Mass-Independent Sulfur Isotopic Compositions in Stratospheric Volcanic Eruptions
International audience 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 a...
Published in: | Science |
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Main Authors: | , , , |
Other Authors: | , , , , , |
Format: | Article in Journal/Newspaper |
Language: | English |
Published: |
HAL CCSD
2007
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Subjects: | |
Online Access: | https://insu.hal.science/insu-00375891 https://doi.org/10.1126/science.1131754 |
Summary: | International audience 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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