass balance
Journal Article
·
· The Cryosphere (Online)
- Utrecht Univ., Utrecht (The Netherlands)
- Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
- Stony Brook Univ., Stony Brook, NY (United States)
- National Center for Atmospheric Research, Boulder, CO (United States)
- Univ. of Colorado, Boulder, CO (United States)
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.
- Research Organization:
- Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States)
- Sponsoring Organization:
- USDOE Office of Science (SC), Biological and Environmental Research (BER) (SC-23). Climate and Environmental Sciences Division
- Grant/Contract Number:
- AC02-05CH11231
- OSTI ID:
- 1542412
- Journal Information:
- The Cryosphere (Online), Journal Name: The Cryosphere (Online) Journal Issue: 6 Vol. 13; ISSN 1994-0424
- Publisher:
- European Geosciences UnionCopyright Statement
- Country of Publication:
- United States
- Language:
- English
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