Japan Geoscience Union Meeting 2014

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[U-05_30AM2] Interrelation between Life, Water, Mineral, and Atmosphere

Wed. Apr 30, 2014 11:00 AM - 12:45 PM 419 (4F)

Convener:*Tsubasa Otake(Division of Sustainable Resources Engineering, Faculty of Engineering, Hokkaido University), Yohey Suzuki(Graduate School of Science, The University of Tokyo), Fumito Shiraishi(Department of Earth and Planetary Systems Science, Graduate School of Science, Hiroshima University), Ken Takai(Extremobiosphere Research Center, Japan Agency for Marine-Earth Science & Technology), Yuichiro Ueno(Department of Earth and Planetary Sciences, Tokyo Institute of Technology), Takeshi Naganuma(Graduate School of Biosphere Science), Takeshi Kakegawa(Graduate School of Science, Tohoku University), Tadashi Yokoyama(Department of Earth and Space Science, Graduate School of Science, Osaka University), Kentaro Nakamura(Precambrian Ecosystem Laboratory (PEL), Japan Agency for Marine-Earth Science and Technology (JAMSTEC)), Chair:Tadashi Yokoyama(Department of Earth and Space Science, Graduate School of Science, Osaka University), Kentaro Nakamura(Precambrian Ecosystem Laboratory (PEL), Japan Agency for Marine-Earth Science and Technology (JAMSTEC))

11:30 AM - 11:45 AM

[U05-07] Archean Atmospheres Modeled with the KROME Chemistry Package

*Sebastian DANIELACHE1, Yuichiro UENO2, Eugenio SIMONCINI3 (1.Sophia University, Faculty of Science & Technology, Department of Materials and Life Sciences, 2.Earth & Planetary Sciences, Tokyo Institute of Technology, 3.INAF, Astrophysical Observatory of Arcetri, Italy.)

Keywords:Archean Atmosphere, Sulphur, Stable Isotopes

Sulfur isotopic fractionation has been used as a tool to understand the composition of reducing atmospheres. Our previous work (Danielache et al., 2008 and 2012) have shown that UV-light triggers a large Sulfur Mass-Independent Fractionation (S-MIF) on the SO2 photodissociation products. However photodissociation of unshielded UV-light alone cannot reproduce the S-MIF signals reported for the Archean and Early Proterozoic (>2300 Ma) nor its large variability mainly at 2600 Ma (D33S = +11‰) (Johnston, 2011). In order to study a planetary-like chemical network capable of accounting for a sulfur cycle in reducing conditions we have introduced a high-order solver (DLSODES) administrated by the KROME (Grassi et al.,) chemistry package. The package automatically generates a set of FORTRAN subroutines with build-in rate equations and solves them with accuracy and e?ciency for sparse networks. This technique allows us to couple a detailed 4 sulfur isotopes chemistry to a 1D transport model capable of calculating the opacities influencing photochemistry and the temperature structure of an Archean atmosphere. We present preliminary results showing the ability of the code to deal with small isotopic fractionations and compare with already existing model studies of the Archean atmosphere. Danielache, S. O., et al., (2008), High-precision spectroscopy of 32S, 33S, and 34S sulfur dioxide: Ultraviolet absorption cross sections and isotope effects, J. Geophys. Res., 113(D17), D17314, Danielache, S. O., et al., (2012), Photoabsorption cross-section measurements of 32S, 33S, 34S, and 36S sulfur dioxide for the B1B1-X1A1 absorption band, J. Geophys. Res. Atmos., 117(D24), Johnston, D. T. (2011), Multiple sulfur isotopes and the evolution of Earth's surface sulfur cycle, Earth Science Review., 106(1-2), 161-183.Grassi T., et al., (2014), KROME - a package to embed chemistry in astrophysical simulations, Monthly Notices of the Royal Astronomical Society., DOI: 10.1093/mnras/stu114 (arXiv:1311.1070 [astro-ph.GA]).