Atmospheric Chemistry and Physics
www.atmos-chem-phys.net
1680-7316
1680-7324
9
18
2009
10.5194/acp-9-6705-2009
http://www.atmos-chem-phys.net/9/6705/2009/
http://www.atmos-chem-phys.net/9/6705/2009/acp-9-6705-2009.html
http://www.atmos-chem-phys.net/9/6705/2009/acp-9-6705-2009.pdf
6705
6715
2009-09-16
Influence of particle size on the ice nucleating ability of mineral dusts
A. Welti
andre.welti@env.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. 800 nm particles required the lowest RH<sub>i</sub> to activate.
Deposition nucleation below water saturation was found only below
−30°C or −35°C dependent on particle size. 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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