Abstract Internal solitary waves (ISWs) were observed by mooring data in the South China Sea in August and September 2014. Normally the arrival pattern of ISWs is relatively regular and the ISW amplitudes have a positive correlation with the magnitude of semidiurnal tidal currents near the Luzon Strait. However, the ISW amplitudes observed in the second spring tide of September are significantly large when an anti-cyclonic eddy is passing the mooring. When an ISW passes the eddy center, its amplitude reduces to nearly zero, but when an ISW passes the eddy edge, its amplitude increases by 50%. A deepened thermocline always damps the ISW amplitudes, whilst the eddy-induced background currents at different locations may have varied effects on the ISW amplitudes, e.g., the background current at the eddy center tends to damp the ISW amplitude but that at the eddy edge amplifies the ISW amplitude. The different effects of a deepened thermocline and eddy-induced background currents near the eddy edge may damp or amplify the ISW amplitude.

中文翻译：

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反气旋涡旋对南海内部孤立波不同影响的观测

摘要 2014年8月和2014年9月在南海通过系泊资料观测到内部孤立波（ISWs）。海峡。然而，当反气旋涡流经过系泊处时，在 9 月第二次大潮中观察到的 ISW 振幅显着大。当 ISW 通过涡流中心时，其幅度减小到几乎为零，但当 ISW 通过涡流边缘时，其幅度增加 50%。加深的温跃层总是会抑制 ISW 振幅，而不同位置的涡感背景电流可能对 ISW 振幅产生不同的影响，例如，涡中心的背景电流倾向于抑制 ISW 幅度，但涡边缘的背景电流会放大 ISW 幅度。加深的温跃层和涡流边缘附近的涡激背景电流的不同影响可能会抑制或放大 ISW 幅度。