Major lithogenic contributions to the distribution and budget of iron in the North Pacific Ocean
Major lithogenic contributions to the distribution and budget of iron in the North Pacific Ocean
复制标题
成岩作用对北太平洋铁的分布和预算的主要贡献
DOI：
10.1038/s41598-019-48035-1
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发表时间：
2019
影响因子：
4.6
通讯作者：
Sohrin Yoshiki
中科院分区：
文献类型：
--
作者：
Zheng Linjie;Sohrin Yoshiki
近年来的研究表明，铁是影响海洋生态系统生产力和现代海洋中其他元素地球化学循环的重要微量元素。然而，我们对铁的地球化学的理解仍然是不完整的。在这里，我们报告的盆地尺度和全深度剖面分布的总溶解铁（tdFe），溶解铁（dFe），和不稳定的颗粒铁（lpFe = tdFe - dFe）在北太平洋，在三个巡航的GEOTRACES日本计划。我们发现lpFe占主导地位的tdFe和不稳定的颗粒铝（lpAl）显著相关：lpFe [nmol kg−1] =（0.544 ± 0.005）lpAl [nmol kg−1] + 0.11 ± 0.04，r2 = 0.968，n = 432。结果表明，一个主要的成岩贡献的颗粒铁的分布。对于dFe，独特的分布归因于地球化学循环，锰还原和成岩作用的综合影响。根据同时观测的铁，铝，锰（Mn），我们推断，边界清除区的宽度约为500公里的阿留申大陆架。我们估计北太平洋中tdFe的存量为1.1 × 10 ~（12）mol，约为dFe的4倍。我们的研究结果强调了lpFe在海洋铁循环中的潜在重要性。
Recent studies have elucidated that iron (Fe) is a critical trace metal that influences the productivity of marine ecosystems and the biogeochemical cycles of other elements in the modern ocean. However, our understanding of the biogeochemistry of Fe remains incomplete. Herein, we report basin-scale and full-depth sectional distributions of total dissolvable iron (tdFe), dissolved iron (dFe), and labile particulate iron (lpFe = tdFe – dFe) in the North Pacific Ocean, as observed during three cruises of the GEOTRACES Japan program. We found that lpFe dominates tdFe and is significantly correlated with labile particulate aluminum (lpAl): lpFe [nmol kg−1] = (0.544 ± 0.005) lpAl [nmol kg−1] + 0.11 ± 0.04,r2= 0.968,n= 432. The results indicate a major lithogenic contribution to the distribution of particulate Fe. For dFe, the unique distribution is attributed to the combined effects of biogeochemical cycling, manganese reduction, and lithogenic contribution. Based on concurrent observations of Fe, Al, and manganese (Mn), we infer that the width of the boundary scavenging zone is approximately 500 km off the Aleutian shelf. We estimate the inventory of tdFe in the North Pacific as 1.1 × 1012mol, which is approximately four times that of dFe. Our results emphasize the potential importance of lpFe in the ocean’s iron cycle.