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Observation of internal tides and near-inertial motions in the upper 450 m layer of the northern South China Sea

机译:南海北部450 m层内潮和近惯性运动的观测

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摘要

Mooring ADCP current observations from August to November are used to study the barotropic tides, baroclinic tides and near-inertial motions in the upper 450 m layer of the northern South China Sea. The barotropic and baroclinic tides at the mooring station are all dominated by M_2, K_1, O_1, P_1, with the barotropic amplitudes being 7.8 cm·s~(-1), 7.0 cm·s~(-1), 5.4 cm·s~(-1) and 3.5 cm·s~(-1) respectively. The amplitudes of M_2, K_1, O_1, P_1 internal tides vary greatly, which are 12—15 cm·s~(-1) in the thermocline, and then decrease with increasing depth. The amplitude of the barotropic near-inertial motions is less than 1 cm·s~(-1), contributing little to the barotropic currents. However, that of the baroclinic near-inertial motions can be as large as 5 cm·s~(-1). The inclination of tidal ellipse tends to increase with increasing depth, implying upward propagation of energy, while that of the near-inertial ellipse tends to decrease with increasing depth, implying downward propagation of energy.
机译:8月至11月ADCP系泊目前的观测结果用于研究南海北部450 m层的正压潮,斜压潮和近惯性运动。系泊站的正压潮和斜压潮主要由M_2,K_1,O_1,P_1主导,其正压振幅分别为7.8 cm·s〜(-1),7.0 cm·s〜(-1),5.4 cm·s。 〜(-1)和3.5 cm·s〜(-1)。 M_2,K_1,O_1,P_1内部潮汐的幅值变化很大,在热跃层中为12-15 cm·s〜(-1),然后随着深度的增加而减小。正压近惯性运动的振幅小于1 cm·s〜(-1),对正压电流的贡献很小。但是,斜压近惯性运动的斜率可能高达5 cm·s〜(-1)。潮汐椭圆的倾角倾向于随着深度的增加而增加,这意味着能量的向上传播,而近惯性椭圆的倾角倾向于随着深度的增加而减小,这意味着能量的向下传播。

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