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An extreme internal solitary wave event observed in the northern South China Sea

机译:南海北部观测到的极端内部孤立波事件

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摘要

With characteristics of large amplitude and strong current, internal solitary wave (ISW) is a major hazard to marine engineering and submarine navigation; it also has significant impacts on marine ecosystems and fishery activity. Among the world oceans, ISWs are particular active in the northern South China Sea (SCS). In this spirit, the SCS Internal Wave Experiment has been conducted since March 2010 using subsurface mooring array. Here, we report an extreme ISW captured on 4 December 2013 with a maximum amplitude of 240 m and a peak westward current velocity of 2.55 m/s. To the authors’ best knowledge, this is the strongest ISW of the world oceans on record. Full-depth measurements also revealed notable impacts of the extreme ISW on deep-ocean currents and thermal structures. Concurrent mooring measurements near Batan Island showed that the powerful semidiurnal internal tide generation in the Luzon Strait was likely responsible for the occurrence of the extreme ISW event. Based on the HYCOM data-assimilation product, we speculate that the strong stratification around Batan Island related to the strengthening Kuroshio may have contributed to the formation of the extreme ISW.
机译:内部孤波(ISW)具有振幅大,电流大的特点,是对海洋工程和潜艇航行的主要危害。它也对海洋生态系统和渔业活动产生重大影响。在世界海洋中,ISW在南中国海北部特别活跃。本着这种精神,自2010年3月起使用地下系泊装置进行了SCS内部波浪实验。在这里,我们报告了2013年12月4日捕获的极端ISW,其最大振幅为240 m,西向峰值流速为2.55 m / s。据作者所知,这是有记录以来世界上最强的ISW。全深度测量还揭示了极端ISW对深海电流和热结构的显着影响。巴坦岛附近的并发系泊测量表明,吕宋海峡内强大的半日内潮汐产生可能是造成极端ISW事件的原因。基于HYCOM数据同化产品,我们推测与黑潮的加强有关的巴丹岛附近的强烈分层可能是导致极端ISW形成的原因。

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