Coastal sea surface current observation with GOCI imagery
Coastal sea surface current observation with GOCI imagery
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DOI：
10.1117/12.2030969
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发表时间：
2013-10
期刊：
影响因子：
--
通讯作者：
X. Lou;A. Shi;Huaguo Zhang
中科院分区：
文献类型：
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作者：
X. Lou;A. Shi;Huaguo Zhang
海面水流的测量对于了解海洋过程的动态非常重要，特别是在沿海水域，卫星遥感已用于通过可见光或红外图像获取海面平流速度。然而，卫星遥感由于缺乏动态沿海水域的高时间图像以及频繁的云层覆盖而受到影响。在这项研究中，我们利用地球静止海洋颜色成像仪（GOCI）的测量结果，应用最大互相关（MCC）技术观测了2011年5月29日东海的海面洋流。 2011年5月29日每小时的海洋颜色图像（每天8张图像，从上午8:30到下午15:30）显示了一天中水型的运动和演变，并得出了7个序列海面速度场。结果表明，近岸海域海面水流存在显着的日变化。测量期间平均水流速度为30~40 cm/s，最大速度在上午9:30至10:30之间观测到50~60 cm/s。表面速度的短期变化主要是潮汐引起的水平稀释的结果。这里的案例研究展示了对地静止卫星海洋颜色传感器在揭示沿海水域短期动态方面的独特价值。
Measurements of sea surface currents are important in understanding the dynamic of ocean processes especially in coastal waters, and satellite remote sensing has been used to derive sea surface advective velocities with visible or infrared imagery. Yet satellite remote sensing suffered from lack of high temporal imagery in dynamic coastal waters and from frequent cloud cover. In this study, using measurements from the Geo-stationary Ocean Color Imager (GOCI), we observed the sea surface currents in the East China Sea on 29 May 2011 by applying the Maximum Cross-Correlation (MCC) technique. The hourly ocean color images on 29 May 2011 (8 images per day from 8:30 am to 15:30 pm) showed water pattern movement and evolution through the course of a day, and 7 sequence sea surface velocity fields were derived. The results show that there were significant diurnal changes of the sea surface currents in the coastal waters. The average current velocity was 30~40 cm/s during the measurements, with maximum velocity of 50~60 cm/s observed between 9:30 and 10:30 am. The short-term changes of the surface velocities are mainly a result of the horizontal dilution due to tides. The case study here demonstrates the unique value of a geostationary satellite ocean color sensor in revealing short-term dynamics in coastal waters.