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Dimethyl Sulphide (DMS) is thought to contribute up to 40 percent of the sulphate recorded in the global atmosphere. A major source of DMS is phytoplankton in the oceans which expel sulphur gas to the atmosphere. The concentration of DMS over marine regions has been connected to the formation of condensation nuclei and ultimately cloud condensation nuclei. This influence in cloud formation means that DMS can have a significant influence on the Earth's radiation budget and consequently climate regulation. The object of this project was to identify and quantify the importance of different methods of photo-oxidation of DMS that lead to sulphuric acid production. Sulphuric acid formation is an important factor when considering climatic and environmental processes. The prediction of sulphuric acid yield in any area of the troposphere will be an invaluable tool for determination of significant climatic events. DMS is oxidised to DMSO under many different atmospheric conditions. Laboratory simulations will be investigating the main pathways in the oxidation of DMS that lead to the production of sulphuric acid and sulphur dioxide. The results achieved will contribute to the understanding of the chemical processes that control the natural sulphur cycle.

Additional information

Authors: ZETZSCH C, FHG ITA Hannover, Fraunhofer Institut f�r Toxikologie und Aerosolforschung, Hannover (DE);MARTINEZ E, University of Castilla La Mancha, Departamento de Quimica Fisica, Facultad de Quimicas, Cuidad Real (ES);MIHALOPOULOS N, University of Crete, Division of Environmental and Analytical Chemistry, Department of Chemistry, Heraklion (GR);LE BRAS G, CNRS-LCSR Orl�ans, Laboratoire de Combustion et Syst�mes R�actifs, CRNS, Orl�ans (FR);BARNES I, University of Wuppertal, Physikalische Chemie, Wuppertal (DE);HJORTH J, European Commission, Joint Research Centre, Environment Institute, Ispra (IT)
Bibliographic Reference: EUR 19569 EN (2000) 111 pp
Availability: Available from the European Commission
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