This study has employed the master chemical mechanism (MCM) to investigate the influence of the ozone oxidation pathways in the atmospheric formation of HSO from short-chain olefins in industrialized areas. In-situ HSO formation data were obtained using a high-resolution chemical ionization time-of-flight mass spectrometer, and the simulated HSO concentrations calculated using updated parameters for the MCM model exhibited good agreement with observations. In the simulation analysis of different reaction pathways involved in HSO formation, hydroxyl radicals were found to dominate HSO production during the daytime, while olefin ozone oxidation contributed up to 65% of total HSO production during the night-time. A sensitivity analysis of the HSO production parameters has revealed a high sensitivity to changes in sulfur dioxide, and a relatively high sensitivity to olefins with fast ozonolysis reaction rates and bimolecular reaction rates of resulting stabilized Criegee Intermediates. A high relative humidity promotes daytime HSO formation, but has an inhibiting effect during the night-time due to the different dominant reaction pathways.
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| http://dx.doi.org/10.1016/j.jes.2023.11.012 | DOI Listing |
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