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

Svenningsson, Birgitta LU and Bilde, Merete (2008) In Journal of Aerosol Science 39(7). p.592-608
Abstract
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... (More)
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. (Less)
Please use this url to cite or link to this publication:
author
organization
publishing date
type
Contribution to journal
publication status
published
subject
keywords
activation, CCN, DMA, transfer function, solubility
in
Journal of Aerosol Science
volume
39
issue
7
pages
592 - 608
publisher
Elsevier
external identifiers
  • wos:000257831900003
  • scopus:45049088779
ISSN
0021-8502
DOI
10.1016/j.jaerosci.2008.03.004
language
English
LU publication?
yes
id
b2358e17-ead7-44da-8628-f214595aab0d (old id 694552)
date added to LUP
2007-12-07 17:27:37
date last changed
2017-05-21 03:53:34
@article{b2358e17-ead7-44da-8628-f214595aab0d,
  abstract     = {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.},
  author       = {Svenningsson, Birgitta and Bilde, Merete},
  issn         = {0021-8502},
  keyword      = {activation,CCN,DMA,transfer function,solubility},
  language     = {eng},
  number       = {7},
  pages        = {592--608},
  publisher    = {Elsevier},
  series       = {Journal of Aerosol Science},
  title        = {Relaxed step functions for evaluation of CCN counter data on size-separated aerosol particles},
  url          = {http://dx.doi.org/10.1016/j.jaerosci.2008.03.004},
  volume       = {39},
  year         = {2008},
}