Mass-Independent Sulfur Isotopic Compositions in Stratospheric Volcanic Eruptions-Reference-Cited by-同舟云学术

Mass-Independent Sulfur Isotopic Compositions in Stratospheric Volcanic Eruptions

Published:2007-01-05 Issue:5808 Volume:315 Page:84-87
ISSN:0036-8075
Container-title:Science
language:en
Short-container-title:Science

Author:

Baroni Mélanie¹²,Thiemens Mark H.¹²,Delmas Robert J.¹²,Savarino Joël¹²

Affiliation:

1. Laboratoire de Glaciologie et Géophysique de l'Environnement, CNRS/Université Joseph Fourier, 38400 St. Martin d'Hères, France.

2. Department of Chemistry and Biochemistry, University of California, San Diego, La Jolla, CA 92093–0356, USA.

Abstract

The observed mass-independent sulfur isotopic composition (Δ 33 S) 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 Δ 33 S changes over time from an initial positive component to a negative value. Δ 33 S 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 Δ 33 S is a reliable tracer to chemically identify atmospheric processes involved during stratospheric volcanism.

Publisher

American Association for the Advancement of Science (AAAS)

Subject

Multidisciplinary

Reference27 articles.

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4. The deviation from the mass-dependent relationships is calculated by the following equations: Δ 33 S = δ 33 S – 1000*[(1 + δ 34 S/1000) 0 515 – 1] and Δ 36 S = δ 36 S – 1000*[(1 + δ 34 S/1000) 1 91 – 1]. Considering the small size of the samples our analytical accuracy with a 2σ uncertainty is equal to 0.12‰ for Δ 33 S and varies from 0.64 to 1.63‰ for Δ 36 S. Only |Δ 33 S| > 0.12‰ and |Δ 36 S| > 0.64‰ are considered as diagnostic of MIF in the present study. Uncertainties (2σ) are 0.07 0.19 and 0.53 to 1.59‰ for δ 33 S δ 34 S and δ 36 S respectively.

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