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- W4304172616 abstract "Abstract. Formaldehyde (HCHO) is an important trace gas that affects the abundance of HO2 radicals and ozone, leads to complex photochemical processes, and yields a variety of secondary atmospheric pollutants. In a 2021 summer campaign at the Dianshan Lake (DSL) Air Quality Monitoring Supersite in a suburban area of Shanghai, China, we measured atmospheric formaldehyde (HCHO) by a commercial Aero-Laser formaldehyde monitor, methane, and a range of non-methane hydrocarbons (NMHCs). Ambient HCHO showed a significant diurnal cycle with an average concentration of 2.2±1.8 ppbv (parts per billion by volume). Secondary production of HCHO was estimated to be approximately 70 % according to HCHO/NOx. The average secondary HCHO production rate was estimated to be 0.73 ppbv h-1, with a dominant contribution from reactions between alkenes and OH radicals (66.3 %), followed by OH radical-initiated reactions with alkanes and aromatics (together 19.0 %), OH radical-initiated reactions with OVOCs (8.7 %), and ozonolysis of alkenes (6.0 %). An overall HCHO loss, including HCHO photolysis, reactions with OH radicals, and dry deposition, was estimated to be 0.49 ppbv h-1. The net HCHO production was in good agreements with the observed rate of HCHO concentration change throughout the sunny days, indicating that HCHO was approximately produced by oxidation of the 24 hydrocarbons we took into account at the DSL site during the campaign, where primary emissions and transport processes can likely be excluded. Our results suggest the important role of secondary pollution at the suburb of Shanghai, where alkenes are likely key precursors for HCHO." @default.
- W4304172616 created "2022-10-11" @default.
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- W4304172616 date "2022-10-11" @default.
- W4304172616 modified "2023-10-15" @default.
- W4304172616 title "Measurement report: Production and loss of atmospheric formaldehyde at a suburban site of Shanghai in summertime" @default.
- W4304172616 doi "https://doi.org/10.5194/acp-2022-682" @default.
- W4304172616 hasPublicationYear "2022" @default.
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