| Zugriffsnummer | 28675 |
| Dokumenttyp | Zeitschriftenartikel |
| Sprache | Englisch |
| Titel | Mineral dust photochemistry induces nucleation events in the presence of SO2 |
| Autor(in); Institution |
Dupart, Yoan; Université de Lyon, Villeurbanne, FRANCE
King, Stephanie M.; University of Copenhagen, Copenhagen, DENMARK
Nekat, Bettina; Leibniz Institute for Tropospheric Research, Leipzig, GERMANY
Nowak, Andreas; 3.2, Gasanalytik und Zustandsverhalten, PTB-Braunschweig
Wiedensohler, Alfred; Leibniz Institute for Tropospheric Research, Leipzig, GERMANY
Herrmann, Hartmut; Leibniz Institute for Troposheric Research, Leipzig, GERMANY
David, Gregory; Université de Lyon, Villeurbanne, FRANCE
Thomas, Benjamin; Université de Lyon, Villeurbanne, FRANCE
Miffre, Alain; Université de Lyon, Villeurbanne, FRANCE
Rairoux, Patrick; Université de Lyon, Villeurbanne, FRANCE
D'Anna, Barbara; Université de Lyon, Villeurbanne, FRANCE
George, Chritian; Université de Lyon, Villeurbanne, FRANCE
|
| Quelle/Jahr | Proceedings of the National Academy of Sciences of the United States of America: 109 (2012), 51, 20842 - 20847 |
| ISSN | 0027-8424 (PRINT) ; 1091-6490 (ONLINE) |
| DOI | |
| Verlag | USA: National Acad. of Sciences |
| Freie Schlagworte | OH production ; photocatalysis ; SO2 nucleation ; LIDAR ; atmospheric optics |
| Zusammenfassung | 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. |
Zitierung
Dupart, Y., King, S. M., Nekat, B., Nowak, A., Wiedensohler, A., Herrmann, H., David, G., Thomas, B., Miffre, A., Rairoux, P., D'Anna, B., & George, C. (2012). Mineral dust photochemistry induces nucleation events in the presence of SO₂. Proceedings of the National Academy of Sciences of the United States of America, 109(51), 20842–20847. https://doi.org/10.1073/pnas.1212297109