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首页> 外文期刊>Paleoceanography >Inferring surface water equilibrium calcite delta O-18 during the last deglacial period from benthic foraminiferal records: Implications for ocean circulation
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Inferring surface water equilibrium calcite delta O-18 during the last deglacial period from benthic foraminiferal records: Implications for ocean circulation

机译：从底栖有孔虫记录推断最后一个冰消期的地表水平衡方解石δO-18：对海洋环流的影响

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摘要

The ocean circulation modifies mixed layer (ML) tracer signals as they are communicated to the deep ocean by advection and mixing. We develop and apply a procedure for using tracer signals observed "upstream" (by planktonic foraminifera) and "downstream" (by benthic foraminifera) to constrain how tracer signals are modified by the intervening circulation and, by extension, to constrain properties of that circulation. A history of ML equilibrium calcite delta O-18 (delta O-18(c)) spanning the last deglaciation is inferred from a least-squares fit of eight benthic foraminiferal delta O-18(c) records to Green's function estimated for the modern ocean circulation. Disagreements between this history and the ML history implied by planktonic records would indicate deviations from the modern circulation. No deviations are diagnosed because the two estimates of ML delta O-18(c) agree within their uncertainties, but we suggest data collection and modeling procedures useful for inferring circulation changes in future studies. Uncertainties of benthic-derived ML delta O-18(c) are lowest in the high-latitude regions chiefly responsible for ventilating the deep ocean; additional high-resolution planktonic records constraining these regions are of particular utility. Benthic records from the Southern Ocean, where data are sparse, appear to have the most power to reduce uncertainties in benthic-derived ML delta O-18(c). Understanding the spatiotemporal covariance of deglacial ML delta O-18(c) will also improve abilities of delta O-18(c) records to constrain deglacial circulation.
机译：当海洋对流层通过平流和混合传递到深海时，海洋环流会修改混合层（ML）示踪信号。我们开发并应用了一种程序，以使用在“上游”（通过浮游有孔虫）和“下游”（通过底栖有孔虫）观察到的示踪信号来约束示踪信号如何通过中间循环进行修改，并通过扩展来限制该循环的性质。 ML平衡方解石三角洲O-18（三角洲O-18（c））跨越最后一次冰消的历史可以从八个底栖有孔虫三角洲O-18（c）记录的最小二乘拟合推算出格林对现代函数的估计海洋环流。该历史与浮游记录所暗示的ML历史之间的分歧将表明与现代循环的背离。由于ML delta O-18（c）的两个估计在其不确定性内一致，因此未诊断出偏差，但我们建议数据收集和建模程序可用于推断未来的研究中的循环变化。在主要负责深海通风的高纬度地区，底栖动物产的ML三角洲O-18（c）的不确定性最低。约束这些区域的其他高分辨率浮游记录特别有用。来自南大洋的海底记录（数据稀少）似乎最有力降低底栖动物来源的ML三角洲O-18（c）的不确定性。理解冰河ML三角洲O-18（c）的时空协方差还将提高三角洲O-18（c）记录约束冰河环流的能力。

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