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首页> 外文期刊>Paleoceanography >A Synthesis of Deglacial Deep-Sea Radiocarbon Records and Their (In)Consistency With Modern Ocean Ventilation
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A Synthesis of Deglacial Deep-Sea Radiocarbon Records and Their (In)Consistency With Modern Ocean Ventilation

机译：具有现代海洋通风的近海覆盖碳记录及其（in）贯通的合成

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摘要

We present a synthesis of 1,361 deep-sea radiocarbon data spanning the past 40 kyr and computed (for ~(14)C-dated records) from the same calibration to atmospheric ~(14)C. The most notable feature in our compilation is a long-term Δ~(14)C decline in deep oceanic basins over the past 25 kyr. The Δ~(14)C decline mirrors the drop in reconstructed atmospheric Δ~(14)C, suggesting that it may reflect a decrease in global ~(14)C inventory rather than a redistribution of ~(14)C among different reservoirs. Motivated by this observation, we explore the extent to which the deep water Δ~(14)C data jointly require changes in basin-scale ventilation during the last deglaciation, based on the fit of a 16-box model of modern ocean ventilation to the deep water Δ~(14)C records. We find that the fit residuals can largely be explained by data uncertainties and that the surface water Δ~(14)C values producing the fit are within the bounds provided by contemporaneous values of atmospheric and deep water Δ~(14)C. On the other hand, some of the surface Δ~(14)C values in the northern North Atlantic and the Southern Ocean deviate from the values expected from atmospheric ~(14)CO_2 and CO_2 concentrations during the Heinrich Stadial 1 and the B?lling-Aller?d. The possibility that deep water Δ~(14)C records reflect some combination of changes in deep circulation and surface water reservoir ages cannot be ruled out and will need to be investigated with a more complete model.
机译：我们介绍了跨越40kyr的1,361个深海无线电碳数据的合成，并计算（用于〜（14）C次记录）与大气〜（14）C的校准。我们编译中最值得注意的功能是过去25 kyr的深海盆地中的长期δ〜（14）C。 δ〜（14）C下降反映了重建的大气δ〜（14）C中的下降，表明它可能反映了全局〜（14）C库存的减少，而不是不同水库中的〜（14）C的再分配。通过这种观察，我们探讨了深水δ〜（14）C数据的程度，基于一个16盒现代海洋通风的16盒模型的适用性，在最后的嗜好期间，深水δ〜（14）C数据在最后的渐变期间的盆地级通风中的变化深水δ〜（14）C记录。我们发现拟合残留物可以很大程度上通过数据不确定性来解释，并且产生拟合的表面水δ〜（14）C值在大气和深水δ〜（14）C的同期提供的界限内。另一方面，北部北大西洋和南海北部的一些表面δ〜（14）C值偏离了海因里希1和B？流动期间来自大气〜（14）CO_2和CO_2浓度的值 - 适用？D。深水δ〜（14）C记录的可能性反映了深度循环和表面水库时代的一些变化的组合，不能排除，并且需要用更完整的模型进行调查。

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  • 来源
    《Paleoceanography》 |2018年第2期|共24页
  • 作者

    Ning Zhao; Olivier Marchal; Lloyd Keigwin; Daniel Amrhein; Geoffrey Gebbie;

  • 作者单位

    Massachusetts Institute of Technology-Woods Hole Oceanographic Institution Joint Program in Oceanography Woods Hole MA USA;

    Department of Geology and Geophysics Woods Hole Oceanographic Institution Woods Hole MA USA;

    Department of Geology and Geophysics Woods Hole Oceanographic Institution Woods Hole MA USA;

    School of Oceanography and Department of Atmospheric Sciences University of Washington Seattle WA USA;

    Department of Physical Oceanography Woods Hole Oceanographic Institution Woods Hole MA USA;

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

    A Synthesis; Deglacial Deep-Sea; Radiocarbon Records;

    机译：合成;冥想深海;radiocarbon记录;

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