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Mass-Independent Sulfur Isotopic Compositions in Stratospheric Volcanic Eruptions

Abstract : The observed mass-independent sulfur isotopic composition (33S) of volcanic sulfate from the Agung (March 1963) and Pinatubo (June 1991) eruptions recorded in the Antarctic snow provides a mechanism for documenting stratospheric events. The sign of 33S changes over time from an initial positive component to a negative value. 33S is created during photochemical oxidation of sulfur dioxide to sulfuric acid on a monthly time scale, which indicates a fast process. The reproducibility of the results reveals that 33S is a reliable tracer to chemically identify atmospheric processes involved during stratospheric volcanism.
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Submitted on : Thursday, April 16, 2009 - 12:28:17 PM
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Mélanie Baroni, Mark H. Thiemens, Robert Delmas, Joël Savarino. Mass-Independent Sulfur Isotopic Compositions in Stratospheric Volcanic Eruptions. Science, American Association for the Advancement of Science (AAAS), 2007, 315 (5808), pp.84 à 87. ⟨10.1126/science.1131754⟩. ⟨insu-00375891⟩



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