Ice-nucleating particle depletion in the  wintertime boundary layer in the pre-Alpine region  during stratus cloud conditions

Ohneiser, Kevin; Hartmann, Markus; Wex, Heike; Seifert, Patric; Hardt, Anja; Miller, Anna; Baudrexl, Katharina; Thomas, Werner; Ettrichrätz, Veronika; Maahn, Maximilian; Gaudek, Tom; Schimmel, Willi; Senf, Fabian; Griesche, Hannes; Radenz, Martin; Henneberger, Jan

doi:10.5194/acp-26-3223-2026

Articles | Volume 26, issue 4

https://doi.org/10.5194/acp-26-3223-2026

© Author(s) 2026. This work is distributed under
the Creative Commons Attribution 4.0 License.

https://doi.org/10.5194/acp-26-3223-2026

© Author(s) 2026. This work is distributed under
the Creative Commons Attribution 4.0 License.

Articles | Volume 26, issue 4

Research article

|

03 Mar 2026

Research article |

| 03 Mar 2026

Ice-nucleating particle depletion in the wintertime boundary layer in the pre-Alpine region during stratus cloud conditions

Kevin Ohneiser, Markus Hartmann, Heike Wex, Patric Seifert, Anja Hardt, Anna Miller, Katharina Baudrexl, Werner Thomas, Veronika Ettrichrätz, Maximilian Maahn, Tom Gaudek, Willi Schimmel, Fabian Senf, Hannes Griesche, Martin Radenz, and Jan Henneberger

Supplement

https://doi.org/10.5194/acp-26-3223-2026-supplement

Data sets

Dataset: PolarCAP/CLOUDLAB campaign in Eriswil, Switzerland, data from the INP contrast study in January and February 2024 used in the publication in ACP: Ice-nucleating particle depletion in the wintertime boundary layer in the pre-Alpine region during stratus cloud conditions Kevin Ohneiser et al. https://doi.org/10.5281/zenodo.15721531

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Short summary

This study highlights the efficiency of supercooled liquid-dominated stratus clouds to remove ice-nucleating particles (INPs). When within the planetary boundary layer (PBL), lower concentrations of INPs were measured under supercooled stratus conditions, compared to when the stratus cloud layers occurred at temperatures above freezing. Under supercooling conditions, the free-troposphere above the supercooled stratus covered PBL was found to be an additional potential source of INP.