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Changes in submicrometer particle distributions and light scattering during haze and fog events in a highly polluted environment

Yuskiewicz, Brett A. ; Orsini, Douglas ; Stratmann, Frank ; Wendisch, Manfred ; Wiedensohler, Alfred ; Heintzenberg, Jost ; Martinsson, Bengt G. LU ; Frank, Göran LU ; Wobrock, Wolfram and Schell, Dieter (1998) In Contributions to Atmospheric Physics 71(1). p.33-45
Abstract

The changes in submicrometer atmospheric particle size distributions measured with a Differential Mobility Particle Sizer (DMPS) system during a polluted fog experiment during November, 1994 are presented in this study. Results reveal three modes commonly evident in the size distribution (3 < DN < 843 nm) measurements; the ultrafine, Aitken and accumulation with respective geometric diameters, (Dgn), of 17, 110 and 400 nm. An additional mode, appears between the ultrafine and Aitken modes (Dgn = 52 nm) in approximately one quarter of the measurements and is linked to several industrial cities upwind of the measurement site. A stabile ultrafine mode appears consistently (84% of measurements) at... (More)

The changes in submicrometer atmospheric particle size distributions measured with a Differential Mobility Particle Sizer (DMPS) system during a polluted fog experiment during November, 1994 are presented in this study. Results reveal three modes commonly evident in the size distribution (3 < DN < 843 nm) measurements; the ultrafine, Aitken and accumulation with respective geometric diameters, (Dgn), of 17, 110 and 400 nm. An additional mode, appears between the ultrafine and Aitken modes (Dgn = 52 nm) in approximately one quarter of the measurements and is linked to several industrial cities upwind of the measurement site. A stabile ultrafine mode appears consistently (84% of measurements) at 16-17 nm throughout the campaign, suggestive of a source, such as a highway in the near vicinity. During fog and haze periods number concentrations for particles less than 25 nm and greater than 400 nm decrease by 78 and 95%, respectively. These changes do not affect the aerosol scattering efficiency significantly. The overall aerosol mass scattering efficiency determined for the Po Valley region is 4.3 ± 0.6 m2 g-1. Closure is achieved for light extinction predicted from droplet distributions and measured with a transmissiometer in 37 of 39 cases during fog periods. Measured and calculated light extinction, bext, covary strongly with an R2 of 0.92.

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author
organization
publishing date
type
Contribution to journal
publication status
published
subject
in
Contributions to Atmospheric Physics
volume
71
issue
1
pages
13 pages
publisher
Deutsche Meteorologische Gesellschaft / Friedr. Vieweg & Sohn Verlagsgesellschaft mbh
external identifiers
  • scopus:0031780024
ISSN
0005-8173
language
English
LU publication?
yes
id
94843710-53f9-4b8e-8e73-1160df1fc413
date added to LUP
2019-05-16 09:10:11
date last changed
2019-11-25 09:30:04
@article{94843710-53f9-4b8e-8e73-1160df1fc413,
  abstract     = {<p>The changes in submicrometer atmospheric particle size distributions measured with a Differential Mobility Particle Sizer (DMPS) system during a polluted fog experiment during November, 1994 are presented in this study. Results reveal three modes commonly evident in the size distribution (3 &lt; D<sub>N</sub> &lt; 843 nm) measurements; the ultrafine, Aitken and accumulation with respective geometric diameters, (D<sub>gn</sub>), of 17, 110 and 400 nm. An additional mode, appears between the ultrafine and Aitken modes (D<sub>gn</sub> = 52 nm) in approximately one quarter of the measurements and is linked to several industrial cities upwind of the measurement site. A stabile ultrafine mode appears consistently (84% of measurements) at 16-17 nm throughout the campaign, suggestive of a source, such as a highway in the near vicinity. During fog and haze periods number concentrations for particles less than 25 nm and greater than 400 nm decrease by 78 and 95%, respectively. These changes do not affect the aerosol scattering efficiency significantly. The overall aerosol mass scattering efficiency determined for the Po Valley region is 4.3 ± 0.6 m<sup>2</sup> g<sup>-1</sup>. Closure is achieved for light extinction predicted from droplet distributions and measured with a transmissiometer in 37 of 39 cases during fog periods. Measured and calculated light extinction, b<sub>ext</sub>, covary strongly with an R<sup>2</sup> of 0.92.</p>},
  author       = {Yuskiewicz, Brett A. and Orsini, Douglas and Stratmann, Frank and Wendisch, Manfred and Wiedensohler, Alfred and Heintzenberg, Jost and Martinsson, Bengt G. and Frank, Göran and Wobrock, Wolfram and Schell, Dieter},
  issn         = {0005-8173},
  language     = {eng},
  month        = {02},
  number       = {1},
  pages        = {33--45},
  publisher    = {Deutsche Meteorologische Gesellschaft / Friedr. Vieweg & Sohn Verlagsgesellschaft mbh},
  series       = {Contributions to Atmospheric Physics},
  title        = {Changes in submicrometer particle distributions and light scattering during haze and fog events in a highly polluted environment},
  volume       = {71},
  year         = {1998},
}