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Effects of sulfuric acid and ammonium sulfate coatings on the ice nucleation properties of kaolinite particles.

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dc.contributor.author Eastwood, Michael L.
dc.contributor.author Cremel, Sebastien
dc.contributor.author Wheeler, Michael
dc.contributor.author Murray, Benjamin J.
dc.contributor.author Girard, Eric
dc.contributor.author Bertram, Allan K.
dc.date.accessioned 2011-04-15T21:22:26Z
dc.date.available 2011-04-15T21:22:26Z
dc.date.issued 2009-01
dc.identifier.citation Eastwood, Michael L., Cremel, Sebastien, Wheeler, Michael, Murray, Benjamin J., Girard, Eric, Bertram, Allan K. 2009. Effects of sulfuric acid and ammonium sulfate coatings on the ice nucleation properties of kaolinite particles. Geophysical Research Letters 36(2) L02811/1-L02811/5 dx.doi.org/10.1029/2008GL035997. en
dc.identifier.uri http://hdl.handle.net/2429/33686
dc.description.abstract The onset conditions for ice nucleation on H2SO4 coated, (NH4)2SO4 coated, and uncoated kaolinite particles at temperatures ranging from 233 to 246 K were studied. We define the onset conditions as the relative humidity and temperature at which the first ice nucleation event was observed. Uncoated particles were excellent ice nuclei; the onset relative humidity with respect to ice (RHi) was below 110% at all temperatures studied, consistent with previous measurements. H2SO4 coatings, however, drastically altered the ice nucleating ability of kaolinite particles, increasing the RHi required for ice nucleation by approximately 30%, similar to the recent measurements by Möhler et al. [2008b]. (NH4)2SO4 coated particles were poor ice nuclei at 245 K, but effective ice nuclei at 236 K. The differences between H2SO4 and (NH4)2SO4 coatings may be explained by the deliquescence and efflorescence properties of (NH4)2SO4. These results support the idea that emissions of SO2 and NH3 may influence the ice nucleating properties of mineral dust particles. An edited version of this paper was published by AGU. Copyright 2009 American Geophysical Union. en
dc.language.iso eng en
dc.publisher American Geophysical Union en
dc.title Effects of sulfuric acid and ammonium sulfate coatings on the ice nucleation properties of kaolinite particles. en
dc.type text en
dc.type.text article en
dc.description.affiliation Chemistry, Dept of en
dc.description.reviewstatus Reviewed en
dc.rights.copyright Bertram, Allan K. en
dc.description.scholarlevel Faculty en


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