Articles | Volume 22, issue 1
https://doi.org/10.5194/bg-22-103-2025
https://doi.org/10.5194/bg-22-103-2025
Research article
 | 
09 Jan 2025
Research article |  | 09 Jan 2025

Aggregation of ice-nucleating macromolecules from Betula pendula pollen determines ice nucleation efficiency

Florian Wieland, Nadine Bothen, Ralph Schwidetzky, Teresa M. Seifried, Paul Bieber, Ulrich Pöschl, Konrad Meister, Mischa Bonn, Janine Fröhlich-Nowoisky, and Hinrich Grothe

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Latest update: 01 May 2025
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Short summary
Betula pendula is a widespread birch tree species containing ice nucleation agents that can trigger the freezing of cloud droplets and thereby alter the evolution of clouds. Our study identifies three distinct ice-nucleating macromolecule (INM) aggregates of varying size that can nucleate ice at temperatures up to –5.4°C. Our findings suggest that these vegetation-derived particles may influence atmospheric processes, weather, and climate more strongly than previously thought.
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