In:
Geophysical Research Letters, American Geophysical Union (AGU), Vol. 36, No. 2 ( 2009-01)
Abstract:
The onset conditions for ice nucleation on H 2 SO 4 coated, (NH 4 ) 2 SO 4 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 (RH i ) was below 110% at all temperatures studied, consistent with previous measurements. H 2 SO 4 coatings, however, drastically altered the ice nucleating ability of kaolinite particles, increasing the RH i required for ice nucleation by approximately 30%, similar to the recent measurements by Möhler et al. [2008b]. (NH 4 ) 2 SO 4 coated particles were poor ice nuclei at 245 K, but effective ice nuclei at 236 K. The differences between H 2 SO 4 and (NH 4 ) 2 SO 4 coatings may be explained by the deliquescence and efflorescence properties of (NH 4 ) 2 SO 4 . These results support the idea that emissions of SO 2 and NH 3 may influence the ice nucleating properties of mineral dust particles.
Type of Medium:
Online Resource
ISSN:
0094-8276
,
1944-8007
DOI:
10.1029/2008GL035997
Language:
English
Publisher:
American Geophysical Union (AGU)
Publication Date:
2009
detail.hit.zdb_id:
2021599-X
detail.hit.zdb_id:
7403-2
SSG:
16,13
