Geoscientific Model Development
Geoscientific Model Development
GMD
Articles | Volume 19, issue 2
Articles | Volume 19, issue 2
https://doi.org/10.5194/gmd-19-595-2026
© Author(s) 2026. This work is distributed under
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/gmd-19-595-2026
© Author(s) 2026. This work is distributed under
the Creative Commons Attribution 4.0 License.
Articles | Volume 19, issue 2
Model evaluation paper
 | 
19 Jan 2026
Model evaluation paper |  | 19 Jan 2026

Evaluation of semi-implicit and explicit sedimentation approaches in the two-moment cloud microphysics scheme of ICON

Simon Bolt and Nadja Omanovic

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Short summary
We examined the two-moment cloud microphysics sedimentation schemes of the ICON (ICOsahedral Nonhydrostatic) weather model, comparing the default semi-implicit with an explicit method faster on graphics processing units. Using idealized setups and thunderstorm case studies, we find differences in numerical diffusion and extreme precipitation rates due to changed coupling with the remaining microphysics. Neither method develops alarming instabilities in full model setups; both can be safely used.
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