Articles | Volume 17, issue 14
https://doi.org/10.5194/gmd-17-5573-2024
https://doi.org/10.5194/gmd-17-5573-2024
Methods for assessment of models
 | 
24 Jul 2024
Methods for assessment of models |  | 24 Jul 2024

Reduced floating-point precision in regional climate simulations: an ensemble-based statistical verification

Hugo Banderier, Christian Zeman, David Leutwyler, Stefan Rüdisühli, and Christoph Schär

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Cited articles

Ackmann, J., Dueben, P. D., Palmer, T., and Smolarkiewicz, P. K.: Mixed-Precision for Linear Solvers in Global Geophysical Flows, J. Adv. Model. Earth Sy., 14, e2022MS003148, https://doi.org/10.1029/2022MS003148, 2022. a
Banderier, H.: Spatially averaged test results comparing SP and DP COSMO simulations, Zenodo [data set], https://doi.org/10.5281/zenodo.8399468, 2023a. a
Banderier, H.: hbanderier/cosmo-sp: v1.0.0-rc.1, Zenodo [code], https://doi.org/10.5281/zenodo.8398547, 2023b. a
Benjamini, Y. and Hochberg, Y.: Controlling the False Discovery Rate: A Practical and Powerful Approach to Multiple Testing, J. Roy. Stat. Soc. B Met., 57, 289–300, https://doi.org/10.1111/j.2517-6161.1995.tb02031.x, 1995. a
Brown, A., Milton, S., Cullen, M., Golding, B., Mitchell, J., and Shelly, A.: Unified Modeling and Prediction of Weather and Climate: A 25-Year Journey, B. Am. Meteorol. Soc., 93, 1865–1877, https://doi.org/10.1175/BAMS-D-12-00018.1, 2012. a
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Short summary
We investigate the effects of reduced-precision arithmetic in a state-of-the-art regional climate model by studying the results of 10-year-long simulations. After this time, the results of the reduced precision and the standard implementation are hardly different. This should encourage the use of reduced precision in climate models to exploit the speedup and memory savings it brings. The methodology used in this work can help researchers verify reduced-precision implementations of their model.
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