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Early Cenozoic Decoupling of Climate and Carbonate Compensation Depth Trends

机译：早期新生代气候去耦合碳酸盐补偿深度趋势

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摘要

Our understanding of the long-term evolution of the Earth system is based on the assumption that terrestrial weathering rates should respond to, and hence help regulate, atmospheric CO_2 and climate. Increased terrestrial weathering requires increased carbonate accumulation in marine sediments, which in turn is expected to result in a long-term deepening of the carbonate compensation depth (CCD). Here, we critically assess this long-term relationship between climate and carbon cycling. We generate a record of marine deep-sea carbonate abundance from selected late Paleocene through early Eocene time slices to reconstruct the position of the CCD. Although our data set allows for a modest CCD deepening, we find no statistically significant change in the CCD despite >3 °C global warming, highlighting the need for additional deep-sea constraints on carbonate accumulation. Using an Earth system model, we show that the impact of warming and increased weathering on the CCD can be obscured by the opposing influences of ocean circulation patterns and sedimentary respiration of organic matter. From our data synthesis and modeling, we suggest that observations of warming, declining δ13C and a relatively stable CCD can be broadly reproduced by mid-Paleogene increases in volcanic CO_2 outgassing and weathering. However, remaining data-model discrepancies hint at missing processes in our model, most likely involving the preservation and burial of organic carbon. Our finding of a decoupling between the CCD and global marine carbonate burial rates means that considerable care is needed in attempting to use the CCD to directly gauge global carbonate burial rates and hence weathering rates.
机译：我们对地球系统长期演化的理解是基于这样一个假设，即地球风化速率应该对大气CO_2和气候做出反应，从而帮助调节大气CO_2和气候。陆地风化作用的增加需要增加海洋沉积物中的碳酸盐积累，这反过来会导致碳酸盐补偿深度（CCD）的长期加深。在这里，我们批判性地评估了气候和碳循环之间的长期关系。我们生成了从选定的古新世晚期到始新世早期的海洋深海碳酸盐丰度记录，以重建CCD的位置。尽管我们的数据集允许适度加深CCD，但我们发现，尽管全球变暖>3°C，CCD在统计上没有显著变化，这突出表明需要对碳酸盐堆积施加额外的深海限制。利用地球系统模型，我们表明，变暖和风化加剧对CCD的影响可以被海洋环流模式和有机质沉积呼吸的相反影响所掩盖。从我们的数据合成和建模中，我们认为，通过古近纪中期火山CO_2脱气和风化的增加，可以广泛再现变暖、δ13C下降和相对稳定的CCD观测。然而，剩余的数据模型差异暗示我们的模型中缺少过程，很可能涉及有机碳的保存和埋藏。我们发现CCD和全球海洋碳酸盐埋藏率之间存在脱钩，这意味着在尝试使用CCD直接测量全球碳酸盐埋藏率和风化率时需要相当谨慎。

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  • 来源
    《Paleoceanography》 |2019年第6期|共16页
  • 作者

    S. E. Greene; A. Ridgwell; S. Kirtland Turner; D. N. Schmidt; H. P?like; E. Thomas; L. K. Greene; B. A. A. Hoogakker;

  • 作者单位

    School of Geography Earth and Environmental Sciences University of Birmingham Birmingham UK;

    BRIDGE School of Geographical Sciences University of Bristol Bristol UK;

    Department of Earth Sciences University of California at Riverside Riverside CA USA;

    School of Earth Sciences University of Bristol Bristol UK;

    MARUM-Center for Marine Environmental Sciences University of Bremen Bremen Germany;

    Department of Geology and Geophysics Yale University New Haven CT USA;

    University Program in Ecology Duke University Durham NC USA;

    Institute of Life and Earth Sciences Heriot Watt University Edinburgh UK;

  • 收录信息
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 海洋学;
  • 关键词

    Early Cenozoic; Decoupling of; Climate and Carbonate;

    机译：早期新生代;去耦;气候和碳酸盐;

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