The underappreciated role of anthropogenic sources in atmospheric soluble iron flux to the Southern Ocean
The underappreciated role of anthropogenic sources in atmospheric soluble iron flux to the Southern Ocean
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DOI：
10.1038/s41612-022-00250-w
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发表时间：
2022-04
影响因子：
9
通讯作者：
Mingxu Liu;H. Matsui;D. Hamilton;K. Lamb;S. Rathod;J. Schwarz;N. Mahowald
中科院分区：
文献类型：
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作者：
Mingxu Liu;H. Matsui;D. Hamilton;K. Lamb;S. Rathod;J. Schwarz;N. Mahowald
可溶性（生物可利用）铁的大气沉积增强海洋初级生产力和随后的大气CO2封存在铁有限的海洋盆地，特别是南大洋。虽然最近有人提出，在北方的一些海洋中，人为来源很重要，但在南大洋中的作用仍然不明确。通过比较多个模型模拟与新的飞机观测人为铁，我们表明，人为可溶性铁沉积通量南大洋可能被低估了10倍以上，在以前的建模估计。我们改进的估计人为铁预算提高其对可溶性铁沉积在南大洋的贡献从约10%到60%，这意味着人为来源的主导作用。我们预测到2100年，南大洋的人为可溶性铁沉积将大幅减少（30 ~ 90%），并在南大洋大气可溶性铁输入的未来演变中发挥重要作用。
The atmospheric deposition of soluble (bioaccessible) iron enhances ocean primary productivity and subsequent atmospheric CO2sequestration in iron-limited ocean basins, especially the Southern Ocean. While anthropogenic sources have been recently suggested to be important in some northern hemisphere oceans, the role in the Southern Ocean remains ambiguous. By comparing multiple model simulations with the new aircraft observations for anthropogenic iron, we show that anthropogenic soluble iron deposition flux to the Southern Ocean could be underestimated by more than a factor of ten in previous modeling estimates. Our improved estimate for the anthropogenic iron budget enhances its contribution on the soluble iron deposition in the Southern Ocean from about 10% to 60%, implying a dominant role of anthropogenic sources. We predict that anthropogenic soluble iron deposition in the Southern Ocean is reduced substantially (30‒90%) by the year 2100, and plays a major role in the future evolution of atmospheric soluble iron inputs to the Southern Ocean.