Baroclinic seamount-trapped waves are thought to influence their surrounding ecosystem; however, trapped waves are not well-studied in near-equatorial settings, where stratification is strong and Burger numbers are large. Motivated by observations, we use daily output (2005–2009) from the global Parallel Ocean Program Model (POP) to examine topographically trapped baroclinic waves around the Seychelles Plateau () in the tropical Indian Ocean. These trapped waves are associated with velocity and temperature oscillations at periods of 15–16 days, similar to the dominant period of some equatorial Yanai waves. Energy flux maps using POP output suggest that quasi-biweekly equatorial Yanai waves excite trapped waves on the western and south-western flanks of the Seychelles Plateau, near the surface. The anticyclonic energy flux associated with the trapped wave extends vertically throughout the water column and around most of the plateau circumference, diminishing on the eastern flank of the plateau. This work highlights the role that equatorial planetary waves and trapped waves play in facilitating energy redistribution, dissipation, and mixing in the tropical ocean.

中文翻译：

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低纬度海山陷波的产生：以塞舌尔高原为例

斜压海山陷波被认为会影响其周围的生态系统；然而，在近赤道环境中，陷波没有得到很好的研究，那里的分层很强，伯格数很大。在观察的推动下，我们使用全球平行海洋计划模型 (POP) 的每日输出 (2005-2009) 来检查塞舌尔高原周围地形捕获的斜压波 () 在热带印度洋。这些被困波与 15-16 天周期的速度和温度振荡有关，类似于一些赤道柳井波的主导周期。使用 POP 输出的能量通量图表明，准双周一次的赤道柳井波激发了塞舌尔高原西侧和西南侧靠近地表的被困波。与被困波相关的反气旋能量通量垂直延伸到整个水柱和高原周边的大部分区域，在高原东侧逐渐减弱。这项工作突出了赤道行星波和困波在促进热带海洋中的能量重新分配、消散和混合方面的作用。