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| Titel |
Aqueous phase oxidation of SO2 by O3 measured at the CERN CLOUD chamber |
| VerfasserIn |
Christopher Hoyle, Claudia Fuchs, Martin Gysel, Jasmin Troestl, Imad El Haddad, Carla Frege, Josef Dommen, Antonio Dias, Emma Jaervinen, Ottmar Moehler, Urs Baltensperger |
| Konferenz |
EGU General Assembly 2015
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| Medientyp |
Artikel
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| Sprache |
Englisch
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| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 17 (2015) |
| Datensatznummer |
250113623
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| Publikation (Nr.) |
 EGU/EGU2015-14304.pdf |
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| Zusammenfassung |
| Measurements of aerosol growth due to the oxidation of SO2 by O3 in cloud droplets at
temperatures of 10Ë C and -10Ë C are presented. Although this reaction has been well studied
in bulk solutions at temperatures above 0Ë C, this is, to the best of our knowledge, the first
time the reaction rate has been studied in laboratory formed, super-cooled cloud droplets.
These experiments were made possible by utilising the adiabatic expansion system
in the 27 m3 CLOUD (Cosmics Leaving Outdoor Droplets) chamber at CERN.
Experiments were performed on both acidic (sulphuric acid) and neutral (ammonium
sulphate) seed aerosol. During 6 minute cloud cycles, droplets of approximately
10μm diameter were formed, and the growth of the aerosol due to the uptake and
oxidation of SO2 was measured with a scanning mobility particle sizer (SMPS).
A microphysical model was developed to simulate the cloud droplet activation
and growth as well as the aqueous phase chemistry. The ability of the model to
accurately represent the observed aerosol growth is assessed, and the implications for the
extrapolation of the SO2+O3oxidation rates to sub-zero temperatures are discussed. |
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