The oxygen concentrations of oceanic deep-water and atmospheric carbon dioxide ( p CO 2 ) are intrinsically linked through organic carbon remineralization and storage as dissolved inorganic carbon in the deep sea. We present a high-resolution reconstruction of relative changes in oxygen concentration in the deep North Atlantic for the past 1.5 million years using the carbon isotope gradient between epifaunal and infaunal benthic foraminifera species as a proxy for paleo-oxygen. We report a significant (>40 micromole per kilogram) reduction in glacial Atlantic deep-water oxygenation at ~960 thousand to 900 thousand years ago that coincided with increased continental ice volume and a major change in ocean thermohaline circulation. Paleo-oxygen results support a scenario of decreasing deep-water oxygen concentrations, increased respired carbon storage, and a reduction in glacial p CO 2 across the Middle Pleistocene Transition.

中文翻译：

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中更新世过渡时期北大西洋深水氧合的变化

海洋深水和大气二氧化碳的氧浓度（p一氧化碳2) 通过有机碳再矿化和作为溶解在深海中的无机碳储存而具有内在联系。我们使用动物和动物底栖有孔虫物种之间的碳同位素梯度作为古氧的代表，对过去 150 万年北大西洋深处氧浓度的相对变化进行了高分辨率重建。我们报告了大约 96 万至 90 万年前冰川大西洋深水氧合显着减少（> 40 微摩尔/千克），这与大陆冰量增加和海洋温盐环流的重大变化相吻合。古氧结果支持降低深水氧浓度、增加呼吸碳储存和冰川减少的情景p一氧化碳2横跨中更新世过渡期。