期刊
PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA
卷 106, 期 35, 页码 14784-14789出版社
NATL ACAD SCIENCES
DOI: 10.1073/pnas.0903518106
关键词
mass independent fractionation; carbonyl sulfide (OCS); sulfur dioxide (SO2); photochemistry; greenhouse gases
资金
- Tokyo Institute of Technology
- Ministry of Education, Culture, Sports, Technology and Science, Japan
- Global Environment Research Fund [B-094]
- KAKENHI [19740310]
Distributions of sulfur isotopes in geological samples would provide a record of atmospheric composition if the mechanism producing the isotope effects could be described quantitatively. We determined the UV absorption spectra of (SO2)-S-32, (SO2)-S-33, and (SO2)-S-34 and use them to interpret the geological record. The calculated isotopic fractionation factors for SO2 photolysis give mass independent distributions that are highly sensitive to the atmospheric concentrations of O-2, O-3, CO2, H2O, CS2, NH3, N2O, H2S, OCS, and SO2 itself. Various UV-shielding scenarios are considered and we conclude that the negative Delta S-33 observed in the Archean sulfate deposits can only be explained by OCS shielding. Of relevant Archean gases, OCS has the unique ability to prevent SO2 photolysis by sunlight at lambda > 202 nm. Scenarios run using a photochemical box model show that ppm levels of OCS will accumulate in a CO-rich, reducing Archean atmosphere. The radiative forcing, due to this level of OCS, is able to resolve the faint young sun paradox. Further, the decline of atmospheric OCS may have caused the late Archean glaciation.
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