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The recently developed Zurich Ice Nucleation Chamber (ZINC) was used toexplore ice nucleation of size-selected mineral dust particles attemperatures between −20°C and −55°C. Four differentmineral dust species have been tested: montmorillonite, kaolinite, illite andArizona test dust (ATD). The selected particle diameters are 100 nm,200 nm, 400 nm and 800 nm. Relative humidities withrespect to ice (RHi) required to activate 1% of the dust particles asice nuclei (IN) are reported as a function of temperature. An explicit sizedependence of the ice formation efficiency has been observed for all dusttypes. 800 nm particles required the lowest RHi to activate.Deposition nucleation below water saturation was found only below−30°C or −35°C dependent on particle size. Minimum RHifor 1% activation were 105% for illite, kaolinite and montmorillonite at−40°C, respectively 110% for ATD at −45°C. In addition, apossible parameterisation for the measured activation spectra is proposed,which could be used in modeling studies

Influence of particle size on the ice nucleating ability of mineral dusts