Go to  Advanced Search

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

Show full item record

Files in this item

Files Size Format Description   View
Bertram_2008GL035997.pdf 216.0Kb Adobe Portable Document Format   View/Open
 
Title: Effects of sulfuric acid and ammonium sulfate coatings on the ice nucleation properties of kaolinite particles.
Author: Eastwood, Michael L.; Cremel, Sebastien; Wheeler, Michael; Murray, Benjamin J.; Girard, Eric; Bertram, Allan K.
Issue Date: 2009-01
Publicly Available in cIRcle 2011-04-15
Publisher American Geophysical Union
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.
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.
Affiliation: Chemistry, Dept of
URI: http://hdl.handle.net/2429/33686
Peer Review Status: Reviewed
Scholarly Level: Faculty

This item appears in the following Collection(s)

Show full item record

All items in cIRcle are protected by copyright, with all rights reserved.

UBC Library
1961 East Mall
Vancouver, B.C.
Canada V6T 1Z1
Tel: 604-822-6375
Fax: 604-822-3893