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首页> 外文期刊>Geophysical Research Letters >Seamounts in a restless ocean: Response of passive tracers to sub-tidal flow variability
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Seamounts in a restless ocean: Response of passive tracers to sub-tidal flow variability

机译：不安定海洋中的海山：被动示踪剂对潮汐流下变化的响应

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摘要

The action of sub-tidal oceanic flow impinging on an isolated seamount, and its consequences for biological tracer patterns, was assessed using a three-dimensional ocean circulation model. Passive tracers released above an isolated Gaussian seamount were exposed to variations of flow magnitude, frequency, direction and seamount height. The evolving patterns indicate significant qualitative differences: Steady and amplitude modulated unidirectional inflows generate advective downstream particle loss and patchiness. Non-uniform inflow reduces advective particle loss, and tracers are systematically redistributed and aggregated around the seamount summit. Tracer retention is mainly controlled by flow magnitude and summit depth. Variations of flow period were of lesser importance. Two important biological implications arise from this study: First, particle dynamics at isolated seamounts is strongly constrained by mesoscale variability of the sub-tidal far field flow. Secondly, the influence of seamounts on particle distribution is not restricted to local and small-scale phenomena, but can penetrate deep into the oceanic far field on a scale of tens to hundreds of kilometers.
机译：使用三维海洋环流模型评估了潮下海流撞击到孤立海山上的作用及其对生物示踪剂模式的影响。在孤立的高斯海山上方释放的无源示踪剂暴露于流量大小，频率，方向和海山高度的变化。演变的模式表明了明显的质量差异：平稳和振幅调制的单向流入会产生对流下游颗粒损失和斑块。非均匀的流入减少了对流颗粒的损失，示踪剂在海山顶附近被系统地重新分布和聚集。示踪剂保留主要由流量大小和山顶深度控制。流动时间的变化的重要性较小。这项研究产生了两个重要的生物学意义：首先，潮汐下远场流的中尺度变化强烈限制了孤立海山的粒子动力学。其次，海山对粒子分布的影响不仅限于局部现象和小规模现象，还可以深入数十到数百公里的海洋远场。

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