Journal of Atmospheric Chemistry

, Volume 57, Issue 3, pp 215–237 | Cite as

Size dependent partitioning of organic material: evidence for the formation of organic coatings on aqueous aerosols

  • T. Anttila
  • A. Kiendler-Scharr
  • Th. F. Mentel
  • R. Tillmann
Article
First Online:
Received:
Accepted:

Abstract

Organic aerosol formation resulting from the ozonolysis of α-pinene, myrcene and sabinene was investigated in a large aerosol chamber in the presence of aqueous seed aerosols. The chemical composition of the particles was monitored by an aerosol mass spectrometer (Aerodyne Research Inc.) as a function of time and the particle size. Smaller particles were found to contain more organics relative to sulfate than the larger ones. In contrast, the water to sulfate mass ratio was not dependent on the particle size. These experimental findings indicate the formation of organic layers on the particles. With the aid of an aerosol dynamic model we demonstrate that the observations are consistent with the formation of multilayered organic films having thicknesses of approximately 10 nm. The results also suggest that the films were formed through condensation of low-volatile oxidation products that did not take up water considerably. Even though dissolution of oxidation products into the particle aqueous phase cannot be conclusively ruled out, the most plausible interpretation of the results is that the monoterpene ozonolysis lead to the formation of organic coatings on aqueous aerosols. Such films are likely to form in regions with monoterpene emissions.

Keywords

Aerosol dynamic modeling Aerosol mass spectrometer Organic films Secondary organic aerosol 
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Notes

Acknowledgments

We acknowledge the fruitful discussions with Dr. Yinon Rudich. We also acknowledge the comments of both referees which helped us to improve the manuscript substantially. This work is part of the CASOMIO project and is supported by the EC (contract number EVK2-CT-2001-00124). One of the authors (T.A.) gratefully acknowledges financial support from the Helsingin Sanomat Centennial Foundation.

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Copyright information

© Springer Science+Business Media, B.V. 2007

Authors and Affiliations

  • T. Anttila
    • 2
  • A. Kiendler-Scharr
    • 1
  • Th. F. Mentel
    • 1
  • R. Tillmann
    • 1
  1. 1.ICG-2: Troposphäre, Forschungszentrum JülichJülichGermany
  2. 2.Finnish Meteorological Institute, Research and Development, Climate and Global ChangeHelsinkiFinland

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