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Atmospheric Chemistry and Physics An interactive open-access journal of the European Geosciences Union
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Volume 17, issue 12 | Copyright
Atmos. Chem. Phys., 17, 7581-7591, 2017
https://doi.org/10.5194/acp-17-7581-2017
© Author(s) 2017. This work is distributed under
the Creative Commons Attribution 3.0 License.

Research article 22 Jun 2017

Research article | 22 Jun 2017

Nucleation modeling of the Antarctic stratospheric CN layer and derivation of sulfuric acid profiles

Steffen Münch1,a and Joachim Curtius1 Steffen Münch and Joachim Curtius
  • 1Institute for Atmospheric and Environmental Sciences, Goethe University Frankfurt am Main, 60323 Frankfurt am Main, Germany
  • anow at: Institute for Atmospheric and Climate Science, ETH Zurich, 8092 Zurich, Switzerland

Abstract. Recent analysis of long-term balloon-borne measurements of Antarctic stratospheric condensation nuclei (CN) between July and October showed the formation of a volatile CN layer at 21–27km altitude in a background of existing particles. We use the nucleation model SAWNUC to simulate these CN in subsiding air parcels and study their nucleation and coagulation characteristics. Our simulations confirm recent analysis that the development of the CN layer can be explained with neutral sulfuric acid–water nucleation and we show that outside the CN layer the measured CN concentrations are well reproduced just considering coagulation and the subsidence of the air parcels. While ion-induced nucleation is expected as the dominating formation process at higher temperatures, it does not play a significant role during the CN layer formation as the charged clusters recombine too fast. Further, we derive sulfuric acid concentrations for the CN layer formation. Our concentrations are about 1 order of magnitude higher than previously presented concentrations as our simulations consider that nucleated clusters have to grow to CN size and can coagulate with preexisting particles. Finally, we calculate threshold sulfuric acid profiles that show which concentration of sulfuric acid is necessary for nucleation and growth to observable size. These threshold profiles should represent upper limits of the actual sulfuric acid outside the CN layer. According to our profiles, sulfuric acid concentrations seem to be below midlatitude average during Antarctic winter but above midlatitude average for the CN layer formation.

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Recent research has analyzed the formation of a particle (CN) layer in the stratosphere above Antarctica after sunrise. We investigate the CN layer formation processes with our particle formation model and derive sulfuric acid profiles (no measurements exist). Our study confirms existing explanations and gives more insights into the formation process, leading to higher derived concentrations. Therefore, this paper improves our understanding of the processes in the high atmosphere.
Recent research has analyzed the formation of a particle (CN) layer in the stratosphere above...
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