Articles | Volume 26, issue 11
https://doi.org/10.5194/acp-26-8001-2026
https://doi.org/10.5194/acp-26-8001-2026
Research article
 | 
10 Jun 2026
Research article |  | 10 Jun 2026

Quasi-Lagrangian observations of cloud transitions during the initial phase of marine cold air outbreaks in the Arctic – Part 2: Vertical cloud structure

Anna Weber, Fabian Hoffmann, and Bernhard Mayer

Data sets

Spectral radiance measurements with the hyperspectral and polarized imaging system specMACS during the HALO-(AC)3 field campaign A. Weber et al. https://doi.org/10.1594/PANGAEA.966992

Two-dimensional cloud-top and surface brightness temperature with 1 Hz temporal resolution derived at flight altitude from VELOX during the HALO-(AC)3 field campaign M. Schäfer et al. https://doi.org/10.1594/PANGAEA.963401

Dropsonde measurements from HALO and POLAR 5 during HALO-(AC)3 in 2022 (Level-3), PANGAEA, doi:10.1594/PANGAEA.968900, in: George, G et al. (2024): Dropsonde measurements from HALO and POLAR 5 during HALO-(AC)3 in 2022 G.George et al. https://doi.org/10.1594/PANGAEA.968891

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

Unified Airborne Active and Passive Microwave Measurements over Arctic Sea Ice and Ocean during the HALO-(AC)3 Campaign in Spring 2022 (v2.7) H. Dorff et al. https://doi.org/10.1594/PANGAEA.974108

Aircraft measurements of backscatter ratio, particle depolarization and water vapour molecular density profiles over Arctic sea ice and ocean during the HALO-(AC)3 campaign in spring 2022 M. Wirth and S. Groß https://doi.org/10.1594/PANGAEA.967086

Five-day backwards trajectories at one minute resolution along the flight tracks of the Polar 6 research aircraft during HALO-(AC)3 B. Kirbus and M. Wendisch https://doi.org/10.1594/PANGAEA.971921

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Short summary
The vertical evolution of microphysical cloud properties in low-level mixed-phase clouds during a marine cold air outbreak in the Arctic is analyzed based on measurements collected during the HALO–(𝒜𝒞)3 campaign. In particular, pseudo-vertical profiles of cloud thermodynamic phase and the cloud droplet size are constructed. The measured vertical profiles are compared to predictions from an entraining parcel model to investigate the influence of ice processes on supercooled liquid water droplets.
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