期刊
PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA
卷 109, 期 51, 页码 20842-20847出版社
NATL ACAD SCIENCES
DOI: 10.1073/pnas.1212297109
关键词
OH production; photocatalysis; SO2 nucleation; LIDAR; atmospheric optics
资金
- French-German atmospheric research program [CNRS-Institut national des sciences de l'Univers/Deutsches Forschungsgemeinschaft (DFG)]
- Agence Nationale de la Recherche
- regional Rhone-Alpes environment research program
- Seventh Framework Programme (FP7) Project DFG-LEFE
- PEGASOS [European Union] [265307]
- DFG HaCHi project
Large quantities of mineral dust particles are frequently ejected into the atmosphere through the action of wind. The surface of dust particles acts as a sink for many gases, such as sulfur dioxide. It is well known that under most conditions, sulfur dioxide reacts on dust particle surfaces, leading to the production of sulfate ions. In this report, for specific atmospheric conditions, we provide evidence for an alternate pathway in which a series of reactions under solar UV light produces first gaseous sulfuric acid as an intermediate product before surface-bound sulfate. Metal oxides present in mineral dust act as atmospheric photocatalysts promoting the formation of gaseous OH radicals, which initiate the conversion of SO2 to H2SO4 in the vicinity of dust particles. Under low dust conditions, this process may lead to nucleation events in the atmosphere. The laboratory findings are supported by recent field observations near Beijing, China, and Lyon, France.
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