Impacts of cloud water droplets on the OH production rate from peroxide photolysis
Literature Information
M. T. C. Martins-Costa, J. M. Anglada, J. S. Francisco, Manuel F. Ruiz-López
Understanding the difference between observed and modeled concentrations of HOx radicals in the troposphere is a current major issue in atmospheric chemistry. It is widely believed that existing atmospheric models miss a source of such radicals and several potential new sources have been proposed. In recent years, interest has increased on the role played by cloud droplets and organic aerosols. Computer modeling of ozone photolysis, for instance, has shown that atmospheric aqueous interfaces accelerate the associated OH production rate by as much as 3–4 orders of magnitude. Since methylhydroperoxide is a main source and sink of HOx radicals, especially at low NOx concentrations, it is fundamental to assess what is the influence of clouds on its chemistry and photochemistry. In this study, computer simulations for the photolysis of methylhydroperoxide at the air–water interface have been carried out showing that the OH production rate is severely enhanced, reaching a comparable level to ozone photolysis.
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