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Relaxed step functions for evaluation of CCN counter data on size-separated aerosol particles

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Author

Summary, in English

tmospherically important data are gained from cloud condensation nucleus counter (CCNC) analysis of aerosols that are particle mobility separated using differential mobility analysers (I)MA). We present relaxed step functions that can be fitted to these data to obtain critical diameters or critical supersaturations. The step functions are based on the DMA transfer function. We treat the case with fixed supersaturation and varied particle diameter as well as fixed particle size and varied supersaturation. Comparison with experimental data shows that the width of the DMA transfer function controls the steepness of the relaxed step function. The less steep slope in the activation curve caused by the presence of a slightly soluble compound in the particle is discussed. Also in this case, the DMA transfer function width influences the steepness of the activation curve. Finally we demonstrate the errors made if doubly charged particles are not accounted for and a wide DMA transfer function is used.

Publishing year

2008

Language

English

Pages

592-608

Publication/Series

Journal of Aerosol Science

Volume

39

Issue

7

Document type

Journal article

Publisher

Elsevier

Topic

  • Subatomic Physics
  • Physical Geography

Keywords

  • activation
  • CCN
  • DMA
  • transfer function
  • solubility

Status

Published

Research group

  • Aerosol, Nuclear Physics

ISBN/ISSN/Other

  • ISSN: 0021-8502