| 摘要: |
| 为了研究南海北部黑潮入侵对内孤立波生成造成的影响, 本研究在对合成孔径雷达图像处理分析的基础上, 运用二维非静力模式, 对南海北部内孤立波生成以及其对黑潮入侵的响应做了初步的模拟和分析。对4 a(2007～2010年)的合成孔径雷达(SAR)图像统计分析发现, 内波出现频率呈现明显的季节变化。月平均数据表明, 内波出现频率在5月到8月期间较高并在6月达到峰值, 占全年总数的29%;而在11月到次年的2 月份期间出现频率较低并在12月和1月达到最低, 各占全年的0.5%。通过二维、非静力近似数值模拟研究发现: 黑潮入侵引起的平流对吕宋海峡区域内孤立波的激发产生具有明显的影响。具体表现为, 黑潮入侵引起的的西向平均流拉伸了内孤立波波形并加强内孤立波的能量的频散,使得大振幅内孤立波演变成多个分散的波动, 波长变长、振幅变小。敏感性实验通过替换夏季温盐场为冬季温盐场, 对模拟结果并无实质上的影响, 表明冬夏季温盐场的差异并非是SAR 观测内波出现频率呈季节变化的重要因素。 |
| 关键词: 内波 合成孔径雷达图像 二维非静力近似 MITgcm 模式 黑潮 |
| DOI：10.11759/hykx20130325003 |
| 分类号: |
| 基金项目:国家自然科学基金重点项目(41030855) |
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| Effect of the Kuroshio on the generation of internal waves in the Northern South China Sea |
|
GUO Da-quan,SHEN Hui
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| Abstract: |
| In this study, we analyzed the Kuroshio’s effect on the generation of ocean internal waves (IWs) in the northern South China Sea (NSCS). We statistically analyzed IW occurrences in satellite synthetic aperture radar (SAR) images from 2007 to 2010. The monthly SAR-observed IW occurrence frequencies show that the highest frequencies are distributed from May to August and reach a peak in June, with a maximum frequency of 29%. Lowest frequencies are distributed in winter from November through February, with a minimum frequency of 0.5% in both December and January. The intrusion of the Kuroshio into the SCS represents a seasonal variability that matches the IWs occurrence variability well. A 2-D non-hydrostatical model properly simulates the generation of IWs and, with the K-branch current added into the domain, the IWs appear to stretch and the energy of the depression appears to scatter. |
| Key words: internal waves synthetic aperture radar 2 dimensional MITgcm the Kuroshio |
