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Droplet Formation and Growth in Polluted Fogs

Frank, Göran LU ; Martinsson, Bengt LU ; Cederfelt, Sven-Inge; Berg, Olle; Swietlicki, Erik LU ; Wendish, Manfred; Yuskiewicz, Brett; Heintzenberg, Jost; Wiedensohler, Alfred and Orsini, Douglas, et al. (1998) In Contributions to Atmospheric Physics 71(1). p.65-85
Abstract
Fog droplet formation and growth related to fog droplet activation were studied in a polluted region. The joint field experiments were carried out at San Pietro Capofiume in northern Italy during November 1994. It was found that the fog droplet number distribution was continuous in the size region 1-47 µm and that for most of the time the fog consisted of unactivated droplets, i.e. the droplets were smaller than the critical diameter for activation according to the Köhler equation. During a few time periods some of the droplets were possibly slightly larger than the critical diameter for activation. The solute concentration in the fog droplets was found to be strongly dependent and decreasing with increasing droplet size. The experimental... (More)
Fog droplet formation and growth related to fog droplet activation were studied in a polluted region. The joint field experiments were carried out at San Pietro Capofiume in northern Italy during November 1994. It was found that the fog droplet number distribution was continuous in the size region 1-47 µm and that for most of the time the fog consisted of unactivated droplets, i.e. the droplets were smaller than the critical diameter for activation according to the Köhler equation. During a few time periods some of the droplets were possibly slightly larger than the critical diameter for activation. The solute concentration in the fog droplets was found to be strongly dependent and decreasing with increasing droplet size. The experimental results were compared with results obtaied using a fog model. Good overall agreement was found between the model and the experimental results, with respect to fog droplet size related to dry residue size, and to fog droplet number distribution. The fog model was also used to study the influence on fog droplet growth of the rate of temperature decrease, the aerosol particle mass load and fog liquid water content. In addition the effect of aging of the fog was also considered. (Less)
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Contribution to journal
publication status
published
subject
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Contributions to Atmospheric Physics
volume
71
issue
1
pages
65 - 85
publisher
Deutsche Meteorologische Gesellschaft / Friedr. Vieweg & Sohn Verlagsgesellschaft mbh
external identifiers
  • scopus:0031776273
ISSN
0005-8173
language
English
LU publication?
yes
id
fd7f4d0e-2a21-4e0d-98e5-e9f602b59891 (old id 737857)
date added to LUP
2007-12-18 09:31:51
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2017-01-01 07:22:01
@article{fd7f4d0e-2a21-4e0d-98e5-e9f602b59891,
  abstract     = {Fog droplet formation and growth related to fog droplet activation were studied in a polluted region. The joint field experiments were carried out at San Pietro Capofiume in northern Italy during November 1994. It was found that the fog droplet number distribution was continuous in the size region 1-47 µm and that for most of the time the fog consisted of unactivated droplets, i.e. the droplets were smaller than the critical diameter for activation according to the Köhler equation. During a few time periods some of the droplets were possibly slightly larger than the critical diameter for activation. The solute concentration in the fog droplets was found to be strongly dependent and decreasing with increasing droplet size. The experimental results were compared with results obtaied using a fog model. Good overall agreement was found between the model and the experimental results, with respect to fog droplet size related to dry residue size, and to fog droplet number distribution. The fog model was also used to study the influence on fog droplet growth of the rate of temperature decrease, the aerosol particle mass load and fog liquid water content. In addition the effect of aging of the fog was also considered.},
  author       = {Frank, Göran and Martinsson, Bengt and Cederfelt, Sven-Inge and Berg, Olle and Swietlicki, Erik and Wendish, Manfred and Yuskiewicz, Brett and Heintzenberg, Jost and Wiedensohler, Alfred and Orsini, Douglas and Stratmann, Frank and Laj, Paolo and Ricci, Loretta},
  issn         = {0005-8173},
  language     = {eng},
  number       = {1},
  pages        = {65--85},
  publisher    = {Deutsche Meteorologische Gesellschaft / Friedr. Vieweg & Sohn Verlagsgesellschaft mbh},
  series       = {Contributions to Atmospheric Physics},
  title        = {Droplet Formation and Growth in Polluted Fogs},
  volume       = {71},
  year         = {1998},
}