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CCN activity and volatility of beta-caryophyllene secondary organic aerosol

Frosch, Mia LU ; Bilde, M.; Nenes, A.; Praplan, A. P.; Juranyi, Z.; Dommen, J.; Gysel, M.; Weingartner, E. and Baltensperger, U. (2013) In Atmospheric Chemistry and Physics 13(4). p.2283-2297
Abstract
In a series of smog chamber experiments, the cloud condensation nuclei (CCN) activity of secondary organic aerosol (SOA) generated from ozonolysis of beta-caryophyllene was characterized by determining the CCN derived hygroscopicity parameter, kappa(CCN), from experimental data. Two types of CCN counters, operating at different temperatures, were used. The effect of semi-volatile organic compounds on the CCN activity of SOA was studied using a thermodenuder. Overall, SOA was only slightly CCN active (with kappa(CCN) in the range 0.001-0.16), and in dark experiments with no OH scavenger present, kappa(CCN) decreased when particles were sent through the thermodenuder (with a temperature up to 50 degrees C). SOA was generated under different... (More)
In a series of smog chamber experiments, the cloud condensation nuclei (CCN) activity of secondary organic aerosol (SOA) generated from ozonolysis of beta-caryophyllene was characterized by determining the CCN derived hygroscopicity parameter, kappa(CCN), from experimental data. Two types of CCN counters, operating at different temperatures, were used. The effect of semi-volatile organic compounds on the CCN activity of SOA was studied using a thermodenuder. Overall, SOA was only slightly CCN active (with kappa(CCN) in the range 0.001-0.16), and in dark experiments with no OH scavenger present, kappa(CCN) decreased when particles were sent through the thermodenuder (with a temperature up to 50 degrees C). SOA was generated under different experimental conditions: In some experiments, an OH scavenger (2-butanol) was added. SOA from these experiments was less CCN active than SOA produced in experiments without an OH scavenger (i.e. where OH was produced during ozonolysis). In other experiments, lights were turned on, either without or with the addition of HONO (OH source). This led to the formation of more CCN active SOA. SOA was aged up to 30 h through exposure to ozone and (in experiments with no OH scavenger present) to OH. In all experiments, the derived kappa(CCN) consistently increased with time after initial injection of beta-caryophyllene, showing that chemical ageing increases the CCN activity of beta-caryophyllene SOA. kappa(CCN) was also observed to depend on supersaturation, which was explained either as an evaporation artifact from semi-volatile SOA (only observed in experiments lacking light exposure) or, alternatively, by effects related to chemical composition depending on dry particle size. Using the method of Threshold Droplet Growth Analysis it was also concluded that the activation kinetics of the SOA do not differ significantly from calibration ammonium sulphate aerosol for particles aged for several hours. (Less)
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type
Contribution to journal
publication status
published
subject
in
Atmospheric Chemistry and Physics
volume
13
issue
4
pages
2283 - 2297
publisher
Copernicus Gesellschaft Mbh
external identifiers
  • wos:000315406600034
  • scopus:84890073835
ISSN
1680-7324
DOI
10.5194/acp-13-2283-2013
language
English
LU publication?
yes
id
3d3c4ede-b8a0-4ffd-bfaf-010e639d415a (old id 3671375)
date added to LUP
2013-04-23 12:59:20
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2019-02-20 01:26:28
@article{3d3c4ede-b8a0-4ffd-bfaf-010e639d415a,
  abstract     = {In a series of smog chamber experiments, the cloud condensation nuclei (CCN) activity of secondary organic aerosol (SOA) generated from ozonolysis of beta-caryophyllene was characterized by determining the CCN derived hygroscopicity parameter, kappa(CCN), from experimental data. Two types of CCN counters, operating at different temperatures, were used. The effect of semi-volatile organic compounds on the CCN activity of SOA was studied using a thermodenuder. Overall, SOA was only slightly CCN active (with kappa(CCN) in the range 0.001-0.16), and in dark experiments with no OH scavenger present, kappa(CCN) decreased when particles were sent through the thermodenuder (with a temperature up to 50 degrees C). SOA was generated under different experimental conditions: In some experiments, an OH scavenger (2-butanol) was added. SOA from these experiments was less CCN active than SOA produced in experiments without an OH scavenger (i.e. where OH was produced during ozonolysis). In other experiments, lights were turned on, either without or with the addition of HONO (OH source). This led to the formation of more CCN active SOA. SOA was aged up to 30 h through exposure to ozone and (in experiments with no OH scavenger present) to OH. In all experiments, the derived kappa(CCN) consistently increased with time after initial injection of beta-caryophyllene, showing that chemical ageing increases the CCN activity of beta-caryophyllene SOA. kappa(CCN) was also observed to depend on supersaturation, which was explained either as an evaporation artifact from semi-volatile SOA (only observed in experiments lacking light exposure) or, alternatively, by effects related to chemical composition depending on dry particle size. Using the method of Threshold Droplet Growth Analysis it was also concluded that the activation kinetics of the SOA do not differ significantly from calibration ammonium sulphate aerosol for particles aged for several hours.},
  author       = {Frosch, Mia and Bilde, M. and Nenes, A. and Praplan, A. P. and Juranyi, Z. and Dommen, J. and Gysel, M. and Weingartner, E. and Baltensperger, U.},
  issn         = {1680-7324},
  language     = {eng},
  number       = {4},
  pages        = {2283--2297},
  publisher    = {Copernicus Gesellschaft Mbh},
  series       = {Atmospheric Chemistry and Physics},
  title        = {CCN activity and volatility of beta-caryophyllene secondary organic aerosol},
  url          = {http://dx.doi.org/10.5194/acp-13-2283-2013},
  volume       = {13},
  year         = {2013},
}