Air-sea disequilibrium enhances ocean carbon storage during glacial periods
Air-sea disequilibrium enhances ocean carbon storage during glacial periods
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DOI：
10.1126/sciadv.aaw4981
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发表时间：
2019-06-01
期刊：
影响因子：
13.6
通讯作者：
Muglia, J.
中科院分区：
文献类型：
--
作者：
Khatiwala, S.;Schmittner, A.;Muglia, J.
关于冰河时期大气二氧化碳（CO2）浓度降低的普遍假设是海洋生物泵的效率提高。然而，由于难以准确量化海洋碳成分，这一假设和其他假设的测试受到了阻碍。在这里，我们使用观测受限的地球系统模型来精确量化这些成分以及不同过程在模拟冰期-间冰期二氧化碳变化中所发挥的作用。我们发现，即使软组织生物泵的效率降低，海气不平衡也会极大地放大较低温度和铁肥对冰川海洋碳储存的影响。这两个过程以前被认为是次要的，解释了我们模拟的冰川二氧化碳减少的大部分原因，而迄今为止被认为占主导地位的海洋环流和海冰范围的贡献相对较小。
The prevailing hypothesis for lower atmospheric carbon dioxide (CO2) concentrations during glacial periods is an increased efficiency of the ocean's biological pump. However, tests of this and other hypotheses have been hampered by the difficulty to accurately quantify ocean carbon components. Here, we use an observationally constrained earth system model to precisely quantify these components and the role that different processes play in simulated glacial-interglacial CO2 variations. We find that air-sea disequilibrium greatly amplifies the effects of cooler temperatures and iron fertilization on glacial ocean carbon storage even as the efficiency of the soft-tissue biological pump decreases. These two processes, which have previously been regarded as minor, explain most of our simulated glacial CO2 drawdown, while ocean circulation and sea ice extent, hitherto considered dominant, emerge as relatively small contributors.