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The effect of advection on the nutrient reservoir in the North Atlantic subtropical gyre

机译:对流对北大西洋亚热带回旋区养分储层的影响

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Though critically important in sustaining the ocean's biological pump, the cycling of nutrients in the subtropical gyres is poorly understood. The supply of nutrients to the sunlit surface layer of the ocean has traditionally been attributed solely to vertical processes. However, horizontal advection may also be important in establishing the availability of nutrients. Here we show that the production and advection of North Atlantic Subtropical Mode Water introduces spatial and temporal variability in the subsurface nutrient reservoir beneath the North Atlantic subtropical gyre. As the mode water is formed, its nutrients are depleted by biological utilization. When the depleted water mass is exported to the gyre, it injects a wedge of low-nutrient water into the upper layers of the ocean. Contrary to intuition, cold winters that promote deep convective mixing and vigorous mode water formation may diminish downstream primary productivity by altering the subsurface delivery of nutrients.
机译:尽管在维持海洋生物泵方面至关重要,但对亚热带回旋中养分循环的了解却很少。传统上,向海洋阳光照射的表层供应养分的原因完全是垂直过程。但是,水平对流对确定养分的利用率也可能很重要。在这里,我们表明,北大西洋亚热带模式水的生产和平流在北大西洋亚热带回旋下的地下营养储集层中引入了时空变化。随着模式水的形成,其营养物质被生物利用所消耗。当枯竭的水团出口到回旋管时,它将低营养水楔入海洋的上层。与直觉相反,促进深度对流混合和剧烈模式水形成的寒冷冬季可能会通过改变营养物质的地下输送来降低下游的初级生产力。

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