| Zhang Xudong,Zhang Jie,Meng Junmin,Fan Chenqing,Wang Jing. 2020. Observation of internal waves with OLCI and SRAL on board Sentinel-3. Acta Oceanologica Sinica, 39(3):56－62 |
| Observation of internal waves with OLCI and SRAL on board Sentinel-3 |
| 基于Sentinel-3载荷OLCI和SRAL数据的内波同步探测研究 |
| Received:October 24, 2018 |
| DOI：10.1007/s13131-019-1510-7 |
| Key words:internal wave Sentinel-3 SAR mode altimeter OLCI |
| 中文关键词: internal wave Sentinel-3 SAR mode altimeter OLCI |
| 基金项目:The National Key R&D Program of China under contract No. 2016YFC1401005; the National Youth Natural Science Foundation of China under contract Nos 41906157 and 61501130; 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-SCS-YGST2-04. |
| Author Name | Affiliation | E-mail | | Zhang Xudong | First Institute of Oceanography, Ministry of Natural Resources, Qingdao 266061, China
College of Information and Engineering, Ocean University of China, Qingdao 266100, China | | | Zhang Jie | First Institute of Oceanography, Ministry of Natural Resources, Qingdao 266061, China | | | Meng Junmin | First Institute of Oceanography, Ministry of Natural Resources, Qingdao 266061, China | mengjm@fio.org.cn | | Fan Chenqing | First Institute of Oceanography, Ministry of Natural Resources, Qingdao 266061, China | | | Wang Jing | College of Information and Engineering, Ocean University of China, Qingdao 266100, China | |
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| Abstract: |
| The ocean and land color instrument (OLCI) and synthetic aperture radar altimeter (SRAL) installed aboard the Sentinel-3 satellite have been in orbit for operational uses. In this study, data collected from Sentinel-3 are used to investigate internal waves in the South China Sea. An internal wave is detected using an OLCI image with a resolution of 300 m, and an analysis was performed with a quasi-synchronous moderate-resolution imaging spectroradiometer (MODIS) image. The opposite characteristics of OLCI and MODIS images of the same internal wave are explained by the critical angle in brightness reversals. The unique observational geometry of the OLCI image and its influence on observations of internal waves are discussed. The distribution of σ0 and sea surface height anomalies (SSHAs) induced by internal waves are studied using SRAL records. The σ0 records of SRAL occasionally show less sensitivity to the modulation of internal waves, which may be attributed to the observational geometry, while SSHAs show obvious variations. The synchronous pairing of OLCI images and SRAL records are analyzed to extract the three-dimensional sea surface signatures induced by internal waves. The analysis demonstrates that the profile of SSHAs in the surface shows an opposite phase to the profiles of internal waves in the ocean. The opposite phase relationship, observed in the remote sensing view, is also confirmed with a laboratory experiment. |
| 中文摘要: |
| Sentinel-3上搭载的海洋和陆地水色载荷（OLCI）以及SAR高度计（SRAL）已经业务化在轨运行。本文利用搜集的Sentinel-3数据开展南海内波的研究。利用分辨率约为300m的OLCI图像探测到南海内波的传播，并且基于准同步的MODIS影像对内波的成像特征进行了分析。从内波光学成像临界角的角度解释了准同步的两景遥感图像上内波亮暗特征相反的原因，讨论了OLCI图像独特的观测几何和对内波观测的影响。利用SAR高度计的数据研究了内波引起的后向散射系数和海面高度异常的变化。高度计后向散射系数对内波的调制偶尔出现低敏感性可能是由于高度计观测角度的原因。高度计的海面高度异常对内波的调制响应较为明显。利用OLCI图像和SAR高度计数据的同步观测提取了内波调制海面的三维信息。从遥感的角度发现了内波导致的海面高度异常与海洋内部内波剖面呈现的“反相”关系。这一结论也在实验室实验中得到了验证。 |
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