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  • Partitioning  (2)
  • 1
    Electronic Resource
    Electronic Resource
    Phase partitioning of aerosol particles in clouds at Kleiner Feldberg (1994)
    Springer
    Journal of atmospheric chemistry 19 (1994), S. 107-127 
    Details
    ISSN: 1573-0662
    Keywords: Partitioning ; aerosol particles ; cloud ; scavenging ; CVI
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Geosciences
    Notes: Abstract The partitioning of aerosol particles between cloud droplets and interstitial air by number and volume was determined both in terms of an integral value and as a function of size for clouds on Mt. Kleiner Feldberg (825 m asl), in the Taunus Mountains north-west of Frankfurt am Main, Germany. Differences in the integral values and the size dependent partitioning between two periods during the campaign were observed. Higher number and volume concentrations of aerosol particles in the accumulation mode were observed during Period II compared to Period I. In Period I on average 87±11% (±one standard deviation) and 73±7% of the accumulation mode volume and number were incorporated into cloud droplets. For Period II the corresponding fractions were 42±6% and 12±2% in one cloud event and 64±4% and 18±2% in another cloud event. The size dependent partitioning as a function of time was studied in Period II and found to have little variation. The major processes influencing the partitioning were found to be nucleation scavenging and entrainment.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00696585
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    The influence of aerosol particle composition on cloud droplet formation (1994)
    Springer
    Journal of atmospheric chemistry 19 (1994), S. 153-171 
    Details
    ISSN: 1573-0662
    Keywords: Partitioning ; sulphur ; elemental carbon ; nucleation scavenging ; single particle analysis
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Geosciences
    Notes: Abstract A difference in partitioning between cloud droplets and interstitial air for two chemical species (elemental carbon and sulphur) with different expected behaviour in nucleation scavenging was observed in clouds at Mt. Kleiner Feldberg (825 m asl), near Frankfurt, Germany. The fraction of sulphur incorporated in cloud droplets was always higher than the fraction of elemental carbon. This difference in partitioning has also been observed in fog but under different pollution conditions in the Po Valley, Italy. Both these studies were based on bulk samples. In the present study at Kleiner Feldberg, impactor samples of the particles in the interstitial air and the cloud droplet residuals were taken and a single particle analysis was done on the samples. It was found that, for a given particle size, the majority of particles forming cloud droplets were soluble and that insoluble particles preferentially remained in the interstitial air.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00696587
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    Paper (German National Licenses)
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