The hadal zone is an important and heterogeneous sink of black carbon in the ocean
The hadal zone is an important and heterogeneous sink of black carbon in the ocean
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DOI：
10.1038/s43247-022-00351-7
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发表时间：
2022-02
影响因子：
7.9
通讯作者：
Xi Zhang;Yunping Xu;Wenjie Xiao;Meixun Zhao;Zicheng Wang;Xuchen Wang;Liping Xu;M. Luo;Xinxin Li;Jiasong Fang;Yin Fang;Yasong Wang;K. Oguri;F. Wenzhöfer;A. Rowden;S. Mitra;R. Glud
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文献类型：
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作者：
Xi Zhang;Yunping Xu;Wenjie Xiao;Meixun Zhao;Zicheng Wang;Xuchen Wang;Liping Xu;M. Luo;Xinxin Li;Jiasong Fang;Yin Fang;Yasong Wang;K. Oguri;F. Wenzhöfer;A. Rowden;S. Mitra;R. Glud
黑碳在海洋环境中无处不在。然而，它是否聚集在最深的海洋区域——超深渊带，尚不得而知。在这里，我们测量了六个超深渊海沟沉积物中黑碳和总有机碳的浓度和碳同位素（δ13C 和 Δ14C）。黑碳占海沟总有机碳的10%，其δ13C和Δ14C比总有机碳更负，表明黑碳主要来源于陆地C3植物和化石燃料。化石碳对黑碳库的贡献具有空间异质性，这可能与距陆地的距离、土地覆盖和社会经济发展的差异有关。在全球范围内，我们估计超深渊带的黑碳埋藏率为1.0 ± 0.5 Tg yr−1，比全球海洋单位面积平均埋藏率高出七倍。我们认为，深渊带是海洋中一个重要但被忽视的黑碳汇。
Black carbon is ubiquitous in the marine environment. However, whether it accumulates in the deepest ocean region, the hadal zone, is unknown. Here we measure the concentration and carbon isotopes (δ13C and Δ14C) of black carbon and total organic carbon in sediments from six hadal trenches. Black carbon constituted 10% of trench total organic carbon, and its δ13C and Δ14C were more negative than those of total organic carbon, suggesting that the black carbon was predominantly derived from terrestrial C3 plants and fossil fuels. The contribution of fossil carbon to the black carbon pool was spatially heterogeneous, which could be related to differences in the distance to landmass, land cover and socioeconomic development. Globally, we estimate a black carbon burial rate of 1.0 ± 0.5 Tg yr−1in the hadal zone, which is seven-fold higher than the global ocean average per unit area. We propose that the hadal zone is an important, but overlooked, sink of black carbon in the ocean.