| 摘要: |
| 基于2009 年12 月～2010 年4 月南海北部大陆坡上东沙岛以西的一套潜标资料, 分析一个中尺度涡与内波相遇时海水温度的变化特征。根据潜标上的温压记录, 利用功率谱分析, 发现潜标布放处存在周期为20～30 min 的内孤立波及全日和半日周期的内潮; 结合海表面高度异常资料, 描述此处一个中尺度涡的经过过程。利用天文潮大潮发生的时间规律, 推断出中尺度涡与内波的相遇, 从而解释了压力记录的异常变化。根据中尺度涡与内波各自引起的海流流向, 分析在本次观测中两者相遇时的共同作用所引起的海水温度的垂向变化, 即当两者引起的流向相反时, 内波引起的日周期等温线波动由上凸型弧状变为下凹型弧状, 短时震荡由向下振荡变化为向上振荡。 |
| 关键词: 南海北部 内潮 内孤立波 中尺度涡 |
| DOI：10.11759/hykx20121225001 |
| 分类号: |
| 基金项目:海洋公益性行业科研专项经费项目(200905024-5) |
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| Characteristics of encounter between a mesoscale eddy and internal waves in the northern South China Sea |
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| Abstract: |
| Based on the mooring system on the continental shelf break in the west of the Dongsha Island in the northern South China Sea, the characteristics of encounter between a mesoscale eddy(ME) and internal waves(IW) was analyzed. The internal solitary wave with a period of 20—30s and the internal tides with diurnal and semidiurnal period were found. The passing of a mesoscale eddy was depicted from sea level anomaly. The encounter of mesoscale eddy and internal wave was deduced from the time of sprint tide and thereby the abnormal change of pressure was explained. From the directions of currents caused separately by the ME and IW, we can draw a conclusion that when these two directions are opposite, the downward shake of contour of temperature will change to upward shake. |
| Key words: the northern South China Sea internal tides internal solitary wave mesoscale eddy |
