Volume 28, Issue 2 p. 247-250
Free Access

Variation of sea salt aerosol pH with relative humidity

Roland von Glasow

Roland von Glasow

Max-Planck-Institut für Chemie, Atmospheric Chemistry Division, PO Box 3060, D-55020 Mainz, Germany

Search for more papers by this author
Rolf Sander

Rolf Sander

Max-Planck-Institut für Chemie, Atmospheric Chemistry Division, PO Box 3060, D-55020 Mainz, Germany

Search for more papers by this author
First published: 15 January 2001
Citations: 2

Abstract

Calculations of the pH of sea salt aerosol particles show that the pH decreases with increasing relative humidity and therefore increasing liquid water content of the particles. We show that this puzzling effect is a result of the high concentration of chloride in the particles and the phase partitioning of HCl between the gas and aqueous phase, that makes the gas phase act as a reservoir for acidity for the sea salt particles. Implications for the marine boundary layer are briefly discussed.