Articles | Volume 18, issue 21
Atmos. Chem. Phys., 18, 16063–16079, 2018
https://doi.org/10.5194/acp-18-16063-2018
Atmos. Chem. Phys., 18, 16063–16079, 2018
https://doi.org/10.5194/acp-18-16063-2018

Research article 08 Nov 2018

Research article | 08 Nov 2018

Birch leaves and branches as a source of ice-nucleating macromolecules

Laura Felgitsch et al.

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Birch trees are possible sources of ice-nucleating macromolecules (INM). Pollen of birch trees are known to be ice nucleation active and were recently shown to release INM. For our work we examined 30 samples of birch branches, consisting of leaves, secondary wood (brown with no photosynthetic activity), and primary wood (green, photosynthetically active). The samples were milled and extracted aqueously. All samples contained INM. Most samples froze at temperatures comparable to birch pollen.
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