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Hygroscopic properties and extinction of aerosol particles at ambient relative humidity in South-Eastern China

  • H. Eichler
  • , Y. F. Cheng
  • , W. Birmili
  • , A. Nowak
  • , A. Wiedensohler
  • , E. Brüggemann
  • , T. Gnauk
  • , H. Herrmann
  • , D. Althausen
  • , A. Ansmann
  • , R. Engelmann
  • , Matthias Tesche
  • , M. Wendisch
  • , Y. H. Zhang
  • , M. Hu
  • , S. Liu
  • , L. M. Zeng

    Research output: Contribution to journalArticlepeer-review

    86 Citations (Scopus)

    Abstract

    During the "Program of Regional Integrated Experiments of Air Quality over Pearl River Delta 2004 (PRIDE-PRD2004)" hygroscopic properties of particles in the diameter range 22 nm to 10 μ m were determined. For that purpose, a Humidifying Differential Mobility Particle Sizer (H-DMPS) and a Micro-Orifice Uniform Deposition Impactor (MOUDI) were operated. The derived size-dependent particle hygroscopic growth factors were interpolated to ambient relative humidity (RH) and used to calculate the particle number size distributions (PNSDs) at ambient conditions. A comparison between the modeled particle extinction coefficients (σext, Mie) and those observed with a Raman lidar was made. It is shown that the particle extinction coefficient (σext) at ambient RH can be properly estimated with Mie-model calculations based on the in situ physico-chemical measurements of dry and humidified PNSD and chemical composition.

    Original languageEnglish
    Pages (from-to)6321-6334
    Number of pages14
    JournalAtmospheric Environment
    Volume42
    Issue number25
    DOIs
    Publication statusPublished - Aug 2008

    Keywords

    • Descriptive hygroscopic growth factor
    • H-DMPS
    • Hygroscopicity
    • Particle extinction coefficient
    • PRD

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