Large-Scale, Persistent Nutrient Fronts of the World Ocean: Impacts on Biogeochemistry

Large-Scale, Persistent Nutrient Fronts of the World Ocean: Impacts on Biogeochemistry
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世界海洋大规模、持久的营养锋:对生物地球化学的影响

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发表时间:
2013
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影响因子:
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通讯作者:
N. Gruber
N. Gruber
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作者:
J. Palter;I. Marinov;J. Sarmiento;N. Gruber

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本章确定并描述了跨越流域宽度的大规模营养锋,并探讨了维持这些锋的过程和对它们起作用的过程。特别是,我们调查的营养锋环的副热带环流,并提出,交换这些方面代表了一个重要的途径,营养物质进入环流。然而,这些非地球化学前沿往往与动力学前沿或喷流相一致,这通常被认为是交换的障碍。因此,我们将海洋前沿视为养分通道的观点必须与它们作为交换障碍的倾向相协调。Ekman运输是一种机制,允许营养输送的表面的锋,并被证明是一个领先的长期在亚热带营养收支。环的形成和喷流核心下的混合是其他机制,可以调解跨锋面交换,并有有趣的营养收支及其变化的影响。
This chapter identifies and describes the large-scale nutrient fronts that span the width of basins and explores the processes that maintain these fronts and those that act against them. In particular, we investigate the nutrient fronts that ring the subtropical gyres and propose that exchange across these fronts represents a critical pathway for nutrients to enter the gyres. However, these biogeochemical fronts most often coincide with dynamical fronts or jets, which are often considered barriers to exchange. Therefore, our view of ocean fronts as nutrient gateways must be reconciled with their tendency to act as barriers to exchange. Ekman transport is one mechanism that allows for nutrient transport across the surface of the fronts and is shown to be a leading term in the subtropical nutrient budgets. Ring formation and mixing beneath the core of jets are other mechanisms that can mediate cross-frontal exchange and have intriguing implications for nutrient budgets and their variability.
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