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首页> 外文期刊>Paleoceanography >Paleosensitivity of Hydrogen Isotope Ratios of Long-Chain Alkenones to Salinity Changes at the Chile Margin
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Paleosensitivity of Hydrogen Isotope Ratios of Long-Chain Alkenones to Salinity Changes at the Chile Margin

机译：智利边缘盐度长链烯烃的氢同位素比率的古代敏感性

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摘要

Hydrogen isotope ratios of long-chain alkenones (δ_2HC_(37) ratios) have been shown to correlate with salinity in several culture studies. However, it is uncertain how applicable the δ_2HC_(37)-salinity relationship is to reconstruct past salinity. The δ_2HC_(37) ratios were measured on sediments from a drill core (ODP site 1234) at the Chilean Margin covering the last ~150 kyr. High δ_2HC_(37) values corresponded to glacial time periods and interglacial periods are characterized by lower δ_2HC_(37) values, aligning with δ18O ratios measured on planktonic foraminifera from the same core. Effects of parameters such as species composition, the δ~2H-δ~(18)O relationship used for ice volume corrections, and nutrient- or light-controlled growth rate, did not appear to significantly alter δ_2HC_(37) ratios at ODP 1234. We used linear regression equations from batch culture experiments, marine surface sediments, and suspended particulate organic matter to quantitatively characterize salinity changes over the last ~150 kyr at ODP 1234. However, most of these equations yielded larger salinity shifts than previously suggested, a phenomenon also observed for other δ_2HC_(37) records. This suggests that the paleosensitivity of δ_2HC_(37) ratios to salinity was larger in the geologic record than has been observed in any modern environment or laboratory settings, or that glacial to interglacial salinity shifts might have been larger than currently believed.
机译：在一些培养研究中，长链烯烃的氢同位素比值（δ2HC_37）已被证明与盐度相关。然而，目前尚不确定δ2HC_37-盐度关系如何适用于重建过去的盐度。δ2HC_37比值是在智利边缘一个钻孔（ODP 1234）的沉积物上测量的，该钻孔覆盖了最后150 kyr。与冰川期和间冰期相对应的高δ2HC_37值以较低的δ2HC_37值为特征，与同一岩芯浮游有孔虫的δ18O比值一致。物种组成、用于冰体积修正的δ~2H-δ~（18）O关系以及营养或光控生长速率等参数的影响似乎没有显著改变ODP1234处的δ2HC_37比值。我们利用分批培养实验、海洋表层沉积物和悬浮颗粒有机物的线性回归方程，定量描述了ODP1234在过去150 kyr的盐度变化。然而，这些方程中的大多数产生了比之前建议的更大的盐度变化，这一现象也在其他δ2HC_37记录中观察到。这表明，地质记录中δ2HC_37比值对盐度的古敏感性比在任何现代环境或实验室环境中观察到的都大，或者冰川到间冰期盐度的变化可能比目前认为的更大。

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  • 来源
    《Paleoceanography》 |2019年第6期|共12页
  • 作者

    G. M. Weiss; M. W. de Bar; D. J. Stolwijk; S. Schouten; J. S. Sinninghe Damsté; M. T. J. van der Meer;

  • 作者单位

    NIOZ Royal Netherlands Institute for Sea Research Department of Marine Microbiology and Biogeochemistry and Utrecht University Den Burg The Netherlands;

    NIOZ Royal Netherlands Institute for Sea Research Department of Marine Microbiology and Biogeochemistry and Utrecht University Den Burg The Netherlands;

    NIOZ Royal Netherlands Institute for Sea Research Department of Marine Microbiology and Biogeochemistry and Utrecht University Den Burg The Netherlands;

    NIOZ Royal Netherlands Institute for Sea Research Department of Marine Microbiology and Biogeochemistry and Utrecht University Den Burg The Netherlands;

    NIOZ Royal Netherlands Institute for Sea Research Department of Marine Microbiology and Biogeochemistry and Utrecht University Den Burg The Netherlands;

    NIOZ Royal Netherlands Institute for Sea Research Department of Marine Microbiology and Biogeochemistry and Utrecht University Den Burg The Netherlands;

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

    Paleosensitivity; Hydrogen Isotope; Ratios of Long-Chain;

    机译：古敏感;氢同位素;长链的比率;

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