References

ACP

Atmospheric Chemistry and Physics

ACP

1680-7324

Copernicus GmbH

Göttingen, Germany

10.5194/acp-6-3007-2006

Efficiency of the deposition mode ice nucleation on mineral dust particles

Möhler

¹ Field

P. R.

² ⁶ Connolly

³ Benz

¹ Saathoff

¹ Schnaiter

¹ Wagner

¹ Cotton

² Krämer

⁴ Mangold

⁴ ⁷ Heymsfield

A. J.

⁵

Institute for Meteorology and Climate Research, Forschungszentrum Karlsruhe, Germany

Met Office, Exeter, UK

School of Earth, Atmospheric and Environmental Sciences, University of Manchester, Manchester, UK

Institut für Chemie und Dynamik der Geosphäre (ICG-I), Forschungszentrum Jülich, Germany

National Center for Atmospheric Research (NCAR), Boulder, CO, USA

now at: National Center for Atmospheric Research (NCAR), Boulder, CO, USA

now at: Royal Meteorological Institute of Belgium, Brussels, Belgium

21 07 2006

6 10 3007 3021

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The deposition mode ice nucleation efficiency of various dust aerosols was investigated at cirrus cloud temperatures between 196 and 223 K using the aerosol and cloud chamber facility AIDA (Aerosol Interaction and Dynamics in the Atmosphere). Arizona test dust (ATD) as a reference material and two dust samples from the Takla Makan desert in Asia (AD1) and the Sahara (SD2) were used for the experiments at simulated cloud conditions. The dust particle sizes were almost lognormally distributed with mode diameters between 0.3 and 0.5 μm and geometric standard deviations between 1.6 and 1.9. Deposition ice nucleation was most efficient on ATD particles with ice-active particle fractions of about 0.6 and 0.8 at an ice saturation ratio Si<1.15 and temperatures of 223 and 209 K, respectively. No significant change of the ice nucleation efficiency was found in up to three subsequent cycles of ice activation and evaporation with the same ATD aerosol. This indicates that the phenomenon of preactivation does not apply to ATD particles. The desert dust samples SD2 and AD1 showed a significantly lower fraction of active deposition nuclei, about 0.25 at 223 K and Si<1.35. For all samples the ice activated aerosol fraction could be approximated by an exponential equation as function of Si. This indicates that deposition ice nucleation on mineral particles may not be treated in the same stochastic sense as homogeneous freezing. The suggested formulation of ice activation spectra may be used to calculate the formation rate of ice crystals in models, if the number concentration of dust particles is known. More experimental work is needed to quantify the variability of the ice activation spectra as function of the temperature and dust particle properties.

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