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Evolution of the ocean's 'biological pump'

机译:海洋“生物泵”的演变

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摘要

Earth history is punctuated by a huge variety of transitions and perturbations in climate and global biogeochemical cycles. These may be linked to major extinctions or evolutionary innovations, and may ex hibit evidence for greenhouse warming and CO_2 release and hence potentially hold direct future-relevant information (1) or may be associated with ice ages. Argu ably, no event is more enigmatic or has been more keenly debated than the oc currence of extreme glaciation during the Neoproterozoic (1,000-542 Ma) (2), when, in two separate episodes, the global ocean potentially attained complete sea-ice cover to create a "snowball Earth" (3). One of the main barriers to a full understanding of these intense glacial episodes has been in identifying the trigger; as nothing com parable occurs at any time in the pre ceding approximately 1,500 Ma or afterward during the Phanerozoic.
机译:地球历史因气候和全球生物地球化学循环的各种转变和扰动而中断。这些可能与主要的灭绝或进化创新有关,并且可能是温室气体变暖和CO_2释放的证据,因此有可能持有与未来直接相关的信息(1)或与冰河时期有关。可以说,没有什么比新元古代(1,000-542 Ma)期间极端冰川的发生更令人难以置信或更具争议性的了(2),当时全球海洋在两个单独的事件中可能获得了完整的海冰封面以创建“雪球地球”(3)。全面了解这些强烈冰川事件的主要障碍之一是确定触发因素。因为在大约1500 Ma之前或之后的新生代,任何时候都没有可比的东西发生。

著录项

  • 来源
  • 作者

    Andy Ridgwell;

  • 作者单位

    Bristol Research Initiative for the Dynamic Global Environment, School of Geographical Sciences, University of Bristol, Bristol BS8 1SS. United Kinadom;

  • 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

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