Abstract Deep-ocean islands have long been associated with the generation of oceanic eddies in their wakes. However, their interaction with incoming eddies has seldom been considered. This study focuses on the characterization of background and locally generated mesoscale eddies in the Cabo Verde archipelago between 2003 and 2014. Special attention is given to the interaction of incoming eddies with the bathymetry of the islands, along with their impacts on the local generation of eddies. Island-induced wind-shear effects are also considered. In addition, some examples of the biological response to background and locally generated eddies are discussed. This is achieved by combining remote-sensing satellite observations for wind, sea surface height, and chlorophyll-a (Chla) surface concentrations. The results show that the interaction between incoming background eddies and the archipelago is a recurrent phenomenon, which results in eddy deflection, splitting, merging, intensification, and termination (sorted by highest to lowest number of occurrences). Local island-induced disturbances are also significant, mainly due to atmospheric effects. Such processes result in the generation of island-induced eddies and in wind-mediated eddy intensification and confinement, more often observed in the leeward group. Nonetheless, it is strongly suggested that many of the locally generated eddies are a direct product or by-product of the interaction of background eddies with the islands. With respect to the biological realm, a locally generated cyclonic eddy is observed to originate a pronounced phytoplankton bloom in the vicinity of the tallest island. Nonetheless, background eddies generated off the African coast are often associated with enhanced Chla concentrations when they intersect the archipelago. Such observations challenge the idea that local biological productivity in deep oceanic islands is exclusively driven by island-induced mechanisms.

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岛屿作为涡流转换和生成热点：佛得角案例研究

摘要 深海岛屿长期以来一直与尾流产生的大洋涡旋有关。然而，很少考虑它们与传入涡流的相互作用。这项研究的重点是 2003 年至 2014 年佛得角群岛背景和局部产生的中尺度涡旋的特征。特别关注传入涡旋与岛屿水深测量的相互作用，以及它们对局部涡旋产生的影响. 还考虑了岛屿引起的风切变效应。此外，还讨论了对背景和局部产生的涡流的生物响应的一些例子。这是通过结合对风、海面高度和叶绿素-a (Chla) 表面浓度的遥感卫星观测来实现的。结果表明，传入的背景涡流与群岛之间的相互作用是一种反复出现的现象，导致涡流偏转、分裂、合并、增强和终止（按出现次数从高到低排序）。局部岛屿引起的扰动也很显着，主要是由于大气影响。这些过程导致岛屿引起的涡流和风介导的涡流增强和限制的产生，在背风组中更常见。尽管如此，强烈建议许多本地产生的涡流是背景涡流与岛屿相互作用的直接产物或副产物。在生物领域，观察到局部产生的气旋涡流在最高岛屿附近引发了明显的浮游植物大量繁殖。尽管如此，当它们与群岛相交时，在非洲海岸附近产生的背景涡流通常与增强的 Chla 浓度有关。这样的观察挑战了深海岛屿当地生物生产力完全由岛屿诱导机制驱动的观点。