Intense submesoscale upwelling in anticyclonic eddies
Intense submesoscale upwelling in anticyclonic eddies
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DOI：
10.1002/2016gl067926
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发表时间：
2016-04-16
影响因子：
5.2
通讯作者：
Brannigan, L.
中科院分区：
文献类型：
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作者：
Brannigan, L.
对全球海洋的观测表明，反气旋涡旋中可以发现生物活动的增强。这可能意味着富含营养的水的上涌发生在涡流内，但这种上涌并没有被解决中尺度过程的模型所捕获。高分辨率模拟显示，强烈的次中尺度上涌从温跃层的混合层中的反气旋涡旋。上升流的性质与一种称为对称不稳定性的过程相一致。一个简单的限制营养盐实验表明，当温跃层中有高营养盐浓度时，这种上升流可以驱动反气旋涡旋中更高的生物活性。在马尾藻海的反气旋涡旋的对称不稳定性相关的上升流的幅度估计表明，它可能是其他过程的规模相当，但需要进一步的工作，以了解流域规模的营养预算的全部影响。
Observations from around the global ocean show that enhanced biological activity can be found in anticyclonic eddies. This may mean that upwelling of nutrient-rich water occurs within the eddy, but such upwelling is not captured by models that resolve mesoscale processes. High-resolution simulations presented here show intense submesoscale upwelling from the thermocline to the mixed layer in anticyclonic eddies. The properties of the upwelling are consistent with a process known as symmetric instability. A simple limiting nutrient experiment shows that this upwelling can drive much higher biological activity in anticyclonic eddies when there is a high nutrient concentration in the thermocline. An estimate for the magnitude of upwelling associated with symmetric instability in anticyclonic eddies in the Sargasso Sea shows that it may be of comparable magnitude to other processes, though further work is required to understand the full implications for basin-scale nutrient budgets.