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应用2008年4月25日至9月26日的声学多普勒流速剖面仪(ADCP)的锚定测流资料,研究分析吕宋海峡上层海洋的内潮特征.谱分析和能量计算均显示在观测海区全日潮和半日潮为主要的能量频带,深度积分的全日潮频带总能量为31 kJ.m,在半日潮频带和高频带深度积分的总能量分别为6.9和3.4 kJ.m.谱分析结果显示:近惯性频率峰值仅出现在斜压分量.在66 m以浅深度,显著分潮(O1,K1,M2,MK3,M4)和近惯性频率分量都基本符合线性内波理论关系式E+(ω)/E-(ω)=(ω-f)2/(ω+f)2;然而,在其他观测深度,并非所有的主要分潮均满足上述线性内波能量一致性关系式.分析潮流的垂直结构和时间变化,结果表明:正压潮和内潮均为混合潮,潮日不等现象明显,显示了约14天的大潮/小潮周期变化.平行与垂直于陆架方向的K1和O1分潮的分量几乎相等,而M2和S2分潮则主要以波束形式向南海北部陆架传播.内潮幅度和相位均随时间变化,M2和S2垂向结构主要表现为第1模态,而K1和O1则接近于第2模态结构;在主温跃层附近,它们的短轴与长轴之比与f/ω的比值接近.
The internal wave characteristics of the upper Luzon Strait ocean were analyzed using the anchored meteorological data of Acoustic Doppler Velocity Profiler (ADCP) from April 25 to September 26, 2008. Both spectral analysis and energy calculation Total tidal and semi-diurnal tidal waves in the sea area are the main energy bands. The total energy of the full-day tidal band for the depth integral is 31 kJ · m, and the total energy of the integral for the half-day tidal and high-frequency bands is 6.9 and 3.4 kJ · m, respectively The results show that the peak value of near-inertial frequency only appears in the baroclinic component.With the shallow depth of 66 m, the significant tidal components (O1, K1, M2, MK3, M4) (ω) / E (ω) = (ω-f) 2 / (ω + f) 2; however, not all of the main tidal wave at other observed depths satisfy the above linear internal wave energy consistency relationship. The results show that both the positive and negative tide are mixed tide and the tide-day variation is obvious, which shows the tidal / small tidal cycle change of about 14 days.The K1 and K1 values of the parallel and perpendicular to the shelf direction The components of O1 moisture are almost equal, while the M2 and S2 moisture mainly propagate to the northern shelf of the South China Sea in beam form. The phase changes with time, the vertical structure of M2 and S2 is mainly the first mode, while K1 and O1 are close to the second mode structure; in the vicinity of the main thermocline, their ratio of the short axis to the long axis The ratio of f / ω is close.