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Overview of the CLOUDLAB project: Studying microphysical ice processes by seeding supercooled stratus clouds with a UAV

Authors

Henneberger,  Jan
IUGG 2023, General Assemblies, 1 General, International Union of Geodesy and Geophysics (IUGG), External Organizations;

Ramelli,  Fabiola
IUGG 2023, General Assemblies, 1 General, International Union of Geodesy and Geophysics (IUGG), External Organizations;

Spirig,  Robert
IUGG 2023, General Assemblies, 1 General, International Union of Geodesy and Geophysics (IUGG), External Organizations;

Fuchs,  Christopher
IUGG 2023, General Assemblies, 1 General, International Union of Geodesy and Geophysics (IUGG), External Organizations;

Hervo,  Maxime
IUGG 2023, General Assemblies, 1 General, International Union of Geodesy and Geophysics (IUGG), External Organizations;

Miller,  Anna
IUGG 2023, General Assemblies, 1 General, International Union of Geodesy and Geophysics (IUGG), External Organizations;

Ohneiser,  Kevin
IUGG 2023, General Assemblies, 1 General, International Union of Geodesy and Geophysics (IUGG), External Organizations;

Omanovic,  Nadja
IUGG 2023, General Assemblies, 1 General, International Union of Geodesy and Geophysics (IUGG), External Organizations;

Rösch,  Michael
IUGG 2023, General Assemblies, 1 General, International Union of Geodesy and Geophysics (IUGG), External Organizations;

Seifert,  Patric
IUGG 2023, General Assemblies, 1 General, International Union of Geodesy and Geophysics (IUGG), External Organizations;

Zhang,  Huiying
IUGG 2023, General Assemblies, 1 General, International Union of Geodesy and Geophysics (IUGG), External Organizations;

Lohmann,  Ulrike
IUGG 2023, General Assemblies, 1 General, International Union of Geodesy and Geophysics (IUGG), External Organizations;

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Citation

Henneberger, J., Ramelli, F., Spirig, R., Fuchs, C., Hervo, M., Miller, A., Ohneiser, K., Omanovic, N., Rösch, M., Seifert, P., Zhang, H., Lohmann, U. (2023): Overview of the CLOUDLAB project: Studying microphysical ice processes by seeding supercooled stratus clouds with a UAV, XXVIII General Assembly of the International Union of Geodesy and Geophysics (IUGG) (Berlin 2023).
https://doi.org/10.57757/IUGG23-2259


Cite as: https://gfzpublic.gfz-potsdam.de/pubman/item/item_5018529
Abstract
Ice formation and growth play a critical role in the initiation of precipitation. However, fundamental knowledge gaps in microphysical processes exist, for example, in the efficiency of diffusional growth of ice crystals, which leads to uncertainties in weather forecasts and climate projections. The CLOUDLAB project aims to bridge this gap by using supercooled stratus clouds as a natural laboratory for glaciogenic cloud seeding experiments. Ice nucleating particles (particles containing mainly silver iodide) are dispersed into these clouds via an Uncrewed Aerial Vehicle (UAV), triggering ice crystal formation and growth. The use of a UAV for seeding in conjunction with the persistent nature of stratus clouds enables repeated seeding experiments under similar and well-constrained initial conditions. So far, 50 seeding experiments with seeding temperatures between -10°C and -3°C were conducted in clouds over the Swiss plateau. The seeding-induced microphysical changes were monitored using in-situ and ground-based remote sensing equipment positioned 3-15 minutes downstream of the seeding location. The seeding plume had an extent of multiple hundreds of metres and was detected by increased reflectivity in the vertically pointing and scanning cloud radars (additional instrumentation was provided by TROPOS in the frame of the accompanying PolarCAP project). Simultaneously, high concentrations of small ice crystals were detected with a holographic imager mounted on a tethered balloon. The findings are contextualized with simulations using the numerical weather model (ICON).