ACP Atmospheric Chemistry and Physics ACP 1680-7324 Copernicus GmbH Göttingen, Germany 10.5194/acp-11-7839-2011 Surface modification of mineral dust particles by sulphuric acid processing: implications for ice nucleation abilities Reitz P. 1 2 Spindler C. 3 Mentel T. F. 3 Poulain L. 4 Wex H. 4 Mildenberger K. 4 Niedermeier D. 4 Hartmann S. 4 Clauss T. 4 Stratmann F. 4 Sullivan R. C. 5 DeMott P. J. 5 Petters M. D. 6 Sierau B. 7 Schneider J. 1 Particle Chemistry Department, Max Planck Institute for Chemistry, Mainz, Germany Institute for Atmospheric Physics, Johannes Gutenberg University Mainz, Mainz, Germany Institute for Energy- and Climate Research Troposphere (IEK-8), Research Center Jülich GmbH, Jülich, Germany Department of Physics, Leibniz Institute for Tropospheric Research, Leipzig, Germany Department of Atmospheric Science, Colorado State University, Fort Collins, USA Department of Marine Earth and Atmospheric Science, North Carolina State University, Raleigh, USA Institute for Atmospheric and Climate Science, ETH Zürich, Zürich, Switzerland 03 08 2011 11 15 7839 7858 This is an open-access article ditributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited. This article is available from http://www.atmos-chem-phys.net/11/7839/2011/acp-11-7839-2011.html The full text article is available as a PDF file from http://www.atmos-chem-phys.net/11/7839/2011/acp-11-7839-2011.pdf

The ability of coated mineral dust particles to act as ice nuclei (IN) was investigated at LACIS (Leipzig Aerosol Cloud Interaction Simulator) during the FROST1- and FROST2-campaigns (<b>Fr</b>eezing <b>o</b>f du<b>st</b>). Sulphuric acid was condensed on the particles which afterwards were optionally humidified, treated with ammonia vapour and/or heat. By means of aerosol mass spectrometry we found evidence that processing of mineral dust particles with sulphuric acid leads to surface modifications of the particles. These surface modifications are most likely responsible for the observed reduction of the IN activation of the particles. The observed particle mass spectra suggest that different treatments lead to different chemical reactions on the particle surface. Possible chemical reaction pathways and products are suggested and the implications on the IN efficiency of the treated dust particles are discussed.

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