Latitudinal Structure of Solitons in the South China Sea
Latitudinal Structure of Solitons in the South China Sea
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DOI：
10.1175/jpo-d-18-0071.1
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发表时间：
2019-06
影响因子：
3.5
通讯作者：
S. Ramp;Jaehun Park;Y. Yang;F. Bahr;C. Jeon
中科院分区：
文献类型：
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作者：
S. Ramp;Jaehun Park;Y. Yang;F. Bahr;C. Jeon
2011年夏季，在南中国海部署了4个海流计系泊系统和12个配备压力传感器的反向回声测深仪（PIES）。实验的目的是获得从近场到远场的大振幅非线性内波的天气观测，因为他们传播的西北偏西的海上。该计划是独一无二的，因为它是第一个观察到纬度变化的波峰除了沿沿着一个单一的东西样带。波在PIES阵列中心沿沿着约20°45′N方向最强，在两个方向上离轴较弱。a波和b波到达南方的时间都比到达北方的时间早，但不同的滞后时间表明不同的传播方向，因此也就有了不同的来源。这些波是根据它们的到达模式和源位置而不是根据它们的振幅或包结构来分类的。斯坦福大学的非结构非静力地形跟踪自适应纳维尔-斯托克斯模拟器（SUNTANS）模型，对阵列校准，显示出a波的内潮产生的吕宋海峡南部和b波起源于北部。北方潮汐在西部洋脊的浅部发生折射并遭受大量耗散损失，而南方潮汐则向西北偏西方向无阻碍地传播，这导致a波比b波更大且出现更早。结果与以前的观测结果一致，现在可以根据南海东北部内波和潮汐的完整三维结构来理解。
Four current-meter moorings and 12 pressure sensor–equipped inverted echo sounders (PIES) were deployed during summer 2011 in the South China Sea. The goal of the experiment was to obtain synoptic observations of the large-amplitude nonlinear internal waves from the near field to the far field as they propagated west-northwest across the sea. The program was unique because it was the first to observe the latitudinal variability of the wave crests in addition to the transformations along a single east–west transect. The waves were strongest down the center of the PIES array along roughly 20°45′N and were weaker off axis in both directions. Both a-waves and b-waves arrived earlier in the south than the north, but with different lag times indicating different propagation directions and therefore different sources. The waves were classified by their arrival patterns and source locations and not by their amplitude or packet structure. The Stanford Unstructured Nonhydrostatic Terrain-Following Adaptive Navier–Stokes Simulator (SUNTANS) model, calibrated against the array, showed that the a-waves developed out of the internal tide spawned in the southern portion of the Luzon Strait and the b-waves originated in the north. The northern tides were refracted and suffered large dissipative losses over the shallow portion of the western ridge, whereas the southern tides propagated west-northwest unimpeded, which resulted in a-waves that were larger and appeared sooner than the b-waves. The results were consistent with previous observations that can now be understood in light of the full three-dimensional structure of the internal waves and tides in the northeastern South China Sea.