Aerosol pH in the marine boundary layer

The underappreciated role of nonvolatile cations on aerosol ammonium-sulfate molar ratios

“…One is related to the variation of aerosol composition with size, which may translate to a large range of acidity, hence equilibrium composition (Keene et al, 1998;Nenes 40 Atmos. Chem.…”

Real-time measurement of sodium in single aerosol particles by flame emission: laboratory characterization

“…Seasalt aerosol particles are an important component of marine air a!ecting both physical processes, such as light scattering and cloud droplet growth, and chemical process involving the uptake and release of reactive gases (Livingston & Finlayson-Pitts, 1991;Chameides & Stelson, 1992;Sievering et al, 1992;Keene et al, 1998). Seasalt particles are produced at the ocean surface by the bursting of entrained air bubbles produced by the action of wind (Woodcock, 1953;Blanchard & Woodcock, 1957, 1980Blanchard, 1983;Monahan, Spiel, & Davidson, 1986;Gong, Barrie, Blanchet, & Spacek, 1998).…”

Oxidation of elemental mercury by aqueous chlorine (HOCl/OCl−): Implications for tropospheric mercury chemistry

“…Furthermore, the steady state concentrations of aqueous Hg(II) in Figures 4a and 4b are several times greater than those in Figures 3a and 3b, indicating that the steady state levels are very sensitive to the gaseous phase concentrations of chlorine. In the marine boundary layer, the pH of deliquesced sea-salt aerosols has been reported to range from < 1 to > 9 [ Keene et al, 1998]. At extremely low pH, the reactive chlorine may not contribute any Hg(II) production in the aqueous phase because the low pH would lead to the evaporation of chlorine from the aqueous phase.…”