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首页> 外文期刊>Earth and Planetary Science Letters: A Letter Journal Devoted to the Development in Time of the Earth and Planetary System >On the origin of the marine zinc-silicon correlation
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On the origin of the marine zinc-silicon correlation

机译：论海洋锌 - 硅相关的起源

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摘要

The close linear correlation between the distributions of dissolved zinc (Zn) and silicon (Si) in seawater has puzzled chemical oceanographers since its discovery almost forty years ago, due to the apparent lack of a mechanism for coupling these two nutrient elements. Recent research has shown that such a correlation can be produced in an ocean model without any explicit coupling between Zn and Si, via the export of Zn-rich biogenic particles in the Southern Ocean, consistent with the observation of elevated Zn quotas in Southern Ocean diatoms. Here, we investigate the physical and biological mechanisms by which Southern Ocean uptake and export control the large-scale marine Zn distribution, using suites of sensitivity simulations in an ocean general circulation model (OGCM) and a box-model ensemble. These simulations focus on the sensitivity of the Zn distribution to the stoichiometry of Zn uptake relative to phosphate (PO4), drawing directly on observations in culture. Our analysis reveals that OGCM model variants that produce a well-defined step between relatively constant, high Zn:PO4 uptake ratios in the Southern Ocean and low Zn:PO4 ratios at lower latitudes fare best in reproducing the marine Zn-Si correlation at both the global and the regional Southern Ocean scale, suggesting the presence of distinct Zn-biogeochemical regimes in the high- and low-latitude oceans that may relate to differences in physiology, ecology or (micro-)nutrient status. Furthermore, a study of the systematics of both the box model and the OGCM reveals that regional Southern Ocean Zn uptake exerts control over the global Zn distribution via its modulation of the biogeochemical characteristics of the surface Southern Ocean. Specifically, model variants with elevated Southern Ocean Zn:PO4 uptake ratios produce near-complete Zn depletion in the Si-poor surface Subantarctic Zone, where upper-ocean water masses with key roles in the global oceanic circulation are formed. By setting the main
机译：由于偶然偶然偶联了这两个营养素的机制明显缺乏机制，海水中溶解锌（Zn）和硅（Si）的分布在海水中的溶解锌（Si）和硅（Si）之间的紧密相关性具有困惑的化学洋洋学表记录。最近的研究表明，这种相关性可以在海洋模型中产生，而没有Zn和Si之间的任何明确偶联，通过南海的富含Zn的生物颗粒的出口，与南洋硅藻的升高的Zn配额的观察一致。在这里，我们研究了南海越南海洋摄取和出口控制大型海洋ZN分布的物理和生物机制，在海洋一般循环模型（OGCM）和箱式集合中使用敏感性模拟套件。这些模拟专注于Zn分布对Zn摄取相对于磷酸盐（PO4）的化学计量的敏感性，直接绘制培养物的观察。我们的分析揭示了在南海和低Zn中相对恒定，高Zn：Po4摄取比之间产生明确定义的步骤的OGCM模型变体：PO4比率在较低的纬度下，在较低的纬度票价中再现在两者的海洋Zn-Si相关性全球和地区南海级，建议在高纬度海洋中存在明显的Zn-生物地球化学制度，其可能与生理学，生态学或（微量）营养状况的差异有关。此外，对箱体模型和OGCM的系统学的研究表明，区域南洋Zn摄取通过其调制表面南海海洋的生物地质化学特征来施加对全球Zn分布的控制。具体而言，具有升高的南海Zn：Po4摄取比的模型变体在Si差的表面小区内产生近乎完全的Zn消耗，其中形成了全球海洋循环中具有关键作用的高海水群。通过设置主要

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