A numerical investigation of the destruction of peroxy radical by Cu ion catalysed reactions on atmospheric particles |
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Authors: | Howard B Ross Kevin J Noone |
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Institution: | (1) Department of Meteorology, Stockholm University, S-106 91 Stockholm, Sweden |
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Abstract: | To determine if Cu mediated reactions on atmospheric particles are important to HO2 chemistry in the ambient atmosphere, Cu molalities were calculated from measured Cu aerosol particle concentrations, mass and number size distribution data from a site in central Sweden. A comparison of characteristic times indicates that at low relative humidities the reaction is limited by the mass transport of gas phase HO2 to the particle surface and not by the chemical kinetics of the aqueous reaction. Comparison of half-lives for particle reactions and the gas phase destruction of HO2 to form H2O2 indicate that heterogeneous reactions on aerosol particles may have important consequences on the chemistry of HO2 and H2O2 in the troposphere. |
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Keywords: | Atmosphere aerosol particles metal catalyst peroxy radical hydrogen peroxide |
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