2008年8月份在吕宋海峡西侧大约4000m深的海域首次布放了两套深水潜标，对上层海洋进行了为期一个月的高频率ADCP海流采样。对数据进行了多重处理，分解得到平均流和逐层潮流，并分析了具有斜压性海流的频率分布。调和分析结果表明，该海域以不规则日周期潮流为主，潮流椭圆随深度旋转。海流的功率谱分析表明，内潮能量在温跃层附近最大，并随深度减小，同时海流有明显的近惯性振荡信号。该观测为了解吕宋海峡深层海洋的潮流、近惯性运动以及海峡水交换提供了第一手的资料。

An ADCP mooring system was placed at a depth of 4000m southwest of the Luzon Strait in August 2008. Upper-ocean currents at high frequency were measured for about one month. Using different data processing methods, the authors analyze the current records to obtain the vertically averaged currents, tidal currents at each depth, and frequency distributions of the baroclinic currents. The main tidal components in this area are irregular diurnal tidal currents, and their ellipses are spiraling with depth. The power spectrum indicates that the tidal energy reaches the maximum near the thermocline and then decreases with depth. The analysis of the current frequency also shows that the currents have significant near-inertial oscillations. These observations provide first-hand data for studying tidal currents, near-inertial oscillations and water exchange between the South China Sea and the Pacific nearby the Luzon Strait.