Radiocarbon evidence for enhanced respired carbon storage in the Atlantic at the Last Glacial Maximum.
Radiocarbon evidence for enhanced respired carbon storage in the Atlantic at the Last Glacial Maximum.
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DOI：
10.1038/ncomms11998
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发表时间：
2016-06-27
影响因子：
16.6
通讯作者：
Hodell D
中科院分区：
文献类型：
--
作者：
Freeman E;Skinner LC;Waelbroeck C;Hodell D
海洋环流变化对大气CO2的影响主要取决于改变海洋内部呼吸营养物质存量的能力。在这里，我们调查的大西洋翻转流通在末次冰期最大和呼吸碳储量的影响，使用放射性碳和稳定的碳同位素数据从巴西和伊比利亚边缘。这些数据表明，存在一个浅的通风良好的北源细胞覆盖在通风不良，主要是南源细胞在末次冰盛期。我们还发现，在大西洋深处的有机碳矿化率仍然大致类似于现代，但在南方来源的翻转单元的通风年龄显着增加。因此，在最后一次冰期，大西洋深海的呼吸碳储存量增加，主要是由于碳在深海的停留时间增加，而不是生物碳输出增加。 大西洋翻转环流及其对冰期呼吸碳储存的影响仍然是一个谜。在这里，作者结合联合收割机放射性碳和稳定的碳同位素数据从巴西和伊比利亚边缘调查海洋环流和碳储存在末次冰盛期。
The influence of ocean circulation changes on atmospheric CO2 hinges primarily on the ability to alter the ocean interior's respired nutrient inventory. Here we investigate the Atlantic overturning circulation at the Last Glacial Maximum and its impact on respired carbon storage using radiocarbon and stable carbon isotope data from the Brazil and Iberian Margins. The data demonstrate the existence of a shallow well-ventilated northern-sourced cell overlying a poorly ventilated, predominantly southern-sourced cell at the Last Glacial Maximum. We also find that organic carbon remineralization rates in the deep Atlantic remained broadly similar to modern, but that ventilation ages in the southern-sourced overturning cell were significantly increased. Respired carbon storage in the deep Atlantic was therefore enhanced during the last glacial period, primarily due to an increase in the residence time of carbon in the deep ocean, rather than an increase in biological carbon export. The Atlantic Ocean overturning circulation and its impact on respired carbon storage during glacial periods remains a mystery. Here, the authors combine radiocarbon and stable carbon isotope data from the Brazil and Iberian Margins to investigate ocean circulation and carbon storage at the Last Glacial Maximum.