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Title: Ice Nucleation of Bare and Sulfuric Acid-coated Mineral Dust Particles and Implication for Cloud Properties

Abstract

Ice nucleation properties of different dust species coated with soluble material are not well understood. We determined the ice nucleation ability of bare and sulfuric acid coated mineral dust particles as a function of temperature (-25 to -35 deg C) and relative humidity with respect to water (RHw). Five different mineral dust species: Arizona test dust (ATD), illite, montmorillonite, quartz and kaolinite were dry dispersed and size-selected at 150 nm and exposed to sulfuric acid vapors in the coating apparatus. The condensed sulfuric acid soluble mass fraction per particle was estimated from the cloud condensation nuclei activated fraction measurements. The fraction of dust particles nucleating ice at various temperatures and RHw was determined using a compact ice chamber. In water-subsaturated conditions, compared to bare dust particles, we found that only coated ATD particles showed suppression of ice nucleation ability while other four dust species did not showed the effect of coating on the fraction of particles nucleating ice. The results suggest that interactions between the dust surface and sulfuric acid vapor are important, such that interactions may or may not modify the surface via chemical reactions with sulfuric acid. At water-supersaturated conditions we did not observed the effect of coating,more » i.e. the bare and coated dust particles had similar ice nucleation behavior.« less

Authors:
; ; ; ;
Publication Date:
Research Org.:
Pacific Northwest National Lab. (PNNL), Richland, WA (United States)
Sponsoring Org.:
USDOE
OSTI Identifier:
1170078
Report Number(s):
PNNL-SA-94976
KP1701000
DOE Contract Number:
AC05-76RL01830
Resource Type:
Journal Article
Resource Relation:
Journal Name: Journal of Geophysical Research. D. (Atmospheres), 119(16):9993–10011
Country of Publication:
United States
Language:
English

Citation Formats

Kulkarni, Gourihar R., Sanders, Cassandra N., Zhang, Kai, Liu, Xiaohong, and Zhao, Chun. Ice Nucleation of Bare and Sulfuric Acid-coated Mineral Dust Particles and Implication for Cloud Properties. United States: N. p., 2014. Web. doi:10.1002/2014JD021567.
Kulkarni, Gourihar R., Sanders, Cassandra N., Zhang, Kai, Liu, Xiaohong, & Zhao, Chun. Ice Nucleation of Bare and Sulfuric Acid-coated Mineral Dust Particles and Implication for Cloud Properties. United States. doi:10.1002/2014JD021567.
Kulkarni, Gourihar R., Sanders, Cassandra N., Zhang, Kai, Liu, Xiaohong, and Zhao, Chun. Wed . "Ice Nucleation of Bare and Sulfuric Acid-coated Mineral Dust Particles and Implication for Cloud Properties". United States. doi:10.1002/2014JD021567.
@article{osti_1170078,
title = {Ice Nucleation of Bare and Sulfuric Acid-coated Mineral Dust Particles and Implication for Cloud Properties},
author = {Kulkarni, Gourihar R. and Sanders, Cassandra N. and Zhang, Kai and Liu, Xiaohong and Zhao, Chun},
abstractNote = {Ice nucleation properties of different dust species coated with soluble material are not well understood. We determined the ice nucleation ability of bare and sulfuric acid coated mineral dust particles as a function of temperature (-25 to -35 deg C) and relative humidity with respect to water (RHw). Five different mineral dust species: Arizona test dust (ATD), illite, montmorillonite, quartz and kaolinite were dry dispersed and size-selected at 150 nm and exposed to sulfuric acid vapors in the coating apparatus. The condensed sulfuric acid soluble mass fraction per particle was estimated from the cloud condensation nuclei activated fraction measurements. The fraction of dust particles nucleating ice at various temperatures and RHw was determined using a compact ice chamber. In water-subsaturated conditions, compared to bare dust particles, we found that only coated ATD particles showed suppression of ice nucleation ability while other four dust species did not showed the effect of coating on the fraction of particles nucleating ice. The results suggest that interactions between the dust surface and sulfuric acid vapor are important, such that interactions may or may not modify the surface via chemical reactions with sulfuric acid. At water-supersaturated conditions we did not observed the effect of coating, i.e. the bare and coated dust particles had similar ice nucleation behavior.},
doi = {10.1002/2014JD021567},
journal = {Journal of Geophysical Research. D. (Atmospheres), 119(16):9993–10011},
number = ,
volume = ,
place = {United States},
year = {Wed Aug 27 00:00:00 EDT 2014},
month = {Wed Aug 27 00:00:00 EDT 2014}
}