Absorption spectra measurements at ~1 cm&lt;sup&gt;–1&lt;/sup&gt; spectral resolution of &lt;sup&gt;32&lt;/sup&gt;S, &lt;sup&gt;33&lt;/sup&gt;S, &lt;sup&gt;34&lt;/sup&gt;S, and &lt;sup&gt;36&lt;/sup&gt;S sulfur dioxide for the 206–220 nm region and applications to modeling of the isotopic self-shielding

Endo, Yoshiaki; Danielache, Sebastian O.; Ogawa, Moeko; Ueno, Yuichiro

doi:10.2343/geochemj.gj22004

Cited by 7 publications

(3 citation statements)

References 75 publications

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“…A 10) where the variation of the isotopic signal changes over time expressed at the 33 E/ 36 E space. During the preparation of this paper Endo and co-workers (Endo et al, 2022) have reported 32,33,34,36 SO2 high resolution UV absorption spectra in the 206-220 nm region. A detailed study on the incidence of spectral resolution coupled to spectral errors, spectral range, and variability of the solar spectra deserves a substantial amount of work that would render this paper exceedingly long.…”

Section: Photodissociation Of So 2 -So System and Their Associated Is...mentioning

confidence: 90%

Introducing atmospheric photochemical isotopic processes to the PATMO atmospheric code

et al. 2023

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The study of production and depletion of chemical species is vital for the understanding of composition and evolution of planetary atmospheres. We present an implementation of photoinduced isotopic effects into the PATMO code (Ávila et al., 2021) code designed for the study of stable isotopes and photo-induced isotopic effects. With respect to the original code PATMO, where the photochemistry was not included, this report extends capability of the model to set photochemical processes for stable isotopes and thus enhancing its applicability. The PATMO code is flexible and allows the edition of new chemical reactions without need for hard code them. We also test how changes in spectral resolution affects the calculation of isotopic effects during the photodissociation of oxygen. We found that for a highly structured spectrum such as the Schumann-Runge band a spectral resolution larger than 0.005 nm is necessary for accurately modeling these isotopic effects. We also show that SO2 and SO photodissociation couples in a complex shielding fashion and significantly affects the photo-induced isotopic effects. The model was also benchmarked against today's Earth atmosphere, where the solar UV flux and the ozone profile of the US Standard atmosphere of 1976 was reproduced with the simple Chapman mechanism and improved with the implementation of NOx and HOx radicals.

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Section: Photodissociation Of So 2 -So System and Their Associated Is...mentioning

confidence: 90%

Introducing atmospheric photochemical isotopic processes to the PATMO atmospheric code

et al. 2023

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“…Additional products are organic compounds and residual SO 2 that may also be MIF‐bearing (see detailed review by Halevy, 2013). Also, self‐shielding of the SO 2 molecule during photolysis and polymerization reactions between the products may play a role in controlling the final distribution of isotopic compositions (Endo et al., 2022; Harman et al., 2018). These atmospheric species are rained out and are buried in sediments as sulfide and sulfate minerals, organic sulfur compounds or elemental sulfur.…”

Section: Introductionmentioning

confidence: 99%

Evaluating the multiple sulfur isotope signature of Eoarchean rocks from the Isua Supracrustal Belt (Southwest‐Greenland) by MC‐ICP‐MS: Volcanic nutrient sources for early life

Macdonald,

Sugden,

Dumont

et al. 2024

Geobiology

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On the anoxic Archean Earth, prior to the onset of oxidative weathering, electron acceptors were relatively scarce, perhaps limiting microbial productivity. An important metabolite may have been sulfate produced during the photolysis of volcanogenic SO2 gas. Multiple sulfur isotope data can be used to track this sulfur source, and indeed this record indicates SO2 photolysis dating back to at least 3.7 Ga, that is, as far back as proposed evidence of life on Earth. However, measurements of multiple sulfur isotopes in some key strata from that time can be challenging due to low sulfur concentrations. Some studies have overcome this challenge with NanoSIMS or optimized gas‐source mass spectrometry techniques, but those instruments are not readily accessible. Here, we applied an aqua regia leaching protocol to extract small amounts of sulfur from whole rocks for analyses of multiple sulfur isotopes by multi‐collector inductively coupled plasma mass spectrometry (MC‐ICP‐MS). Measurements of standards and replicates demonstrate good precision and accuracy. We applied this technique to meta‐sedimentary rocks with putative biosignatures from the Eoarchean Isua Supracrustal Belt (ISB, >3.7 Ga) and found positive ∆33S (1.40–1.80‰) in four meta‐turbidites and negative ∆33S (−0.80‰ and −0.66‰) in two meta‐carbonates. Two meta‐basalts do not display significant mass‐independent fractionation (MIF, −0.01‰ and 0.16‰). In situ Re–Os dating on a molybdenite vein hosted in the meta‐turbidites identifies an early ca. 3.7 Ga hydrothermal phase, and in situ Rb–Sr dating of micas in the meta‐carbonates suggests metamorphism affected the rocks at ca. 2.2 and 1.7 Ga. We discuss alteration mechanisms and conclude that there is most likely a primary MIF‐bearing phase in these meta‐sediments. Our new method is therefore a useful addition to the geochemical toolbox, and it confirms that organisms at that time, if present, may indeed have been fed by volcanic nutrients.

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“…For evaluation of the impact in the Archean photochemistry by S 2 , it is essential to know which spectral window is free of competing absorbers. It is important to consider species that would be the directly emitted reactants by outgassing and volcanic eruptions: H 2 S , and SO 2 . − Their photolysis products have to be taken into account as well: SH and SO. , Two spectral windows are free from interference by these compounds and are of particular interest: 230–245 and 260–270 nm. At last, it should be noted that the trace gases in an anoxic atmosphere do not absorb light at these wavelengths, and S 2 is active in the sulfur photochemical cycle.…”

Section: Introductionmentioning

confidence: 99%

Potential Energy Curves and Ultraviolet Absorption Cross Sections of Sulfur Dimer

Sarka,

Nanbu

2023

ACS Earth Space Chem.

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Absorption spectra measurements at ~1 cm<sup>–1</sup> spectral resolution of <sup>32</sup>S, <sup>33</sup>S, <sup>34</sup>S, and <sup>36</sup>S sulfur dioxide for the 206–220 nm region and applications to modeling of the isotopic self-shielding

Cited by 7 publications

References 75 publications

Introducing atmospheric photochemical isotopic processes to the PATMO atmospheric code

Introducing atmospheric photochemical isotopic processes to the PATMO atmospheric code

Evaluating the multiple sulfur isotope signature of Eoarchean rocks from the Isua Supracrustal Belt (Southwest‐Greenland) by MC‐ICP‐MS: Volcanic nutrient sources for early life

Potential Energy Curves and Ultraviolet Absorption Cross Sections of Sulfur Dimer

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