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首页> 外文期刊>Ocean Dynamics >Modelling tidally induced larval dispersal over Anton Dohrn Seamount
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Modelling tidally induced larval dispersal over Anton Dohrn Seamount

机译：对潮汐引起的幼虫在安东多恩海山上的扩散进行建模

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摘要

Massachusetts Institute of Technology general circulation model is used for the analysis of larval dispersal over Anton Dohrn Seamount (ADS), North Atlantic. The model output validated against the in situ data collected during the 136th cruise of the RRS James Cook' in May-June 2016 allowed reconstruction of the details of the baroclinic tidal dynamics over ADS. The obtained velocities were used as input data for a Lagrangian-type passive particle tracking model to reproduce the larval dispersal of generic deep-sea water invertebrate species. It was found that the residual tidal flow over ADS has a form of a pair of dipoles and cyclonic and anti-cyclonic eddies located at the seamount periphery. In the vertical direction, tides form upward motions above the seamount summit. These currents control local larval dispersal and their escape from ADS. The model experiment with a large number of particles (7500) evenly seeded on the ADS surface has shown that the trajectory of every individual particle is sensitive to the initial position and the tidal phase where and when it is released. The vast majority of the particles released above 1000 m depth remain seated in the same depth band where they were initially released. Only 8% of passive larvae were able to remain in suspension until competent to settle (maximise dispersal capability) and settle (make contact with the bottom) within the specified limits for this model. It was found that every tenth larval particle could leave the seamount and had a chance to be advected to any other remotely located seamount.
机译：麻省理工学院的一般环流模型用于分析北大西洋的安东·多恩·海山（ADS）上的幼虫扩散。根据在2016年5月至6月的RRS James Cook'的第136次航行中收集的现场数据验证的模型输出允许重建ADS上斜压潮汐动力学的细节。将获得的速度用作拉格朗日型被动粒子跟踪模型的输入数据，以重现一般深海无脊椎动物物种的幼虫扩散。已经发现，ADS上的剩余潮汐流具有一对偶极子以及位于海山外围的气旋和反气旋涡的形式。在垂直方向上，潮汐在海山顶上方形成向上运动。这些电流控制着幼虫的局部扩散以及它们从ADS逃逸的能力。在ADS表面均匀接种大量粒子（7500）的模型实验表明，每个单独的粒子的轨迹对释放时和释放时的初始位置和潮汐阶段均敏感。超过1000 m深度释放的绝大多数粒子仍停留在最初释放它们的相同深度带中。在此模型的指定限制内​​，只有8％的被动幼虫能够保持悬浮状态，直到能够沉降（最大分散能力）并沉降（与底部接触）为止。结果发现，每十分之一的幼虫颗粒都可能离开海山，并有机会被其他任何遥远的海山平移。

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