Observation of internal tides and near-inertial motions in the upper 450 m layer of the northern South China Sea
Observation of internal tides and near-inertial motions in the upper 450 m layer of the northern South China Sea
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DOI：
10.1360/982005-210
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发表时间：
2005-12
影响因子：
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通讯作者：
Xin‐Zhong Liang;Xiaoqian Zhang;Jiwei Tian
中科院分区：
文献类型：
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作者：
Xin‐Zhong Liang;Xiaoqian Zhang;Jiwei Tian
利用8 - 11月系泊ADCP海流观测资料，研究了南海北部450 m上层的正压潮、斜压潮和近惯性运动。系泊站正斜压潮汐均以M2、K1、O1、P1为主，正压幅值分别为7.8 cm·s−1、7.0 cm·s−1、5.4 cm·s−1和3.5 cm·s−1。M2、K1 O1、P1内潮的振幅变化较大，在温跃层中变化幅度为12 ~ 15 cm·s−1，然后随着深度的增加而减小。正压近惯性运动的幅值小于1 cm·s−1，对正压流的贡献不大。而斜压近惯性运动则可达5 cm·s−1。潮汐椭圆的倾角随深度增加而增加，意味着能量向上传播；近惯性椭圆的倾角随深度增加而减小，意味着能量向下传播。
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 M2, K1, O1, P1, with the barotropic amplitudes being 7.8 cms·s−1, 7.0 cm·s−1, 5.4 cm·s−1 and 3.5 cm·s−1 respectively. The amplitudes of M2, K1 O1, P1 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.