Impacts of cloud water droplets on the OH production rate from peroxide photolysis

Understanding the difference between observed and modeled concentrations of HO 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...

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Bibliographic Details
Published in:Physical chemistry chemical physics : PCCP 2017, Vol.19 (47), p.31621-31627
Main Authors: Martins-Costa, M T C, Anglada, J M, Francisco, J S, Ruiz-López, Manuel F
Format: Article
Language:English
Subjects:
Atmospheric chemistry
Atmospheric models
Chemical Sciences
Clouds
Computer simulation
Droplets
or physical chemistry
Ozone
Photochemistry
Photolysis
Radicals
Theoretical and
Troposphere
Water drops
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Summary:Understanding the difference between observed and modeled concentrations of HO 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 HO radicals, especially at low NO 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.
ISSN:1463-9076
1463-9084
DOI:10.1039/c7cp06813a