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Her dark materials

机译:她的黑暗物质

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摘要

A glitch in the history of sulphur isotopes could imply that methane emitted by the ancient biosphere created a high-altitude photochemical smog, which governed the climate in a distinctly Gaian way. Free oxygen became abundant in Earth's atmosphere around 2.3 billion years ago, a change that was preceded or accompanied by at least three major ice ages. These ice ages themselves occurred immediately after an abrupt change in the relative abundance of isotopes of sulphur in sedimentary rocks around 2.46 billion years ago. The sulphur isotopes indicate that the photochemistry of the atmosphere altered dramatically, and the cold climate suggests that a major greenhouse gas, probably methane, had been removed. A somewhat similar pattern in the sulphur isotope record half a billion years earlier was reported recently, also associated with an ice age, and it has been suggested that this might indicate that there had been a transient period of high atmospheric oxygen.
机译:硫同位素历史上的小故障可能意味着古代生物圈排放的甲烷产生了高空光化学烟雾,以明显的盖安式方式控制了气候。大约23亿年前,地球大气中的游离氧变得很丰富,这一变化是在至少三个主要冰期之前或之后发生的。这些冰河时代本身发生在大约24.6亿年前的沉积岩中硫同位素的相对丰度突然变化之后。硫同位素表明,大气的光化学发生了巨大变化,而寒冷的气候表明,主要的温室气体(可能是甲烷)已被清除。最近报道了十亿年前硫同位素记录中的某种相似模式,也与冰河时期有关,并且有人暗示这可能表明存在一个短暂的大气高氧时期。

著录项

  • 来源
    《Nature》 |2008年第7200期|p.41-42|共2页
  • 作者

    Kevin Zahnle;

  • 作者单位

    The Section of Integrative Biology, University of Texas at Austin, Austin, Texas 78712, USA;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);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 自然科学总论;
  • 关键词

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