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Persistent East Equatorial Pacific Carbon Storage at the Middle Pleistocene Transition

机译：持久的东赤道太平洋碳储存在中间更新世过渡

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The Middle Pleistocene Transition (MPT, ~641-920 ka) represents a period of the Quaternary climate when, in the absence of substantial changes in orbital forcing, the climate progressively shifted to the 100 ka asymmetrical glacial-interglacial cyclicity characterizing the current climate. The causes of this change remain still uncertain but several lines of evidence suggested the carbon storage of the deep ocean played a relevant role. Here we evaluate the contribution of the eastern deep tropical Pacific to the global ocean carbon sequestration and storage between 760 and 1,040 ka. We present multi-proxy records for export production and the redox environment at the seabed from Ocean Drilling Program Site 1242 located in the deep East Equatorial Pacific. Our data indicate the development of suboxic bottom waters during early marine isotopic stage (MIS) 23 and glacial MIS 22, suggesting the capture and storage of respired carbon. Redox-sensitive elements suggest the progressive oxygenation of the deep ocean initiated at the end of the glacial MIS 22, continued across deglaciation and ended with the accomplishment of full interglacial MIS 21. We describe this pattern as a "less complete deglacial ventilation" in that it differs from the mid-late Pleistocene Pacific deep ocean ventilation pattern which occurs during deglaciations. The ventilation of the deep Pacific Ocean extending beyond deglaciation might have contributed to a persistent deep ocean carbon sequestration, which might have resulted in lowered atmospheric CO_2 values that could have influenced the internal response of the climate system contributing to the development of the 100 ka climate variability.
机译：中更新世过渡期（MPT，~641-920 ka）代表了第四纪气候的一个时期，在轨道强迫没有实质性变化的情况下，气候逐渐转变为100 ka不对称冰期-间冰期旋回，这是当前气候的特征。这种变化的原因仍然不确定，但有几条证据表明，深海的碳储存起到了相关作用。在这里，我们评估了热带太平洋东部在760到1040千卡之间对全球海洋碳固存和储存的贡献。我们展示了位于赤道太平洋东南部的海洋钻探项目1242号现场的出口生产和海底氧化还原环境的多代理记录。我们的数据表明，在早期海洋同位素阶段（MIS）23和冰川MIS 22期间，亚毒性底水的发育，表明呼吸碳的捕获和储存。氧化还原敏感元素表明，深海的渐进氧化作用始于冰期MIS 22末期，持续到冰消期，并以完全间冰期MIS 21结束。我们将这种模式描述为“不完全的冰消通风”，因为它不同于在冰消期间发生的中-晚更新世太平洋深海通风模式。除冰消作用以外的深太平洋通风可能导致持续的深海碳固存，这可能导致大气CO_2值降低，从而影响气候系统的内部响应，从而导致100 ka气候变化的发展。

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