Articles | Volume 15, issue 8
The Cryosphere, 15, 3751–3784, 2021
https://doi.org/10.5194/tc-15-3751-2021

Special issue: The Ice Sheet Model Intercomparison Project for CMIP6...

The Cryosphere, 15, 3751–3784, 2021
https://doi.org/10.5194/tc-15-3751-2021

Research article 17 Aug 2021

Research article | 17 Aug 2021

What is the surface mass balance of Antarctica? An intercomparison of regional climate model estimates

Ruth Mottram et al.

Data sets

Atmospheric climate model output of the COSMO-CLM2 regional climate model hindcast run over Antarctica (1987-2016) (Version COSMO-CLM version 5.0_clm6 - Community Land Model version 4.5) N. Souverijns, A. Gossart, M. Demuzere, J. T. M. Lenaerts, B. Medley, I. V. Gorodetskaya, S. Vanden Broucke, and N. P. M van Lipzig https://doi.org/10.5281/zenodo.2539147

Atmospheric climate model output from the regional climate model HIRHAM5 forced with ERA-Interim for Antarctica R. Mottram and F. Boberg http://ensemblesrt3.dmi.dk/data/prudence/temp/RUM/HIRHAM/ANTARCTICA/ERAI/

Regional Surface Mass Balance of Antarctica (1981--2016) estimated from five high resolution Regional Climate Models (Version 1.0) [Data set] R. Mottram https://doi.org/10.5281/zenodo.4590263

MARv3.10 outputs: What is the Surface Mass Balance of Antarctica? An Intercomparison of Regional Climate Model Estimates C. Kittel, C. Amory, C. Agosta, and X. Fettweis https://doi.org/10.5281/zenodo.5195636

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Short summary
We compare the calculated surface mass budget (SMB) of Antarctica in five different regional climate models. On average ~ 2000 Gt of snow accumulates annually, but different models vary by ~ 10 %, a difference equivalent to ± 0.5 mm of global sea level rise. All models reproduce observed weather, but there are large differences in regional patterns of snowfall, especially in areas with very few observations, giving greater uncertainty in Antarctic mass budget than previously identified.