Mechanism of Non-photochemical Production of Sulfates in Aerosol Haze

摘要

Abstract The paper considers the mechanism of non-additive enhancement of the catalytic action of Mn/Fe ions (synergism) in the liquid-phase oxidation of sulfur dioxide (SO2) with molecular oxygen in relation to the non-photochemical production of sulfates in the aerosol haze particles in the atmosphere. It was found that a key role in this process is played by the chain branching reaction involving Mn ions and the intermediate product of the reaction: Caro’s acid (HSOdocumentclass[12pt]{minimal} usepackage{amsmath} usepackage{wasysym} usepackage{amsfonts} usepackage{amssymb} usepackage{amsbsy} usepackage{mathrsfs} usepackage{upgreek} setlength{oddsidemargin}{-69pt} begin{document}$$_5^{-}$$end{document}). The microphysics of the local production of sulfates in the Arctic haze particles is discussed. The process is assumed to proceed in a thin layer of supercooled water covering aerosol particles. According to the estimates, the catalysis of SO2?oxidation by transition metal ions should be considered as a significant non-photochemical source of sulfates, especially in an urbanized atmosphere.