| SUN Lina,ZHANG Jie,MENG Junmin. 2019. A study of the spatial-temporal distribution and propagation characteristics of internal waves in the Andaman Sea using MODIS. Acta Oceanologica Sinica, 38(7):121－128 |
| A study of the spatial-temporal distribution and propagation characteristics of internal waves in the Andaman Sea using MODIS |
| 基于光学遥感MODIS的安达曼海内波时空分布与传播特性研究 |
| Received:May 30, 2018 |
| DOI：10.1007/s13131-019-1449-8 |
| Key words:internal waves remote sensing Andaman Sea MODIS |
| 中文关键词: 内波 遥感 安达曼海 MODIS |
| 基金项目:The National Key Research and Development Program of China under contract No. 2017YFC1405102; the National Natural Science Foundation of China under contract No. 61471136; the Global Change and Air-Sea Interaction Program of China under contract No. GASI-02-IND-YGST2-04. |
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| Abstract: |
| This paper describes investigations of the internal waves in the Andaman Sea using Moderate Resolution Imaging Spectroradiometer (MODIS) imagery over the period of June 2010 to May 2016. Results of the spatial and temporal distribution, generation sources and propagation characteristics of internal waves are presented. The statistical analysis shows that internal waves can be observed in almost the entire area of the Andaman Sea. Most internal waves are observed in the northern, central and southern regions of the Andaman Sea. A significant number of internal waves between 7°N and 9°N in the East Indian Ocean are also observed. Internal waves can be observed year-round in the Andaman Sea, while most of internal waves are observed between February and April, with a maximum frequency of 15.03% in March. The seasonal distribution of the internal waves shows that the internal waves have mostly been observed in the dry season (February to April), and fewer internal waves are observed in the rainy season (May to October). The double peak distribution for the occurrence frequency of internal waves is found. With respect to the lunar influence, more internal waves are observed after the spring tide, which implies the spring tide may play an important role in internal wave generation in the Andaman Sea. Generation sources of internal waves are explored based on the propagation characteristics of internal waves. The results indicate that six sources are located between the Andaman Islands and the Nicobar Islands, and one is located in the northern Andaman Sea. Four regions with active internal wave phenomenon in the Andaman Sea were presented during the MODIS survey, and the propagation speed of internal waves calculated based on the semidiurnal generation period is smaller than the results acquired from pairs of the images with short time intervals. |
| 中文摘要: |
| 本文利用2010年6月-2016年5月连续6年的MODIS数据，分析了安达曼海内波的时空分布、发生源和传播特征。研究结果表明，空间上，安达曼海深水小于50m的海域均有内波发生，安达曼海北部、中部和南部海域内波分布较多；东印度洋研究区域北纬7°N-9°N也探测到了较多的内波。时间上，安达曼海一年四季均有内波发生，2月-4月探测到的内波最活跃，其中3月探测到的内波最多，占内波总量的15.03%；雨季遥感探测到的内波较少。整体上，安达曼海的内波时间分布呈双峰结构。农历发生时间统计得，内波多发生在大潮之后，这表明大潮对安达曼海内波的产生具有重要作用。同时，根据内波的传播特征给出了安达曼海的内波发生源地，从安达曼海北部到南部共存在7个内波发生源，其中有6个发生源位于安达曼群岛和尼科巴群岛之间海域，仅有1个发生源地位于安达曼海北部海域。本文进一步给出了安达曼海不同内波发生区的内波特征，发现利用波包距离和半日朝周期计算的内波传播波速要小于基于相邻两幅遥感图像计算得到的速度。 |
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