Atmospheric Chemistry and Physics Discussions www.atmos-chem-phys-discuss.net 1680-7367 1680-7375 9 3 2009 10.5194/acpd-9-11299-2009 http://www.atmos-chem-phys-discuss.net/9/11299/2009/ http://www.atmos-chem-phys-discuss.net/9/11299/2009/acpd-9-11299-2009.html http://www.atmos-chem-phys-discuss.net/9/11299/2009/acpd-9-11299-2009.pdf 11299 11332 2009-05-06 Ice nucleation properties of mineral dust particles: Determination of onset RH_i, IN active fraction, nucleation time-lag, and the effect of active sites on contact angles G. Kulkarni gourihar.kulkarni@pnl.gov S. Dobbie School of Earth and Environment, University of Leeds, Leeds, UK now at: Atmospheric Science and Global Change Division, Pacific Northwest National Laboratory, Richland, WA, USA A newly developed ice nucleation experimental set up was used to investigate the heterogeneous ice nucleation properties of three Saharan and one Spanish dust particle samples. It was observed that the spread in the onset relative humidities with respect to ice (RH_i) for Saharan dust particles varied from 104% to 110%, whereas for the Spanish dust from 106% to 110%. The elemental composition analysis shows a prominent Ca feature in the Spanish dust sample which could potentially explain the differences in nucleation threshold. Although the spread in the onset RH_i) for the Saharan dust samples were in agreement, the active fractions and nucleation time-lags calculated at various temperature and RH_i) conditions were found to differ. This could be due to the subtle variation in the elemental composition of the dust samples, and surface irregularities like steps, cracks, cavities etc. A combination of classical nucleation theory and active site theory is used to understand the importance of these surface irregularities on the nucleability parameter contact angle that is widely used in the ice cloud modeling. 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