Changes in the circulation of the Southern Ocean are known to have impacted global nutrient, heat, and carbon cycles during the glacial and interglacial periods of the late Pleistocene. Proxy-based records of these changes deserve continued scrutiny as the implications may be important for constraining future change. A record of authigenic uranium from the South Atlantic has been used to infer changes in deep-sea oxygenation and organic matter export over the past 0.5 million years. Since sedimentary uranium has the possible complication of remobilization, it is prudent to investigate the behavior of other redox-sensitive trace metals to confidently interpret temporal changes in oxygenation. Focusing here on the exceptionally long interglacial warm period, Marine Isotope Stage (MIS) 11, we found concurrent authigenic enrichments of uranium (U) and rhenium (Re) throughout MIS 12 to 10, overall supporting prior interpretations of low-oxygen periods. However, there are differential responses of Re and U to oxygen changes and some evidence of small-scale Re remobilization, which may involve differences in molecular-level reduction mechanisms. Peaks in authigenic manganese (Mn) intervening with peaks in Re and U indicate increases in porewater oxygenation which likely relate to increased Antarctic Bottom Water circulation at the onset of MIS11c and during the peak warmth of the interglacial around 400 ka.

中文翻译：

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从海洋同位素第 11 阶段对氧化还原敏感的痕量金属推断出的南大洋氧化变化

众所周知，南大洋环流的变化影响了晚更新世冰期和间冰期的全球养分、热量和碳循环。这些变化的基于代理的记录值得继续审查，因为其影响可能对限制未来的变化很重要。来自南大西洋的自生铀记录已被用于推断过去 50 万年来深海氧化和有机物质出口的变化。由于沉积铀可能存在再动员并发症，因此谨慎地研究其他对氧化还原敏感的痕量金属的行为，以自信地解释氧合的时间变化。此处关注异常漫长的间冰期暖期，海洋同位素阶段 (MIS) 11，我们在整个 MIS 12 到 10 期间发现了铀（U）和铼（Re）的并发自生富集，总体上支持了先前对低氧期的解释。然而，Re 和 U 对氧变化的反应不同，并且有一些小规模 Re 再动员的证据，这可能涉及分子水平还原机制的差异。自生锰 (Mn) 的峰值与 Re 和 U 的峰值之间的干扰表明孔隙水氧合增加，这可能与 MIS11c 开始时和 400 ka 左右的间冰期峰值温暖期间南极底水循环增加有关。这可能涉及分子水平还原机制的差异。自生锰 (Mn) 的峰值与 Re 和 U 的峰值之间的干扰表明孔隙水氧合增加，这可能与 MIS11c 开始时和 400 ka 左右的间冰期峰值温暖期间南极底水循环增加有关。这可能涉及分子水平还原机制的差异。自生锰 (Mn) 的峰值与 Re 和 U 的峰值之间的干扰表明孔隙水氧合增加，这可能与 MIS11c 开始时和 400 ka 左右的间冰期峰值温暖期间南极底水循环增加有关。