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Evaporation of sulfate aerosols at low relative humidity

Tsagkogeorgas, Georgios; Roldin, Pontus LU ; Duplissy, Jonathan; Rondo, Linda; Tröstl, Jasmin; Slowik, Jay G.; Ehrhart, Sebastian; Franchin, Alessandro; Kürten, Andreas and Amorim, Antonio, et al. (2017) In Atmospheric Chemistry and Physics 17(14). p.8923-8938
Abstract

Evaporation of sulfuric acid from particles can be important in the atmospheres of Earth and Venus. However, the equilibrium constant for the dissociation of H2SO4 to bisulfate ions, which is the one of the fundamental parameters controlling the evaporation of sulfur particles, is not well constrained. In this study we explore the volatility of sulfate particles at very low relative humidity. We measured the evaporation of sulfur particles versus temperature and relative humidity in the CLOUD chamber at CERN. We modelled the observed sulfur particle shrinkage with the ADCHAM model. Based on our model results, we conclude that the sulfur particle shrinkage is mainly governed by H2SO4 and potentially to some extent... (More)

Evaporation of sulfuric acid from particles can be important in the atmospheres of Earth and Venus. However, the equilibrium constant for the dissociation of H2SO4 to bisulfate ions, which is the one of the fundamental parameters controlling the evaporation of sulfur particles, is not well constrained. In this study we explore the volatility of sulfate particles at very low relative humidity. We measured the evaporation of sulfur particles versus temperature and relative humidity in the CLOUD chamber at CERN. We modelled the observed sulfur particle shrinkage with the ADCHAM model. Based on our model results, we conclude that the sulfur particle shrinkage is mainly governed by H2SO4 and potentially to some extent by SO3 evaporation. We found that the equilibrium constants for the dissociation of H2SO4 to HSO4-(KH2SO4) and the dehydration of H2SO4 to SO3 (KSO3) are KH2SO4 Combining double low line 2-4 × 109 kg-1 and KSO3 ≥ 1.4 × g 1010 at 288.8± 5K.

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publication status
published
subject
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Atmospheric Chemistry and Physics
volume
17
issue
14
pages
16 pages
publisher
Copernicus Gesellschaft Mbh
external identifiers
  • scopus:85026241998
  • wos:000406247200001
ISSN
1680-7316
DOI
10.5194/acp-17-8923-2017
language
English
LU publication?
yes
id
fd92aa6f-79fb-4183-898b-11a134a6d16b
date added to LUP
2017-08-04 10:37:43
date last changed
2017-09-18 11:40:56
@article{fd92aa6f-79fb-4183-898b-11a134a6d16b,
  abstract     = {<p>Evaporation of sulfuric acid from particles can be important in the atmospheres of Earth and Venus. However, the equilibrium constant for the dissociation of H2SO4 to bisulfate ions, which is the one of the fundamental parameters controlling the evaporation of sulfur particles, is not well constrained. In this study we explore the volatility of sulfate particles at very low relative humidity. We measured the evaporation of sulfur particles versus temperature and relative humidity in the CLOUD chamber at CERN. We modelled the observed sulfur particle shrinkage with the ADCHAM model. Based on our model results, we conclude that the sulfur particle shrinkage is mainly governed by H<sub>2</sub>SO<sub>4</sub> and potentially to some extent by SO<sub>3</sub> evaporation. We found that the equilibrium constants for the dissociation of H<sub>2</sub>SO<sub>4</sub> to HSO<sub>4</sub>-(KH<sub>2</sub>SO<sub>4</sub>) and the dehydration of H<sub>2</sub>SO<sub>4</sub> to SO<sub>3</sub> (KSO<sub>3</sub>) are KH<sub>2</sub>SO<sub>4</sub> Combining double low line 2<sup>-4</sup> × 109 kg<sup>-1</sup> and KSO<sub>3</sub> ≥ 1.4 × g 1010 at 288.8± 5K.</p>},
  author       = {Tsagkogeorgas, Georgios and Roldin, Pontus and Duplissy, Jonathan and Rondo, Linda and Tröstl, Jasmin and Slowik, Jay G. and Ehrhart, Sebastian and Franchin, Alessandro and Kürten, Andreas and Amorim, Antonio and Bianchi, Federico and Kirkby, Jasper and Petäjä, Tuukka and Baltensperger, Urs and Boy, Michael and Curtius, Joachim and Flagan, Richard C. and Kulmala, Markku and Donahue, Neil M. and Stratmann, Frank},
  issn         = {1680-7316},
  language     = {eng},
  month        = {07},
  number       = {14},
  pages        = {8923--8938},
  publisher    = {Copernicus Gesellschaft Mbh},
  series       = {Atmospheric Chemistry and Physics},
  title        = {Evaporation of sulfate aerosols at low relative humidity},
  url          = {http://dx.doi.org/10.5194/acp-17-8923-2017},
  volume       = {17},
  year         = {2017},
}