...
首页> 外文期刊>Proceedings of the National Academy of Sciences of the United States of America >Geological sulfur isotopes indicate elevated OCS in the Archean atmosphere, solving faint young sun paradox
【24h】

Geological sulfur isotopes indicate elevated OCS in the Archean atmosphere, solving faint young sun paradox

机译:地质硫同位素表明,古宙大气中的OCS升高,解决了淡淡的年轻太阳悖论

获取原文
获取原文并翻译 | 示例
           

摘要

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 ~(32)SO_2, ~(33)SO_2, and ~(34)SO_2 and use them to interpret the geological record. The calculated isotopic fractionation factors for SO_2 photolysis give mass independent distributions that are highly sensitive to the atmospheric concentrations of O_2, O_3, CO_2, H_2O, CS_2, NH_3, N_2O, H_2S, OCS, and SO_2 itself. Various UV-shielding scenarios are considered and we conclude that the negative Δ~(33)S observed in the Archean sulfate deposits can only be explained by OCS shielding. Of relevant Archean gases, OCS has the unique ability to prevent SO_2 photolysis by sunlight at λ >202nm. 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.
机译:如果可以定量描述产生同位素效应的机理,那么地质样品中硫同位素的分布将提供大气成分的记录。我们确定了〜(32)SO_2,〜(33)SO_2和〜(34)SO_2的紫外吸收光谱,并用它们来解释地质记录。计算出的SO_2光解同位素分馏因子给出了与质量无关的分布,这些分布对O_2,O_3,CO_2,H_2O,CS_2,NH_3,N_2O,H_2S,OCS和SO_2本身的大气浓度高度敏感。考虑到各种紫外线屏蔽情况,我们得出的结论是,在太古硫酸盐矿床中观察到的负Δ〜(33)S只能用OCS屏蔽来解释。在相关的太古代气体中,OCS具有防止λ> 202nm的阳光对SO_2进行光解的独特能力。使用光化学箱模型运行的场景显示,OCS的ppm水平将在富含CO的气体中积累,从而减少了太古代气。由于这种水平的OCS,辐射强迫能够解决微弱的年轻太阳悖论。此外,大气OCS的下降可能导致了太古宙冰川晚期。

著录项

  • 来源
  • 作者单位

    Global Edge Institute , Tokyo Institute of Technology, Meguro Tokyo, 152-8551, Japan Research Center for the Evolving Earth and Planet, Tokyo Institute of Technology, Meguro Tokyo, 152-8551, Japan;

    Copenhagen Center for Atmospheric Research, Department of Chemistry, University of Copenhagen, Universitetsparken 5 DK-2100 Copenhagen O,Denmark;

    Research Center for the Evolving Earth and Planet, Tokyo Institute of Technology, Meguro Tokyo, 152-8551, Japan Copenhagen Center for Atmospheric Research, Department of Chemistry, University of Copenhagen, Universitetsparken 5 DK-2100 Copenhagen O,Denmark Departments of Environmental Science and Technology , Tokyo Institute of Technology,G1-25, 4259 Nagatsuta, Yokohama, 226-8502, Japan;

    Copenhagen Center for Atmospheric Research, Department of Chemistry, University of Copenhagen, Universitetsparken 5 DK-2100 Copenhagen O,Denmark;

    Research Center for the Evolving Earth and Planet, Tokyo Institute of Technology, Meguro Tokyo, 152-8551, Japan Departments of Environmental Science and Technology , Tokyo Institute of Technology,G1-25, 4259 Nagatsuta, Yokohama, 226-8502, Japan;

    Research Center for the Evolving Earth and Planet, Tokyo Institute of Technology, Meguro Tokyo, 152-8551, Japan Departments of Environmental Science and Technology , Tokyo Institute of Technology,G1-25, 4259 Nagatsuta, Yokohama, 226-8502, Japan Environmental Chemistry and Engineering, Tokyo Institute of Technology,G1-25, 4259 Nagatsuta, Yokohama, 226-8502, Japan;

  • 收录信息 美国《科学引文索引》(SCI);美国《生物学医学文摘》(MEDLINE);美国《化学文摘》(CA);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    mass independent fractionation; carbonyl sulfide (OCS); sulfur dioxide (SO_2); photochemistry; greenhouse gases;

    机译:质量无关的分馏;羰基硫(OCS);二氧化硫(SO_2);光化学温室气体;

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱:kefu@zhangqiaokeyan.com

京公网安备:11010802029741号 ICP备案号:京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有
  • 客服微信

  • 服务号