ACP Atmospheric Chemistry and Physics ACP 1680-7324 Copernicus GmbH Göttingen, Germany 10.5194/acp-11-31-2011 Results from the University of Toronto continuous flow diffusion chamber at ICIS 2007: instrument intercomparison and ice onsets for different aerosol types Kanji Z. A. 1 4 DeMott P. J. 2 Möhler O. 3 Abbatt J. P. D. 1 University of Toronto, Department of Chemistry, Toronto, ON, Canada Colorado State University, Department of Atmospheric Science, Fort Collins, CO, USA Karlsruhe Institute of Technology, Institute for Meteorology and Climate Research, Karlsruhe, Germany now at: Institute for Atmospheric and Climate Science, ETH, Zurich, Switzerland 03 01 2011 11 1 31 41 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/11/31/2011/acp-11-31-2011.html The full text article is available as a PDF file from http://www.atmos-chem-phys.net/11/31/2011/acp-11-31-2011.pdf

The University of Toronto continuous flow diffusion chamber (UT-CFDC) was used to study heterogeneous ice nucleation at the International Workshop on Comparing Ice Nucleation Measuring Systems (ICIS 2007) which also represented the 4-th ice nucleation workshop, on 14–28 September 2007. One goal of the workshop was to inter-compare different ice nucleation measurement techniques using the same aerosol sample source and preparation method. The aerosol samples included four types of desert mineral dust, graphite soot particles, and live and dead bacterial cells (Snomax®). This paper focuses on the UT-CFDC results, with a comparison to techniques of established heritage including the Colorado State CFDC and the AIDA expansion chamber. Good agreement was found between the different instruments with a few specific differences, especially at low temperatures, perhaps due to the variation in how onset of ice formation is defined between the instruments and the different inherent residence times. It was found that when efficiency of ice formation is based on the lowest onset relative humidity, Snomax® particles were most efficient followed by the desert dusts and then soot. For all aerosols, deposition mode freezing was only observed for <i>T</i><45 K except for the dead bacteria where freezing occurred below water saturation as warm as 263 K.

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