Atmospheric Chemistry and Physics www.atmos-chem-phys.net 1680-7316 1680-7324 6 10 2006 10.5194/acp-6-2991-2006 http://www.atmos-chem-phys.net/6/2991/2006/ http://www.atmos-chem-phys.net/6/2991/2006/acp-6-2991-2006.html http://www.atmos-chem-phys.net/6/2991/2006/acp-6-2991-2006.pdf 2991 3006 2006-07-21 Some ice nucleation characteristics of Asian and Saharan desert dust P. R. Field prfield@ucar.edu O. Möhler P. Connolly M. Krämer R. Cotton A. J. Heymsfield H. Saathoff M. Schnaiter Met Office, Exeter, UK Institute for Meteorology and Climate Research (IMK-AAF), Forschungszentrum Karlsruhe, Germany School of Earth, Atmospheric and Environmental Sciences, University of Manchester, Manchester, UK Institute of Chemistry and Dynamics of the Geosphere (ICG-I), Forschungszentrum Jülich, Germany NCAR, Boulder, CO, USA now at: NCAR, Boulder, CO, USA The large (7 m×4 m cylinder, 84 m³) AIDA (Aerosol Interactions and Dynamics in the Atmosphere) cloud chamber facility at Forschungszentrum, Karlsruhe, Germany was used to test the ice nucleating ability of two desert dust samples from the Sahara and Asia. Aerosol samples were lognormally distributed with a mode diameter of 0.4(±0.1) μm and geometric standard deviation of ~1.7(±0.2). At temperatures warmer than −40°C droplets were formed before ice crystals formed and there was generally no deposition nucleation observed. 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