| 南海北部a波和b波的生成与传播特征的数值研究 |
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| 引用本文： | 曾智,陈学恩,袁春鑫,唐声全,迟乐全.南海北部a波和b波的生成与传播特征的数值研究[J].海洋学报(英文版),2019,38(11):20-30. |
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| 作者姓名： | 曾智 陈学恩 袁春鑫 唐声全 迟乐全 |
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| 作者单位： | 中国海洋大学海洋与大气学院, 青岛, 266100,中国海洋大学海洋与大气学院, 青岛, 266100,中国海洋大学海洋与大气学院, 青岛, 266100,中国海洋大学海洋与大气学院, 青岛, 266100,中国海洋大学海洋与大气学院, 青岛, 266100 |
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| 基金项目： | The National Key Research and Development Plan of China under contract No. 2016YFC1401300; the National Natural Science Foundation of China under contract No. 41276008; the Taishan Scholars Program. |
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| 摘 要： | 本文基于真实地形、潮汐的高分辨率三维MITgcm海洋环流模式，对南海北部a波（大振幅波列形式）和b波（孤立子形式）的生成与传播特征进行了数值研究。首先，我们总结和分析了这些波动的生成与传播特征。然后我们计算了吕宋海峡的能量收支。能量的生成在一天内有三个极大值，其中最大值对应a波的生成。吕宋海峡西边界的能通量一天内有两个极大值，较大的那个对应a波的生成而另一个对应b波的生成。我们设计了敏感性试验来探究吕宋海峡东西海脊对a、b波的生成和传播造成的影响。通过对比敏感性实验和标准试验的结果，发现对于a波的生成东海脊必不可少，但西海脊几乎没有影响。西海脊削弱了a波的振幅但未对a波波速造成明显的影响。b波来自于从东海脊生成的扰动信号。西海脊加强了这个扰动信号但减慢了它的传播速度。
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| 关 键 词： | 数值模拟 内孤立波 a波 b波 吕宋海峡 |
| 收稿时间： | 2018/9/19 0:00:00 |
A numerical study of generation and propagation of type-a and type-b internal solitary waves in the northern South China Sea |
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| Zeng Zhi,Chen Xueen,Yuan Chunxin,Tang Shengquan and Chi Lequan.A numerical study of generation and propagation of type-a and type-b internal solitary waves in the northern South China Sea[J].Acta Oceanologica Sinica,2019,38(11):20-30. |
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| Authors: | Zeng Zhi Chen Xueen Yuan Chunxin Tang Shengquan and Chi Lequan |
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| Institution: | College of Oceanic and Atmospheric Sciences, Ocean University of China, Qingdao 266100, China |
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| Abstract: | Numerical simulations based on a high-resolution three-dimensional MIT general circulation model (MITgcm) using realistic topography and tidal forcing are conducted to investigate the generation and propagation of the so-called type-a waves (large-amplitude rank-ordered wave packets) and type-b waves (isolated wave packets) in the northern South China Sea. At first, we summarized and analyzed the generation and propagation characteristics of these waves. Then, energy budget at the Luzon Strait is calculated. Energy generation has three local maxima every day, of which the largest one corresponds to the emergence of the type-a wave. Energy flux at the west boundary of the Luzon Strait shows two local maxima each day. The larger one is consistent with the generation of the type-a wave and the smaller one is in correspondence with the generation of the type-b wave. Sensitivity experiments are designed to explore the role of the east and west ridge of the Luzon Strait on the generation and propagation of the type-a and type-b waves. It is found that the east ridge is indispensable on the generation of the type-a wave while the west ridge has little contribution. The west ridge diminishes the type-a waves'' amplitude but hardly changes their propagation speed. The type-b waves also come from perturbation signals which originate from the east ridge and are enhanced in amplitude and reduced in propagation speed by the west ridge. |
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| Keywords: | numerical simulation|internal solitary wave|type-a wave|type-b wave|Luzon Strait |
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