Atmospheric Chemistry and Physics Discussions
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10.5194/acpd-9-6929-2009
http://www.atmos-chem-phys-discuss.net/9/6929/2009/
http://www.atmos-chem-phys-discuss.net/9/6929/2009/acpd-9-6929-2009.html
http://www.atmos-chem-phys-discuss.net/9/6929/2009/acpd-9-6929-2009.pdf
6929
6955
2009-03-16
Influence of particle size on the ice nucleating ability of mineral dusts
A. Welti
awelti@student.ethz.ch
F. Lüönd
O. Stetzer
U. Lohmann
ETH Zurich, Institute for Atmospheric and Climate Science, Switzerland
The recently developed Zurich Ice Nucleation Chamber (ZINC) was used to
explore ice nucleation of size-selected mineral dust particles at
temperatures between −20°C and −55°C. Four different mineral
dust species have been tested: montmorillonite, kaolinite, illite and Arizona
test dust (ATD). The selected particle diameters are 100 nm, 200 nm,
400 nm and 800 nm. Relative humidities with respect to ice (RH<sub>i</sub>)
required to activate 1% of the dust particles as ice nuclei (IN) are
reported as a function of temperature. An explicit size dependence of the ice
formation efficiency has been observed for all dust types. Deposition
nucleation was found only below −30°C or −35°C dependent on
particle size. 800 nm particles required the lowest RH<sub>i</sub> to
activate. Minimum RH<sub>i</sub> for 1% activation were 105% for illite,
kaolinite and montmorillonite at −40°C, respectively 110% for ATD
at −45°C. In addition, a possible parameterisation for the measured
activation spectra is proposed, which could be used in modeling studies.
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