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Tidally generated island wakes and surface water cooling over Izu Ridge

机译：潮汐产生的岛屿苏醒和伊豆岭上空的地表水冷却

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摘要

The Kuroshio current is well known for generating cold wakes behind islands over Izu Ridge in Northwestern Pacific. Observational data from the geostationary Himawari-8 satellite for 2015-2017 revealed the occurrence of cold waters during the period when the Kuroshio current flows away from the islands. With a focus on tidal currents, this study presents an investigation of dynamical processes responsible for the formation of areas with low sea surface temperature (SST) through the adoption of a high-resolution numerical ocean model for an event that happened in July 2017. Areas with cold water emerged only when tidal currents are included in the numerical model. The model results indicate the cold surface waters are formed in the vicinity of the islands because of upwelling and vertical mixing. Qualitative features of the cold water formation for each island are found to depend on its size, topography, and ambient currents. Near Kozu Island, the tidal excursion is large enough to cause eddy shedding. These shed eddies are stirred by tidal currents to extend the surface cooling effect to wider areas. Near Hachijo Island, a persistent wake is formed by the ambient northward current. Inclusion of tidal currents destabilizes the wake, and consequently leads to the formation of a low SST area, although no clear eddy shedding is detected. The flow patterns around the islands are classified using an additional non-dimensional parameter, defined as the ratio between tidal excursion and island diameter.
机译：黑潮洋流以在西北太平洋伊豆岭上方的岛屿后面产生冷尾流而闻名。对地静止的Himawari-8卫星2015年至2017年的观测数据显示，在黑潮流离岛的期间出现了冷水。本研究以潮汐为重点，通过对2017年7月发生的事件采用高分辨率数值海洋模型，对形成低海表温度（SST）区域的动力过程进行了研究。仅当数值模型中包括潮流时，冷水才出现。模型结果表明，由于上升流和垂直混合作用，在岛附近形成了地表冷水。发现每个岛的冷水形成的质量特征取决于其大小，地形和环境电流。在Kozu岛附近，潮汐偏移大到足以引起涡流脱落。这些脱落的涡流被潮汐流搅动，以将表面冷却作用扩展到更大的区域。在八丈岛附近，周围的北风形成持续的尾流。尽管未检测到明显的涡流脱落，但包含潮汐流会使尾流不稳定，从而导致形成低SST区域。使用附加的无量纲参数（定义为潮汐偏移与岛径之比）对岛周围的流型进行分类。

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