靠近海岸涌升流的岛屿后的生物活动
Biological activity in the wake of an island close to a coastal upwelling
摘要：
水动力强迫在形成海洋生物，特别是浮游生物的动态方面发挥着重要作用。在这项工作中，我们研究了一个岛屿，这是接近上升流区的尾流的浮游生物活动。我们的研究是基于数值分析的运动流模仿的水动力学在唤醒，耦合到一个三分量的浮游生物模型。根据模型参数不同的现象进行了描述：a）缺乏运输的营养物质和浮游生物的整个唤醒，使上升流的影响，初级生产的另一侧的唤醒被阻止。b）对于足够高的涡度，尾流在促进这种输送和导致初级生产力增强方面的作用。最后c）我们表明，在一定条件下，尾流结构和生物生长之间的相互作用导致浮游生物水华内的中尺度流体动力学漩涡，作为孵化器的初级生产。
英文摘要：
Hydrodynamic forcing plays an important role in shaping the dynamics of marine organisms, in particular of plankton. In this work we study the planktonic biological activity in the wake of an island which is close to an upwelling region. Our research is based on numerical analysis of a kinematic flow mimicking the hydrodynamics in the wake, coupled to a three-component plankton model. Depending on model parameters different phenomena are described: a) The lack of transport of nutrients and plankton across the wake, so that the influence of upwelling on primary production on the other side of the wake is blocked. b) For sufficiently high vorticity, the role of the wake in facilitating this transport and leading to an enhancement of primary production. Finally c) we show that under certain conditions the interplay between wake structures and biological growth leads to plankton blooms inside mesoscale hydrodynamic vortices that act as incubators of primary production.
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