基于GOCI的渤海海域赤潮监测研究

Study on Red Tide Monitoring in the Bohai Sea Based on GOCI

自2000年以来,渤海海域每年都有赤潮发生,这往往使渤海沿海水域深受其害。世界首个地球同步海洋水色成像仪GOCI在监测渤海海域赤潮的分布和短期运动上具有明显的优势。利用GOCI遥感数据,建立了一个改进型赤潮指数(red tide index)的赤潮反演模型,并且证明了在浑浊水域中描述赤潮的有效性。2014年5月15日、26日和28日的每天8幅RI图像均呈现出赤潮面积先增大后减小的变化,并且使用RI阈值3.8,4和4.2,虽然赤潮面积有所改变,但1 d内相对的变化趋势仍基本保持一致。5月15日、26日和28日赤潮区域叶绿素a浓度均在11:30达到最大值,1 d内赤潮区域叶绿素a浓度的不断变化是引起赤潮的藻类垂直迁移导致的结果,从而导致赤潮1 d内发生明显的变化。因此,GOCI可以有效地进行渤海赤潮的短期和长期运动监测。

Since 2000, there have been red tides every year in the Bohai Sea, which has often adversely affected the coastal waters of the Bohai Sea. The world＇s first Geostationary Ocean Color Imager（GOCI） has a distinct advantage in monitoring the distribution and short-term movement of red tides in the Bohai Sea. Therefore, this paper uses GOCI remote sensing data to establish a red tide inversion model based on an improved red tide index, and proves the validity of the red tide in the turbid waters. On May 15, 26 and 28 of 2014, eight RI images showed the change of increase first and then decrease in the red tide area. Using the RI threshold of 3.8,4 or 4.2, although the area of red tide changed, the relative changes in one day remained consistent. The chlorophyll concentration in the red tide region reached a maximum at 11：30 on May 15, 26 and 30. The change of chlorophyll concentration in one day is the result of the vertical migration of algae in red tides, but the red tide is not positively proportional to the chlorophyll concentration. Therefore, GOCI can effectively carry out the short-term and long-term monitoring of red tides in the Bohai Sea.