Growth laws for atmospheric aerosol particles: An examination of the bimodality of the accumulation mode

Veli Matti Kerminen, Anthony S. Wexler

Research output: Contribution to journalArticle

100 Scopus citations

Abstract

The growth of atmospheric aerosol particles was examined by first deriving growth laws and their corresponding time scales for all the important aerosol processes: condensation, coagulation, aqueous-phase reactions in droplets or aerosol particles, and reactions taking place at the interface of two phases. These: tools were then used to explore and explain the frequently observed splitting of the accumulation mode into two individual modes. Two environments-the remote marine boundary layer and the South Coast Air Basin of Los Angeles (SoCAB)-were considered. Our analysis points out that the observed mode separation cannot result from condensational or coagulational growth. In both the marine boundary layer and the SoCAB, H2O2/O3 sulfate formation in droplets during clouds or fogs provides all the features required for explaining the bimodality. In the SoCAB, this process may be assisted or even dominated by the trace metal catalyzed droplet-phase SO2 oxidation.

Original languageEnglish (US)
Pages (from-to)3263-3275
Number of pages13
JournalAtmospheric Environment
Volume29
Issue number22
StatePublished - Nov 1995
Externally publishedYes

Keywords

  • aqueous-phase chemistry
  • Atmospheric aerosols
  • coagulation
  • condensation
  • growth laws
  • interphase reactions
  • particle size distribution
  • time scale

ASJC Scopus subject areas

  • Environmental Science(all)
  • Atmospheric Science
  • Pollution
  • Earth and Planetary Sciences(all)

Fingerprint Dive into the research topics of 'Growth laws for atmospheric aerosol particles: An examination of the bimodality of the accumulation mode'. Together they form a unique fingerprint.

  • Cite this