The Arctic Low-Level Mixed-Phase Haze Regime and its Microphysical Differences to Mixed-Phase Clouds

Moser, Manuel; Voigt, Christiane; Eppers, Oliver; Lucke, Johannes; De La Torre Castro, Elena; Mayer, Johanna; Dupuy, Regis; Mioche, Guillaume; Jourdan, Olivier; Clemen, Hans-Christian; Schneider, Johannes; Joppe, Philipp; Mertes, Stephan; Wetzel, Bruno; Borrmann, Stephan; Klingebiel, Marcus; Mech, Mario; Lüpkes, Christof; Crewell, Susanne; Ehrlich, André; Herber, Andreas; Wendisch, Manfred

doi:10.5194/acp-26-1867-2026

Articles | Volume 26, issue 3

https://doi.org/10.5194/acp-26-1867-2026

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

Special issue:

HALO-(AC)³ – an airborne campaign to study air...

https://doi.org/10.5194/acp-26-1867-2026

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

Articles | Volume 26, issue 3

Research article

|

05 Feb 2026

Research article |

| 05 Feb 2026

The Arctic Low-Level Mixed-Phase Haze Regime and its Microphysical Differences to Mixed-Phase Clouds

Manuel Moser, Christiane Voigt, Oliver Eppers, Johannes Lucke, Elena De La Torre Castro, Johanna Mayer, Regis Dupuy, Guillaume Mioche, Olivier Jourdan, Hans-Christian Clemen, Johannes Schneider, Philipp Joppe, Stephan Mertes, Bruno Wetzel, Stephan Borrmann, Marcus Klingebiel, Mario Mech, Christof Lüpkes, Susanne Crewell, André Ehrlich, Andreas Herber, and Manfred Wendisch

Data sets

Aircraft-based measurement of particle size and chemical composition for individual aerosol particles during theHALO-(AC)^3 campaign 2022 O. Eppers et al. https://doi.org/10.1594/PANGAEA.963290

Airborne in-situ measurement of particle number concentration and size distribution using an optical particle counter during HALO-(AC)^3 O. Eppers et al. https://doi.org/10.1594/PANGAEA.963284

Dropsonde measurements from HALO and POLAR 5 during HALO-(AC)^3 in 2022 G. George et al. https://doi.org/10.1594/PANGAEA.968891

Airborne in-situ measurements of aerosol properties of cloud particle residuals / ambient particles and of the cloud water content / water vapor during the HALO-AC3 campaign in March and April 2022 S. Mertes and B. Wetzel https://doi.org/10.1594/PANGAEA.963771

DLR in situ cloud measurements during HALO-(AC)^3 Arctic airborne campaign M. Moser et al. https://doi.org/10.1594/PANGAEA.963247

Ac3airborne - Flight-Phase-Separation N. Risse et al. https://doi.org/10.5281/zenodo.7305558

Short summary

In this study we analyzed Arctic mixed-phase clouds using airborne in-situ measurements in spring 2022. Based on microphysical properties, we show that within these clouds a distinction must be made between classic mixed-phase clouds and a mixed-phase haze regime. Instead of supercooled droplets, the haze regime contains large wet sea salt aerosols. These findings improve our understanding of Arctic low-level cloud processes.