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- W2898885372 abstract "The oxidation budget of the tropospheric gas phase is relatively well known. However, the concentrations and turnover rates of important oxidants such as OH that are present in the tropospheric aqueous phase are considerably more uncertain, as a result of the higher complexity of associated multiphase chemical interactions involved. This chapter outlines (i) the current understanding of the aqueous-phase OH oxidation budget, (ii) recent progress within the field with a focus on the uptake of highly oxidized organics as well as their effects on the oxidation capacity in aqueous aerosols, and (iii) future research objectives. In detail, the first part presents an overview on photochemical OH sinks and sources within the tropospheric aqueous phase, focusing on modelled and measured in-situ formation rates of OH. It also discusses current discrepancies between models and measurements as well as, finally, the limitations of both. In this part, model simulations using CAPRAM are presented. They demonstrate that utilizing a more detailed organic chemistry leads to substantially lowered aqueous-phase OH concentrations, more closely aligning modelled and measured OH concentrations. In the second part, a summary of current state-of-the-art knowledge on the role and fate of organic peroxides, labile hydroperoxides, and other organic peroxy species as potential OH sources is given. Furthermore, recent results of a model case study utilizing CAPRAM are presented, allowing an examination of the uptake and chemistry of highly oxidized organics from the gas phase and its effects. The case study demonstrates that the uptake and subsequent decomposition of labile hydroperoxides may lead to a mean increase of 19% of the aqueous OH sink and source rates. Finally, a brief perspective is given, including an outline of current gaps within the knowledge on the oxidation budget in aqueous aerosols as well as research objectives for future laboratory, field and model investigations." @default.
- W2898885372 created "2018-11-09" @default.
- W2898885372 creator A5003239040 @default.
- W2898885372 creator A5024951130 @default.
- W2898885372 date "2018-01-01" @default.
- W2898885372 modified "2023-10-16" @default.
- W2898885372 title "Tropospheric Aqueous-Phase OH Oxidation Chemistry: Current Understanding, Uptake of Highly Oxidized Organics and Its Effects" @default.
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- W2898885372 doi "https://doi.org/10.1021/bk-2018-1299.ch004" @default.