Mineral dust photochemistry induces nucleation events in the presence of SO2
| Autor: | Andreas Nowak, Bettina Nekat, Benjamin Thomas, Christian George, Barbara D'Anna, Yoan Dupart, Alfred Wiedensohler, Hartmut Herrmann, Grégory David, Patrick Rairoux, Stephanie King, Alain Miffre |
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| Přispěvatelé: | AIR (AIR), Institut de recherches sur la catalyse et l'environnement de Lyon (IRCELYON), Université Claude Bernard Lyon 1 (UCBL), Université de Lyon-Université de Lyon-Centre National de la Recherche Scientifique (CNRS)-Institut de Chimie du CNRS (INC)-Université Claude Bernard Lyon 1 (UCBL), Université de Lyon-Université de Lyon-Centre National de la Recherche Scientifique (CNRS)-Institut de Chimie du CNRS (INC), AIR:EAU+JMH |
| Rok vydání: | 2012 |
| Předmět: |
China
Optics and Photonics 010504 meteorology & atmospheric sciences Photochemistry Ultraviolet Rays Radical Nucleation 010501 environmental sciences Mineral dust 01 natural sciences complex mixtures Metal chemistry.chemical_compound Astrophysics::Solar and Stellar Astrophysics Sulfur Dioxide Sulfate Physics::Chemical Physics Particle Size Sulfur dioxide Physics::Atmospheric and Oceanic Physics Astrophysics::Galaxy Astrophysics 0105 earth and related environmental sciences Ions Air Pollutants Multidisciplinary Chemistry Atmosphere Sulfates Water Sulfuric acid Dust [CHIM.CATA]Chemical Sciences/Catalysis Sulfuric Acids [SDE.ES]Environmental Sciences/Environmental and Society respiratory tract diseases Models Chemical 13. Climate action visual_art Physical Sciences visual_art.visual_art_medium Spectrophotometry Ultraviolet Particle size Astrophysics::Earth and Planetary Astrophysics France |
| Zdroj: | Proceedings of the National Academy of Sciences of the United States of America Proceedings of the National Academy of Sciences of the United States of America, National Academy of Sciences, 2012, 109, pp.20842-20847. ⟨10.1073/pnas.1212297109⟩ Proceedings of the National Academy of Sciences |
| ISSN: | 1091-6490 0027-8424 |
| Popis: | 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 SO 2 to H 2 SO 4 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. |
| Databáze: | OpenAIRE |
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