ACP Atmospheric Chemistry and Physics ACP Atmos. Chem. Phys. 1680-7324 Copernicus Publications Göttingen, Germany 10.5194/acp-14-5529-2014 Kaolinite particles as ice nuclei: learning from the use of different kaolinite samples and different coatings Wex H. https://orcid.org/0000-0003-2129-9323 1 DeMott P. J. https://orcid.org/0000-0002-3719-1889 2 Tobo Y. https://orcid.org/0000-0003-0951-3315 2 Hartmann S. https://orcid.org/0000-0002-9556-2772 1 Rösch M. 1 Clauss T. 1 Tomsche L. 1 Niedermeier D. https://orcid.org/0000-0002-8265-6235 1 Stratmann F. 1 Leibniz Institute for Tropospheric Research, Leipzig, Germany Department of Atmospheric Science, Colorado State University, Fort Collins, Colorado, USA 04 06 2014 14 11 5529 5546 Copyright: © 2014 H. Wex et al. 2014 This work is licensed under the Creative Commons Attribution 3.0 Unported License. To view a copy of this licence, visit https://creativecommons.org/licenses/by/3.0/ This article is available from https://acp.copernicus.org/articles/14/5529/2014/acp-14-5529-2014.html The full text article is available as a PDF file from https://acp.copernicus.org/articles/14/5529/2014/acp-14-5529-2014.pdf

Kaolinite particles from two different sources (Fluka and Clay Minerals Society (CMS)) were examined with respect to their ability to act as ice nuclei (IN). This was done in the water-subsaturated regime where often deposition ice nucleation is assumed to occur, and for water-supersaturated conditions, i.e., in the immersion freezing mode. Measurements were done using a flow tube (the Leipzig Aerosol Cloud Interaction Simulator, LACIS) and a continuous-flow diffusion chamber (CFDC). Pure and coated particles were used, with coating thicknesses of a few nanometers or less, where the coating consisted of levoglucosan, succinic acid or sulfuric acid. In general, it was found that the coatings strongly reduced deposition ice nucleation. Remaining ice formation in the water-subsaturated regime could be attributed to immersion freezing, with particles immersed in concentrated solutions formed by the coatings. <br><br> In the immersion freezing mode, ice nucleation rate coefficients <i>j</i><sub>het</sub> from both instruments agreed well with each other, particularly when the residence times in the instruments were accounted for. Fluka kaolinite particles coated with either levoglucosan or succinic acid showed the same IN activity as pure Fluka kaolinite particles; i.e., it can be assumed that these two types of coating did not alter the ice-active surface chemically, and that the coatings were diluted enough in the droplets that were formed prior to the ice nucleation, so that freezing point depression was negligible. However, Fluka kaolinite particles, which were either coated with pure sulfuric acid or were first coated with the acid and then exposed to additional water vapor, both showed a reduced ability to nucleate ice compared to the pure particles. For the CMS kaolinite particles, the ability to nucleate ice in the immersion freezing mode was similar for all examined particles, i.e., for the pure ones and the ones with the different types of coating. Moreover, <i>j</i><sub>het</sub> derived for the CMS kaolinite particles was comparable to <i>j</i><sub>het</sub> derived for Fluka kaolinite particles coated with sulfuric acid. This is suggestive for the Fluka kaolinite possessing a type of ice-nucleating surface feature which is not present on the CMS kaolinite, and which can be destroyed by reaction with sulfuric acid. This might be potassium feldspar.

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