Observation of Internal Tides in the Qiongzhou Strait by Coastal Acoustic Tomography
Observation of Internal Tides in the Qiongzhou Strait by Coastal Acoustic Tomography
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琼州海峡内潮汐沿海声波层析观测
DOI：
10.1007/s11802-021-4590-x
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发表时间：
2021-10-01
影响因子：
1.6
通讯作者：
Kaneko, Arata
中科院分区：
文献类型：
--
作者：
Chen Minmo;Zhu Zenan;Kaneko, Arata
利用2013年开展的琼州海峡海岸声学层析成像实验的倒易声透射数据，通过功率谱密度和反演分析，获得了琼州海峡温度的频率特征和空间分布。结果表明，三种主要类型的内潮（周日，半日，和terdaily）。对沿着北部和南部传播路径的距离平均温度偏差进行谱分析表明，沿着北方路径，周日内潮的能量明显大于半日潮的能量。半日内潮，相反，更明显的沿着南部的路径。一个terdaily频谱的能量水平相当于半日内潮的北方和南部的路径是可辨别的。这三种内潮也可以从纬向平均温度偏差的时间变化中识别出来。日内潮在北方沿岸沿着增强，表明内潮向西传播，存在沿岸滞留效应。其他两种类型的内潮汐，具有较小的波长比昼夜内潮汐，在整个层析域，由于反演的分辨率不足，分辨率较低。经误差估计，数据质量令人满意。
In this study, power spectral density and inverse analyses were performed to obtain the frequency characteristics and spatial distribution of temperature in the Qiongzhou Strait using reciprocal sound transmission data obtained in a coastal acoustic tomography experiment conducted in 2013. The results reveal three dominant types of internal tides (diurnal, semidiurnal, and terdiurnal). Spectral analysis of the range-average temperature deviation along the northern and southern transmission paths shows that along the northern path, the energy of the diurnal internal tides was significantly larger than that of the semidiurnal tides. The semidiurnal internal tides, in contrast, were more pronounced along the southern path. A terdiurnal spectrum with an energy level equivalent to that of the semidiurnal internal tide was discernable for both the northern and southern paths. These three types of internal tides can also be recognized in the time variation of the zonal-average temperature deviation. The diurnal internal tides were strengthened along the northern coast, implying their westward propagation and the existence of coastally trapped effects. The other two types of internal tides, which have smaller wavelengths than the diurnal internal tides, were less resolved over the entire tomographic domain due to the insufficient resolution of the inversion. The data quality was verified to be satisfactory by error estimation.