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Regional grid refinement in an Earth system model: impacts on the simulated Greenland surface mass balance

Journal Article · · The Cryosphere (Online)
 [1];  [2];  [3];  [4];  [5];  [4];  [1]
  1. Utrecht Univ., Utrecht (The Netherlands)
  2. Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
  3. Stony Brook Univ., Stony Brook, NY (United States)
  4. National Center for Atmospheric Research, Boulder, CO (United States)
  5. 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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Cited By (5)

Observing and Modeling Ice Sheet Surface Mass Balance journal June 2019
Surface mass balance downscaling through elevation classes in an Earth system model: application to the Greenland ice sheet journal January 2019
Brief communication: CESM2 climate forcing (1950–2014) yields realistic Greenland ice sheet surface mass balance journal April 2020
Brief communication: Evaluation of the near-surface climate in ERA5 over the Greenland Ice Sheet journal January 2020
Analysis of the surface mass balance for deglacial climate simulations journal March 2021


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