Atmos. Chem. Phys. Discuss., 9, 11299-11332, 2009
www.atmos-chem-phys-discuss.net/9/11299/2009/
doi:10.5194/acpd-9-11299-2009
© Author(s) 2009. This work is distributed
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This discussion paper has been under review for the journal Atmospheric Chemistry and Physics (ACP). Please refer to the corresponding final paper in ACP.
Ice nucleation properties of mineral dust particles: Determination of onset RHi, IN active fraction, nucleation time-lag, and the effect of active sites on contact angles
G. Kulkarni1,* and S. Dobbie1
1School of Earth and Environment, University of Leeds, Leeds, UK
*now at: Atmospheric Science and Global Change Division, Pacific Northwest National Laboratory, Richland, WA, USA

Abstract. 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 (RHi) 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 RHi) for the Saharan dust samples were in agreement, the active fractions and nucleation time-lags calculated at various temperature and RHi) 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. These calculations show that the surface irregularities can reduce the contact angle by approximately 10°.

Citation: Kulkarni, G. and Dobbie, S.: Ice nucleation properties of mineral dust particles: Determination of onset RHi, IN active fraction, nucleation time-lag, and the effect of active sites on contact angles, Atmos. Chem. Phys. Discuss., 9, 11299-11332, doi:10.5194/acpd-9-11299-2009, 2009.
 
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