Articles | Volume 26, issue 8
https://doi.org/10.5194/acp-26-5213-2026
© Author(s) 2026. This work is distributed under
the Creative Commons Attribution 4.0 License.
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/acp-26-5213-2026
© Author(s) 2026. This work is distributed under
the Creative Commons Attribution 4.0 License.
the Creative Commons Attribution 4.0 License.
Lagrangian particle–based simulation of aerosol-dependent vertical variation of cloud microphysics in a laboratory convection cloud chamber
Inyeob La
CORRESPONDING AUTHOR
Climate and Environmental Research Institute, Korea Institute of Science and Technology, Seoul, Republic of Korea
present address: Graduate School of Information Science, University of Hyogo, Kobe, Japan
Wojciech W. Grabowski
MMM Laboratory, NSF National Center for Atmospheric Research, Boulder, CO, USA
Yongjoon Kim
Glocal M&S Co., Ltd., Seoul, South Korea
Sanggyeom Kim
Department of Atmospheric Sciences, Yonsei University, Seoul, Republic of Korea
Seong Soo Yum
CORRESPONDING AUTHOR
Climate and Environmental Research Institute, Korea Institute of Science and Technology, Seoul, Republic of Korea
Department of Atmospheric Sciences, Yonsei University, Seoul, Republic of Korea
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EGUsphere, https://doi.org/10.5194/egusphere-2026-842, https://doi.org/10.5194/egusphere-2026-842, 2026
This preprint is open for discussion and under review for Atmospheric Chemistry and Physics (ACP).
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Aerosols are tiny particles in the air, and some of them help form cloud droplets (called cloud condensation nuclei). Most ship measurements focus on only one ocean. To compare aerosols over several oceans, we measured them during a transit voyage of a research ship using the same method. The results show that properties of these particles cannot be represented by a single marine condition. Moreover, they changed widely, depending on where the air came from and the pathway it traveled.
Damian K. Wójcik, Michał Z. Ziemiański, and Wojciech W. Grabowski
Weather Clim. Dynam., 6, 1769–1795, https://doi.org/10.5194/wcd-6-1769-2025, https://doi.org/10.5194/wcd-6-1769-2025, 2025
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Representation of severe convection is a challenge for numerical weather prediction models. We show that an explicit stochastic convection initiation scheme, mimicking effects of initial convective cells, allows representation of the isolated bow echo, exposing its cold-pool-driven dynamics, formation of the rear inflow jet, and strong surface winds. The reconstruction delays the strongest gusts by almost an hour, and insufficiently represents continuous linear arrangement of convective cells.
Wojciech W. Grabowski and Hanna Pawlowska
Atmos. Chem. Phys., 25, 5273–5285, https://doi.org/10.5194/acp-25-5273-2025, https://doi.org/10.5194/acp-25-5273-2025, 2025
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A simple diagram to depict cloud droplets' formation via the activation of cloud condensation nuclei (CCN) as well as their subsequent growth and evaporation is presented.
Adam C. Varble, Adele L. Igel, Hugh Morrison, Wojciech W. Grabowski, and Zachary J. Lebo
Atmos. Chem. Phys., 23, 13791–13808, https://doi.org/10.5194/acp-23-13791-2023, https://doi.org/10.5194/acp-23-13791-2023, 2023
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As atmospheric particles called aerosols increase in number, the number of droplets in clouds tends to increase, which has been theorized to increase storm intensity. We critically evaluate the evidence for this theory, showing that flaws and limitations of previous studies coupled with unaddressed cloud process complexities draw it into question. We provide recommendations for future observations and modeling to overcome current uncertainties.
Istvan Geresdi, Lulin Xue, Sisi Chen, Youssef Wehbe, Roelof Bruintjes, Jared A. Lee, Roy M. Rasmussen, Wojciech W. Grabowski, Noemi Sarkadi, and Sarah A. Tessendorf
Atmos. Chem. Phys., 21, 16143–16159, https://doi.org/10.5194/acp-21-16143-2021, https://doi.org/10.5194/acp-21-16143-2021, 2021
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By releasing soluble aerosols into the convective clouds, cloud seeding potentially enhances rainfall. The seeding impacts are hard to quantify with observations only. Numerical models that represent the detailed physics of aerosols, cloud and rain formation are used to investigate the seeding impacts on rain enhancement under different natural aerosol backgrounds and using different seeding materials. Our results indicate that seeding may enhance rainfall under certain conditions.
Wojciech W. Grabowski and Hugh Morrison
Atmos. Chem. Phys., 21, 13997–14018, https://doi.org/10.5194/acp-21-13997-2021, https://doi.org/10.5194/acp-21-13997-2021, 2021
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The paper provides a discussion of key elements of moist convective dynamics: cloud buoyancy, latent heating, precipitation, and entrainment. The motivation comes from recent discussions concerning differences in convective dynamics in polluted and pristine environments.
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Short summary
We ask how the amount of aerosol particles shapes cloud structure. Using computer simulations of a laboratory cloud chamber, we varied aerosol levels and tracked droplet growth. When aerosols are few, cloud water increases with height; when many, it becomes almost uniform because vapor is used up near the bottom. These findings clarify when upward motions matter and guide chamber design and better cloud treatment in weather and climate models.
We ask how the amount of aerosol particles shapes cloud structure. Using computer simulations of...
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