Atmospheric Chemistry and Physics www.atmos-chem-phys.net 1680-7316 1680-7324 10 5 2010 10.5194/acp-10-2307-2010 http://www.atmos-chem-phys.net/10/2307/2010/ http://www.atmos-chem-phys.net/10/2307/2010/acp-10-2307-2010.html http://www.atmos-chem-phys.net/10/2307/2010/acp-10-2307-2010.pdf 2307 2317 2010-03-05 Depositional ice nucleation on solid ammonium sulfate and glutaric acid particles K. J. Baustian M. E. Wise M. A. Tolbert margaret.tolbert@colorado.edu Cooperative Institute for Research in Environmental Sciences, University of Colorado, Boulder, Colorado, USA Department of Atmospheric and Oceanic Science, University of Colorado, Boulder, Colorado, USA Department of Chemistry and Biochemistry, University of Colorado, Boulder, Colorado, USA Heterogeneous ice nucleation on solid ammonium sulfate and glutaric acid particles was studied using optical microscopy and Raman spectroscopy. Optical microscopy was used to detect selective nucleation events as water vapor was slowly introduced into an environmental sample cell. Particles that nucleated ice were dried via sublimation and examined in detail using Raman spectroscopy. Depositional ice nucleation is highly selective and occurred preferentially on just a few ammonium sulfate and glutaric acid particles in each sample. For freezing temperatures between 214 K and 235 K an average ice saturation ratio of <i>S</i> = 1.10&plusmn;0.07 for solid ammonium sulfate was observed. Over the same temperature range, S values observed for ice nucleation on glutaric acid particles increased from 1.2 at 235 K to 1.6 at 218 K. Experiments with externally mixed particles further show that ammonium sulfate is a more potent ice nucleus than glutaric acid. 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