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- W4251567276 abstract "Abstract. Nucleation is an important source of atmospheric aerosols which have significant climatic and health implications. Despite intensive theoretical and field studies during past decades, the dominant nucleation mechanism in the lower troposphere remains to be mysterious. Several recent laboratory studies on atmospheric nucleation may shed light on this important problem. However, the most interesting finding from those studies was based on the H2SO4 concentration whose accuracy has not yet been evaluated by any other methods. Moreover, the threshold H2SO4 concentration needed to reach the same degree of nucleation reported by two separate nucleation studies varies by about one order of magnitude. In this study, we apply a recently updated kinetic nucleation model to study the nucleation phenomena observed in those recent experiments. We show that the H2SO4 concentration can be estimated with a higher level of accuracy with the kinetic model by constraining the simulated particle size distributions with observed ones. We find that the H2SO4 concentration was underestimated in those studies by a factor of ~2 to 4. More importantly, by comparing the derived thermodynamic properties associated with the nucleation process, we conclude that different unknown species may participate in the two separate nucleation experimental studies, which may explain the large difference in the reported threshold H2SO4 concentration. Although the unknown species involved has yet to be identified, the derived values of thermodynamic properties can serve as a valuable guideline for the search of their chemical identities using advanced quantum-chemical approaches." @default.
- W4251567276 created "2022-05-12" @default.
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- W4251567276 date "2009-01-15" @default.
- W4251567276 modified "2023-10-16" @default.
- W4251567276 title "Kinetic modeling of nucleation experiments involving SO<sub>2</sub> and OH: new insights into the underlying nucleation mechanisms" @default.
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- W4251567276 doi "https://doi.org/10.5194/acpd-9-1273-2009" @default.
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