ACP Atmospheric Chemistry and Physics ACP 1680-7324 Copernicus GmbH Göttingen, Germany 10.5194/acp-4-1997-2004 Laboratory evidence for volume-dominated nucleation of ice in supercooled water microdroplets Duft D. 1 Leisner T. 1 Institut für Physik, Technische Universität Ilmenau, 98684 Ilmenau, Germany 04 10 2004 4 7 1997 2000 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/4/1997/2004/acp-4-1997-2004.html The full text article is available as a PDF file from http://www.atmos-chem-phys.net/4/1997/2004/acp-4-1997-2004.pdf

We report on measurements of the rate of homogeneous ice nucleation in supercooled water microdroplets levitated in an electrodynamic balance. By comparison of the freezing probability for droplets of radius 49µm and 19µm, we are able to conclude that homogeneous freezing is a volume-proportional process and that surface nucleation might only be important, if at all, for much smaller droplets.