Changes in submicrometer particle distributions and light scattering during haze and fog events in a highly polluted environment
(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.
(Less)
- author
- 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
- organization
- publishing date
- 1998-02-01
- 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
- 2022-01-31 20:01:05
@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 < D<sub>N</sub> < 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}}, }