Neodymium isotope evidence for glacial-interglacial variability of deepwater transit time in the Pacific Ocean.
Neodymium isotope evidence for glacial-interglacial variability of deepwater transit time in the Pacific Ocean.
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DOI：
10.1038/s41467-018-07079-z
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发表时间：
2018-11-09
影响因子：
16.6
通讯作者：
Piotrowski AM
中科院分区：
文献类型：
--
作者：
Hu R;Piotrowski AM
有证据表明，冰川深处的太平洋存在更大的碳储量，但尚不确定这是否由通风、循环和生物生产力的变化造成。太平洋深海ε-ND的空间演化提供了关于深水中转时间的信息。7个新的有孔虫ε-ND记录系统地约束了深太平洋翻转过程中冰川到间冰期的变化，太平洋在空间上出现了两种不同的ε-ND演化模式，冰川中经向ε-ND梯度减小，表明深太平洋翻转环流速度更快。这意味着，据信发生在大西洋深处的由于环流迟缓而导致的更大的冰川碳储存，在太平洋并没有以类似的方式运行。其他机制，如生物泵效率提高和高纬度海气交换不佳，可能是导致冰川太平洋碳储量增加的原因。深海太平洋翻转对冰期-间冰期气候变化的反应仍存在争议。在这里，作者们展示了在最近的冰川时期，基于在有孔虫中记录的Nd同位素的新应用，通常更快的深太平洋倾覆。
There is evidence for greater carbon storage in the glacial deep Pacific, but it is uncertain whether it was caused by changes in ventilation, circulation, and biological productivity. The spatial εNd evolution in the deep Pacific provides information on the deepwater transit time. Seven new foraminiferal εNd records are presented to systematically constrain glacial to interglacial changes in deep Pacific overturning and two different εNd evolution regimes occur spatially in the Pacific with reduced meridional εNd gradients in glacials, suggesting a faster deep Pacific overturning circulation. This implies that greater glacial carbon storage due to sluggish circulation, that is believed to have occurred in the deep Atlantic, did not operate in a similar manner in the Pacific Ocean. Other mechanisms such as increased biological pump efficiency and poor high latitude air-sea exchange could be responsible for increased carbon storage in the glacial Pacific. The response of deep Pacific overturning to glacial-interglacial climate change is still debated. Here the authors show a generally faster deep Pacific overturning operated in recent glacial periods based on a novel application of Nd isotopes recorded in foraminifera.
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