Coupling of oceanic carbon and nitrogen facilitates spatially resolved quantitative reconstruction of nitrate inventories.
Coupling of oceanic carbon and nitrogen facilitates spatially resolved quantitative reconstruction of nitrate inventories.
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DOI：
10.1038/s41467-018-03647-5
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发表时间：
2018-03-23
影响因子：
16.6
通讯作者：
Eisenhauer A
中科院分区：
文献类型：
--
作者：
Glock N;Erdem Z;Wallmann K;Somes CJ;Liebetrau V;Schönfeld J;Gorb S;Eisenhauer A
人为影响正在通过变暖效应和污染源（如化肥和化石燃料的燃烧）扰乱全球氮循环。了解对过去氮库存的控制可能会改善对未来全球生物地球化学循环的预测。在这里，我们展示了秘鲁上升流区中深度的去冰底水硝酸盐浓度的定量重建，使用有孔虫孔隙密度。脱冰硝态氮浓度与下核δ13C密切相关，与中太平洋现代水柱观测结果一致，有利于将δ13C记录用作中深度古硝酸盐的代用物，表明在秘鲁上升流区，碳和氮循环在末次脱冰期间紧密耦合。孔隙密度与中太平洋δ13C记录相结合表明，末次盛冰期硝酸盐库存比全新世增加了10 ~ 10%，与基于δ13C和δ 15n的三维海洋生物地球化学模型和前人的箱型模拟研究结果一致。了解对过去氮收支的控制可以改善对未来全球生物地球化学循环的预测。本文利用有孔虫的孔隙密度和δ13C，对中太平洋的脱冰硝酸盐进行了定量记录，并推测了碳和氮循环之间的密切耦合。
Anthropogenic impacts are perturbing the global nitrogen cycle via warming effects and pollutant sources such as chemical fertilizers and burning of fossil fuels. Understanding controls on past nitrogen inventories might improve predictions for future global biogeochemical cycling. Here we show the quantitative reconstruction of deglacial bottom water nitrate concentrations from intermediate depths of the Peruvian upwelling region, using foraminiferal pore density. Deglacial nitrate concentrations correlate strongly with downcore δ13C, consistent with modern water column observations in the intermediate Pacific, facilitating the use of δ13C records as a paleo-nitrate-proxy at intermediate depths and suggesting that the carbon and nitrogen cycles were closely coupled throughout the last deglaciation in the Peruvian upwelling region. Combining the pore density and intermediate Pacific δ13C records shows an elevated nitrate inventory of >10% during the Last Glacial Maximum relative to the Holocene, consistent with a δ13C-based and δ15N-based 3D ocean biogeochemical model and previous box modeling studies. Understanding controls on past nitrogen budgets can improve predictions for future global biogeochemical cycling. Here, using foraminiferal pore density and δ13C, the authors present a quantitative record of deglacial nitrate from the intermediate Pacific and infer close coupling between carbon and nitrogen cycles.
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