Subarctic pacific intermediate water: an oceanic highway for the transport of trace metals in the North Pacific
Subarctic pacific intermediate water: an oceanic highway for the transport of trace metals in the North Pacific
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亚北极太平洋中间水：北太平洋微量金属运输的海洋高速公路
DOI：
10.1002/lob.10490
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发表时间：
2022
影响因子：
--
通讯作者：
H. Hasegawa
中科院分区：
文献类型：
--
作者：
K.H. Wong;H. Obata;J. Nishioka;Y. Yamashita;Y. Kondo;T. Kim;A.S. Mashio;H. Hasegawa
GEOTRACES是一个国际合作项目，旨在揭示微量元素及其同位素在全球海洋中的分布。作为GEOTRACES-Japan项目的一部分，我们于2012年和2017年在亚北极太平洋进行了两次调查。在这里，我们综合了迄今为止与这些调查相关的研究成果。我们的研究结果表明，亚北极太平洋中层水是一个有效的载体的微量金属。由于有利条件的组合，源自沿海地区的铁和锰等微量金属被输送到远海。首先，年轻的上亚北极太平洋中层水接收来自陆地来源的微量金属的新鲜输入，这些金属由有机配体稳定。同时，较低的亚北极太平洋中层水具有相对较低的溶解氧浓度，这减缓了清除过程，并允许微量金属在海水中持续存在。腐烂的下沉有机物也会向中层水中释放额外的微量金属。尽管锌和硅酸盐在全球海洋中通常具有强烈的耦合分布模式，但亚北极太平洋中层水的溶解锌相对于硅酸盐具有异常高的浓度。我们希望我们的调查和相关研究产生的数据集和见解可以有助于更好地了解亚北极太平洋，并为未来的研究提供有用的信息。
GEOTRACES is an international collaboration project aiming to unravel the distributions of trace elements and their isotopes in the global ocean. As part of the GEOTRACES‐Japan project, we carried out two surveys in the subarctic Pacific in 2012 and 2017. Here, we synthesize the outcomes of research completed so far associated with these surveys. Together our findings revealed that the Subarctic Pacific Intermediate Water is an efficient carrier of trace metals. Trace metals such as iron and manganese originating in coastal regions are transported far into the open ocean due to combinations of favorable conditions. First, the young upper Subarctic Pacific Intermediate Water receives fresh inputs of trace metals, which are stabilized by organic ligands, from terrestrial sources. Meanwhile, the lower Subarctic Pacific Intermediate Water has a relatively low dissolved oxygen concentration, which slows down scavenging processes and allows trace metals to persist in seawater. Decaying sinking organic matter also releases additional trace metals into the intermediate water. The Subarctic Pacific Intermediate Water has unusually high concentrations of dissolved zinc relative to silicate, even though zinc and silicate generally have strongly coupled distribution patterns in the global ocean. We hope that the datasets and insights generated by our surveys and associated studies can contribute to greater understanding of the subarctic Pacific and provide useful information for future studies.