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基于自2002年3月17日至4月15日在锚定测流站平均位置(20°49′57″N,120°48′12″E)处观测海流,在吕宋海峡从卫星绝对地形导出的地转流(简称为卫星地转流)以及采用最大熵方法作谱分析,研究了吕宋海峡海流的结构和变化.在锚定测流站处亚潮流表明,当水深增大时,流速减少,流向则以反气旋方向旋转.这揭示在上层海流向南海进入,而在中层南海水向太平洋流出.在吕宋海峡海流的垂直结构充分地显示吕宋海峡的三明治结构,虽然在海底附近水层并未进行观测.谱分析结果表明存在以下显著的谱峰周期:(ⅰ)在垂向方向上潮流变化;(ⅱ)在200和500m处,对于频率f>0和f<0的两种情况,都存在周期约为4～6d,而在800m处只在f>0情况下存在上述周期;(ⅲ)在200,500和800m处,对于f>0和f<0两种情况都存在周期约为2～3d.上述结果揭示吕宋海峡海流自表层至800m整个水体都存在显著的天气尺度的变化.从观测流和水文与卫星观测都揭示在2002年春季吕宋海峡并不存在黑潮流套.
Based on the current observed at the average position of the anchored rover stations (20 ° 49’57 “N, 120 ° 48’12” E) from March 17 to April 15, 2002, from the satellite absolute terrain And the maximum entropy method is used for the spectral analysis to study the structure and variation of the current in the Luzon Strait.The sub-tidal current at the anchored anemometer station shows that when the water depth increases, The flow rate decreases and the flow rotates in the anti-cyclone direction, revealing the entry into the South China Sea in the upper ocean currents and the outflow to the Pacific Ocean in the middle South China Sea.The vertical structure of the currents in the Luzon Strait fully shows the sandwich structure of the Luzon Strait, The nearby water layer was not observed and the results of the spectral analysis showed the following significant peak periods: (i) tidal current variation in the vertical direction; (ii) at 200 and 500 m for frequencies f> 0 and f <0 In both cases, there are periods of about 4 ~ 6d, while at 800m the above period exists only for f> 0; (iii) at 200,500 and 800m for both f> 0 and f <0 The period of about 2 ~ 3d.The above results reveal that the Luzon Strait current from the surface to the entire water body 800m there is a significant weather scale Changes from the observation flow and hydrological and satellite observations have revealed that the Kuroshio current does not exist in the Luzon Strait in the spring of 2002.