Sulfur (32S, 33S, 34S, 36S) and oxygen (16O,17O,18O) isotopic ratios of primary sulfate produced from combustion processes |
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| Authors: | C. C. &# W. LEE,J. H. SAVARINO ,H. CACHIER, M. H. THIEMENS |
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| Affiliation: | Department of Chemistry and Biochemistry, University of California —San Diego, La Jolla, 92093-0356 CA, USA;;Laboratoire de Glaciologie et Géophysique de l'Environnement, CNRS, BP 96, 38402 St Martin d'Hères, France;;Laboratoire des Sciences du Climat et de l'Environnement, CEA/CNRS, 91190 Gif sur Yvette, France |
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| Abstract: | The recent discovery of an anomalous enrichment in 17O isotope in atmospheric sulfate has opened a new way to investigate the oxidation pathways of sulfur in the atmosphere. From laboratory investigations, it has been suggested that the wet oxidation of sulfur in rain droplets was responsible for the excess 17O. In order to confirm this theory, sulfur and oxygen isotope ratios of different primary sulfates produced during fossil fuel combustion have been investigated and are reported. None of these samples exhibits any anomalous oxygen or sulfur isotopic content, as compared to urban sulfate aerosols. These results, in agreement with the laboratory investigations, reinforce the idea of an aqueous origin for the oxygen-17 anomaly found in tropospheric sulfates. |
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