Characteristics and generations of internal wave in the Sulu Sea inferred from optical satellite images
Characteristics and generations of internal wave in the Sulu Sea inferred from optical satellite images
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从光学卫星图像推断苏禄海内波特征及产生过程
DOI：
10.1007/s00343-020-0046-1
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发表时间：
2020-09
影响因子：
1.6
通讯作者：
Zhang Tao
中科院分区：
文献类型：
--
作者：
Zhang Xudong;Li Xiaofeng;Zhang Tao
利用2016年10月至2019年9月拍摄的中分辨率成像光谱仪（MODIS）和可见光红外成像辐射计套件（VIIRS）图像，研究了苏禄海内波的特征及其产生。卫星观测结果表明，苏禄海低气压主要分布在西部较浅海域，东部较深海域偶有观测。IWs的主要波峰长度在50 ~ 150 km之间，最大波峰长度可达300 km以上。IWs的时间分布分析表明，3月IWs最多，7月最少。进一步分析表明，季节变化主要是由于光学卫星图像的云污染。利用卫星图像对新一代IWs站点进行了分析。利用射线追踪方法在苏禄海西部发现了6个可能的IWs生成点，在苏禄海东部发现了1个IWs生成点。在同一海峡内发现了多个IW源，这可能是由于海峡上的海水流动方向不同所致。分析表明，苏禄海长波波峰是苏禄海群岛各小岛间海峡的综合作用。本文研究了苏禄海东部（121.5°E, 6°N）附近海峡由源自苏禄海群岛的内潮非线性演化而形成的具有长波峰的远生IWs。
Characteristics and generation of internal waves (IWs) in the Sulu Sea are studied using Moderate-Resolution Imaging Spectroradiometer (MODIS) and Visible Infrared Imaging Radiometer Suite (VIIRS) images taken from October 2016 to September 2019. Satellite observations show that IWs in the Sulu Sea mainly located in the shallower western areas with occasional observations in the deeper eastern regions. The dominant length of wave crest (LWC) of IWs is between 50 and 150 km with the largest LWC reaching over 300 km. The analysis of temporal distributions of IWs shows that March has the most IWs and July has the least. Further analysis shows that the seasonal variation is mainly due to the cloud contamination of optical satellite images. New generation sites of IWs are analyzed using satellite images. Six possible generation sites for IWs in the western Sulu Sea and one generation site for IWs in the eastern Sulu Sea are found using the ray-tracing method. Multi IW sources in the same strait are found, which may be due to the seawater fl ow over the strait in diff erent directions. The analysis shows that IWs with long wave crest in the Sulu Sea is a combined eff ort of all straits between small islands in the Sulu Archipelago. Remote generated IWs with long wave crest in the eastern Sulu Sea are studied, which are generated at the straits around (121.5°E, 6°N) by the nonlinear evolution of internal tide originated from the Sulu Archipelago.
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