Humic substances may control dissolved iron distributions in the global ocean: Implications from numerical simulations
Humic substances may control dissolved iron distributions in the global ocean: Implications from numerical simulations
复制标题
腐殖质可以控制全球海洋中溶解铁的分布：数值模拟的意义
DOI：
10.1002/gbc.20039
复制
发表时间：
2013
影响因子：
5.2
通讯作者：
Y. Yoshida
中科院分区：
文献类型：
--
作者：
K. Misumi;K. Lindsay;J. K. Moore;S. Doney;D. Tsumune;Y. Yoshida
这项研究使用海洋环流模型来模拟海洋铁循环，以研究弱铁结合配体的模拟分布如何控制海洋中的溶解铁浓度，特别关注深海沃茨。表观氧利用率的分布被用作腐殖物质的代表，最近假设腐殖物质是海水中大量弱铁结合配体的原因。与均匀配体分布的传统方法相比，采用空间可变配体浓度的模拟在全球溶解铁分布的模拟中表现出了实质性的改善，与现有的现场数据进行比较。模拟技能的提高主要是因为空间可变的配体分布导致铁在高浓度下存在时的停留时间的更合理的流域尺度变化。模型结果，结合最近的实地研究的证据，表明腐殖物质在海洋中的铁循环中发挥着重要作用。
This study used an ocean general circulation model to simulate the marine iron cycle in an investigation of how simulated distributions of weak iron‐binding ligands would be expected to control dissolved iron concentrations in the ocean, with a particular focus on deep ocean waters. The distribution of apparent oxygen utilization was used as a proxy for humic substances that have recently been hypothesized to account for the bulk of weak iron‐binding ligands in seawater. Compared to simulations using a conventional approach with homogeneous ligand distributions, the simulations that incorporated spatially variable ligand concentrations exhibited substantial improvement in the simulation of global dissolved iron distributions as revealed by comparisons with available field data. The improved skill of the simulations resulted largely because the spatially variable ligand distributions led to a more reasonable basin‐scale variation of the residence time of iron when present at high concentrations. The model results, in conjunction with evidence from recent field studies, suggest that humic substances play an important role in the iron cycle in the ocean.