Multirotor UAV icing correlated to liquid water content measurements in natural supercooled clouds

Miller, Anna J.; Fuchs, Christopher; Omanovic, Nadja; Ramelli, Fabiola; Seifert, Patric; Spirig, Robert; Zhang, Huiying; Fons, Emilie; Lohmann, Ulrike; Henneberger, Jan

doi:10.1016/j.coldregions.2024.104262

Cold Regions Science and Technology

2024

DOI: 10.1016/j.coldregions.2024.104262

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Multirotor UAV icing correlated to liquid water content measurements in natural supercooled clouds

Anna J. Miller,

Christopher Fuchs,

Nadja Omanovic

et al.

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Repurposing weather modification for cloud research showcased by ice crystal growth

Ramelli,

Henneberger,

Fuchs

et al. 2024

PNAS Nexus

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The representation of cloud processes in models is one of the largest sources of uncertainty in weather forecast and climate projections. While laboratory settings offer controlled conditions for studying cloud processes, they cannot reproduce the full range of conditions and interactions present in natural cloud systems. To bridge this gap, here we leverage weather modification, specifically glaciogenic cloud seeding, to investigate ice growth rates within natural clouds. Seeding experiments were conducted in supercooled stratus clouds (at −8 to −5 °C) using an uncrewed aerial vehicle, and the created ice crystals were measured 4-10 min downwind by in situ and ground-based remote sensing instrumentation. We observed substantial variability in ice crystal growth rates within natural clouds, attributed to variations in ice crystal number concentrations and in the supersaturation, which is difficult to reproduce in the laboratory and which implies faster precipitation initiation than previously thought. We found that for the experiments conducted at −5.2 °C, the ice crystal populations grew nearly linearly during the time interval from 6 to 10 minutes. Our results demonstrate that the targeted use of weather modification techniques can be employed for fundamental cloud research (e.g., ice growth processes, aerosol-cloud interactions), helping to advance cloud microphysics parameterizations and to improve weather forecasts and climate projections.

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Repurposing weather modification for cloud research showcased by ice crystal growth

Ramelli,

Henneberger,

Fuchs

et al. 2024

PNAS Nexus

View full text Add to dashboard Cite

show abstract

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Multirotor UAV icing correlated to liquid water content measurements in natural supercooled clouds

Cited by 1 publication

References 47 publications

Repurposing weather modification for cloud research showcased by ice crystal growth

Repurposing weather modification for cloud research showcased by ice crystal growth

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