| 摘要: |
| 根据2009 年6 月24 日15 时40 分至25 日16 时40 分“科学一号”考察船在东沙岛东北部陆架上K106 站进行的长达25 h 的X 波段雷达、温度链、声学多普勒流速剖面仪(ADCP)同步观测数据, 在该海域利用Radon 变换技术获取了本次观测到的内孤立波的传播速度。利用该孤立波到达前30 min 的ADCP 流速值, 计算得到内波传播方向上的背景流流速为0.04 m/s。最终得出该孤立波的传播速度为3.04 m/s, 传播方向约为297°。基于同样的处理方法, 求解了本航次中获取的南海东北部陆架处其他站点部分内波的波速信息。南海东北部陆架处内波, 主要向西或西北方向传播。本研究对增进东沙群岛附近内孤立波传播特征的认识, 具有重要意义。 |
| 关键词: X 波段雷达 内波 Radon 变换 |
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| 基金项目:中国科学院海洋环流与波动重点实验室开放基金课题(KLOCAW1205); 江苏高校优势学科海洋科学与技术建设工程专项资助;江苏省科技支撑计划(工业) 项目(BE2010125); 国家海洋公益专项( 201105004); 淮海工学院引进人才基金资助(KQ12002) |
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| Velocity of the internal waves around the Dongsha Islands calculated based on X-band radar |
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| Abstract: |
| One day’s continuous observation from 15:40 on June 24 to 16:40 on June 25, 2009 was made from the R/V Science 1 anchored at position K106 in the vicinity of the continental slope northeast of the Dongsha Islands. The onboard X-band radar, thermistor chains and Acoustic Doppler Current Profilers(ADCP) were obtained during this in situ observation. In this paper, the Radon transform is firstly used to obtain the velocity of the internal soliton wave (ISW) around the Dongsha Islands. Accoring to the current velocity from ADCP during thirty minutes ahead of the arriving of the ISW, the background current speed is calculated as 0.04 m/s in the propagating direction of the ISW. The speed of the ISW is confirmed to be 3.04 m/s, and its propagating diredtion is about 297 degree. The velocity of internal waves at other sampling sites on the northern continental shelf of the South China Sea (SCS) is obtained through the same upside processing method. The internal waves on the northeast continental shelf of SCS translate western or northwestern. This research has provided very important information on internal solitary wave propagation characteristics near the Dongsha Islands. |
| Key words: X-band radar internal waves Radon transform |
