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Göran Frank

Director of graduate studies

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

Author

  • Brett A. Yuskiewicz
  • Douglas Orsini
  • Frank Stratmann
  • Manfred Wendisch
  • Alfred Wiedensohler
  • Jost Heintzenberg
  • Bengt G. Martinsson
  • Göran Frank
  • Wolfram Wobrock
  • Dieter Schell

Summary, in English

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.

Department/s

  • Nuclear physics

Publishing year

1998-02-01

Language

English

Pages

33-45

Publication/Series

Contributions to Atmospheric Physics

Volume

71

Issue

1

Document type

Journal article

Publisher

Deutsche Meteorologische Gesellschaft / Friedr. Vieweg & Sohn Verlagsgesellschaft mbh

Topic

  • Other Physics Topics

Status

Published

ISBN/ISSN/Other

  • ISSN: 0005-8173