Articles | Volume 19, issue 2
https://doi.org/10.5194/gmd-19-595-2026
https://doi.org/10.5194/gmd-19-595-2026
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

Related authors

Glaciogenic seeding-induced hole-punch clouds and their sensitivity to the clouds' background state
Nadja Omanovic, Debora Bötticher, Christopher Fuchs, and Ulrike Lohmann
EGUsphere, https://doi.org/10.5194/egusphere-2025-5916,https://doi.org/10.5194/egusphere-2025-5916, 2025
This preprint is open for discussion and under review for Atmospheric Chemistry and Physics (ACP).
Short summary
Impact of seeder-feeder cloud interaction on precipitation formation: a case study based on extensive remote-sensing, in situ and model data
Kevin Ohneiser, Patric Seifert, Willi Schimmel, Fabian Senf, Tom Gaudek, Martin Radenz, Audrey Teisseire, Veronika Ettrichrätz, Teresa Vogl, Nina Maherndl, Nils Pfeifer, Jan Henneberger, Anna J. Miller, Nadja Omanovic, Christopher Fuchs, Huiying Zhang, Fabiola Ramelli, Robert Spirig, Anton Kötsche, Heike Kalesse-Los, Maximilian Maahn, Heather Corden, Alexis Berne, Majid Hajipour, Hannes Griesche, Julian Hofer, Ronny Engelmann, Annett Skupin, Albert Ansmann, and Holger Baars
Atmos. Chem. Phys., 25, 17363–17386, https://doi.org/10.5194/acp-25-17363-2025,https://doi.org/10.5194/acp-25-17363-2025, 2025
Short summary
Quantifying ice crystal growth rates in natural clouds from glaciogenic cloud seeding experiments
Christopher Fuchs, Fabiola Ramelli, Anna J. Miller, Nadja Omanovic, Robert Spirig, Huiying Zhang, Patric Seifert, Kevin Ohneiser, Ulrike Lohmann, and Jan Henneberger
Atmos. Chem. Phys., 25, 12177–12196, https://doi.org/10.5194/acp-25-12177-2025,https://doi.org/10.5194/acp-25-12177-2025, 2025
Short summary
Inferring the Controlling Factors of Ice Aggregation from Targeted Cloud Seeding Experiments
Huiying Zhang, Fabiola Ramelli, Christopher Fuchs, Nadja Omanovic, Anna J. Miller, Robert Spirig, Zhaolong Wu, Yunpei Chu, Xia Li, Ulrike Lohmann, and Jan Henneberger
EGUsphere, https://doi.org/10.5194/egusphere-2025-4397,https://doi.org/10.5194/egusphere-2025-4397, 2025
Short summary
Quantified ice-nucleating ability of AgI-containing seeding particles in natural clouds
Anna J. Miller, Christopher Fuchs, Fabiola Ramelli, Huiying Zhang, Nadja Omanovic, Robert Spirig, Claudia Marcolli, Zamin A. Kanji, Ulrike Lohmann, and Jan Henneberger
Atmos. Chem. Phys., 25, 5387–5407, https://doi.org/10.5194/acp-25-5387-2025,https://doi.org/10.5194/acp-25-5387-2025, 2025
Short summary

Cited articles

Ban, N., Schmidli, J., and Schär, C.: Heavy precipitation in a changing climate: Does short-term summer precipitation increase faster?, Geophysical Research Letters, 42, 1165–1172, https://doi.org/10.1002/2014GL062588, 2015. a
Barrett, A. I., Wellmann, C., Seifert, A., Hoose, C., Vogel, B., and Kunz, M.: One Step at a Time: How Model Time Step Significantly Affects Convection-Permitting Simulations, Journal of Advances in Modeling Earth Systems, 11, 641–658, https://doi.org/10.1029/2018MS001418, 2019. a
Bauer, P., Thorpe, A., and Brunet, G.: The quiet revolution of numerical weather prediction, Nature, 525, 47–55, https://doi.org/10.1038/nature14956, 2015. a
Blahak, U.: Towards a better representation of high density ice particles in a state-of-the-art two-moment bulk microphysical scheme, in: Proc. 15th Int. Conf. Clouds and Precip., vol. 20208, Cancun, Mexico, https://api.semanticscholar.org/CorpusID:201686126 (last access; 14 January 2026), 2008. a, b
Blahak, U.: New implementation of explicit hydrometeor sedimentation in the Seifert-Beheng 2-moment bulk microphysical scheme, https://www.cosmo-model.org/content/model/documentation/core/docu_sedi_twomom.pdf (last access: 7 May 2025), 2020. a, b
Download
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.
Share