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AGU: Geophysical Research Letters

 

Index Terms

  • Atmospheric Composition and Structure: Aerosols and particles
  • Atmospheric Composition and Structure: Chemical kinetic and photochemical properties
  • Atmospheric Composition and Structure: Air/sea constituent fluxes
  • Atmospheric Composition and Structure: Troposphere—composition and chemistry

Abstract

GEOPHYSICAL RESEARCH LETTERS, VOL. 29, 1101, 4 PP., 2002
doi:10.1029/2001GL013881

Variation of marine aerosol acidity with particle size

William C. Keene

Department of Environmental Sciences, University of Virginia, Charlottesville, USA

Alexander A. P. Pszenny

Center for Global Change Science, Massachusetts Institute of Technology, Cambridge, USA

John R. Maben

Department of Environmental Sciences, University of Virginia, Charlottesville, USA

Rolf Sander

Air Chemistry Division, Max Planck Institute for Chemistry, Mainz, Germany

pHs were measured in minimally diluted extracts of size-segregated aerosols sampled under moderately polluted conditions at Bermuda during spring 1997. Extrapolation to aerosol liquid water contents yielded ambient pHs for most super-μm diameter size fractions in the upper 3s to upper 4s. Aerosols within this size range of each sample approached similar pH. These results are consistent with recent estimates of sea-salt aerosol pHs based on thermodynamic considerations and model calculations. Most pHs for finer aerosol size fractions were in the 1s and 2s. The H+ + SO42− ↔ HSO4− equilibrium strongly buffered aerosol pH in all size fractions.

Published 6 April 2002.

Citation: Keene, W. C., A. A. P. Pszenny, J. R. Maben, and R. Sander (2002), Variation of marine aerosol acidity with particle size, Geophys. Res. Lett., 29(7), 1101, doi:10.1029/2001GL013881.

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