Influence of particle size on the ice nucleating ability of mineral dusts
| Autor: | Welti, André, Lüönd, Felix, Stetzer, Olaf, Lohmann, Ulrike |
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| Jazyk: | angličtina |
| Rok vydání: | 2009 |
| Zdroj: | Atmospheric Chemistry and Physics Discussions, 9 (2) |
| ISSN: | 1680-7375 1680-7367 |
| Popis: | The recently developed Zurich Ice Nucleation Chamber (ZINC) was used to explore icenucleation 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 100nm, 200nm,400 nm and 800nm. Relative humidities with respect to ice (RHi) required to activate1% 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 alldust types. Deposition nucleation was found only below−30◦C or−35◦C dependenton particle size. 800 nm particles required the lowest RHito activate. Minimum RHi for 1% activation were 105% for illite, kaolinite and montmorillonite at−40◦C, respectively110% for ATD at−45◦C. In addition, a possible parameterisation for the measuredactivation spectra is proposed, which could be used in modeling studies. Atmospheric Chemistry and Physics Discussions, 9 (2) ISSN:1680-7375 ISSN:1680-7367 |
| Databáze: | OpenAIRE |
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