Cited by 103Atmospheric chemistry and aerosolsPaleontology and Stratigraphy of FossilsGeological and Geochemical Analysis

Contribution of isotopologue self-shielding to sulfur mass-independent fractionation during sulfur dioxide photolysis

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Ono, S., Whitehill, A. R., Lyons, J. R.·2013·Journal of Geophysical Research Atmospheres

Abstract

Signatures of sulfur mass‐independent fractionation (S‐MIF) are observed for sulfur minerals in Archean rocks, and for modern stratospheric sulfate aerosols (SSA) deposited in polar ice. Ultraviolet light photolysis of SO2 is thought to be the most likely source for these S‐MIF signatures, although several hypotheses have been proposed for the underlying mechanism(s) of S‐MIF production. Laboratory SO2 photolysis experiments are carried out with a flow‐through photochemical reactor with a broadband (Xe arc lamp) light source at 0.1 to 5 mbar SO2 in 0.25 to 1 bar N2 bath gas, in order to test the effect of SO2 pressure on the production of S‐MIF. Elemental sulfur products yield high δ34S values up to 140 ‰, with δ33S/δ34S of 0.59 ± 0.04 and Δ36S/Δ33S ratios of −4.6 ± 1.3 with respect to initial SO2. The magnitude of the isotope effect strongly depends on SO2 partial pressure, with larger fractionations at higher SO2 pressures, but saturates at an SO2 column density of 1018 molecules cm−2. The observed pressure dependence and δ33S/δ34S and Δ36S/Δ33S ratios are consistent with model calculations based on synthesized SO2 isotopologue cross sections, suggesting a significant contribution of isotopologue self‐shielding to S‐MIF for high SO2 pressure (>0.1 mbar) experiments. Results of dual‐cell experiments further support this conclusion. The measured isotopic patterns, in particular the Δ36S/Δ33S relationships, closely match those measured for modern SSA from explosive volcanic eruptions. These isotope systematics could be used to trace the chemistry of SSA after large Plinian volcanic eruptions.

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  • Mass-independent fractionation of sulfur isotopes is thought to originate from photolysis and/or photoexcitation of volcanogenic SO2 by ultraviolet light in an anoxic atmosphere.

    “Mass-independent fractionation of sulfur isotopes (S-MIF) is thought to originate from the photolysis and/or photoexcitation of volcanogenic SO2 by ultraviolet light in an anoxic atmosphere (1, 20–23).”

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Research works printed but not linked: 3

  1. Jucks, K., D. Johnson, and K. Chance (1998). Observations of OH, HO 2 , H 2 O, and O 3 in the upper stratosphere: Implications for photochemistry. Geophys. Res. Lett., 25(21), 3935-3938.
  2. Sidebottom, H. W., C. C. Badcock, G. E. Jackson, J. G. Calvertl, G. W. Reinhardt, and E. K. Damon (1972), Photooxidation of sulfur dDioxide, Environ. Sci. Technol., 6(1), 72-79.
  3. Zmolek, P., X. Xu, T. Jackson, M. H. Thiemens, and W. C. Trogler (1999), Large mass independent sulfur isotope fractionations during the photopo- lymerization of 12 CS 2 and 13 CS 2 , J. Phys. Chem. A, 103(15), 13-16.

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Authors
Ono, S., Whitehill, A. R., & Lyons, J. R.
Affiliations
  • Massachusetts Institute of Technology (US)
  • University of California, Los Angeles (US)
Corresponding author
Ono, S.
Venue
Journal of Geophysical Research Atmospheres
Published
2013-03-12
Volume
118
Issue
5
Pages
2444-2454
ISSN
  • 0148-0227 (ISSN-L)
  • 2169-897X
  • 2169-8996
OpenAlex
W1781086111
Cited by
103
References
67
Citations by year
2026: 7 · 2025: 4 · 2024: 4 · 2023: 2 · 2022: 16 · 2021: 5 · 2020: 11 · 2019: 14 · 2018: 11 · 2017: 10 · 2016: 5 · 2015: 5 · 2014: 8 · 2013: 1
FWCI
4.12
Type
journal article
Language
en
Open access
Locations
  • Journal of Geophysical Research Atmospheres (publishedVersion)
  • DSpace@MIT (Massachusetts Institute of Technology) (submittedVersion, cc-by-nc)
Topics
  • Physical Sciences › Earth and Planetary Sciences › Atmospheric Science › Atmospheric chemistry and aerosols
  • Physical Sciences › Earth and Planetary Sciences › Paleontology › Paleontology and Stratigraphy of Fossils
  • Physical Sciences › Earth and Planetary Sciences › Geophysics › Geological and Geochemical Analysis
Keywords
stratospheric sulfate aerosols, elemental sulfur, isotope fractionation, SO2 partial pressure, volcanic eruptions, sulfur isotopes

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