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首页> 外文会议>International Workshop on Marine Remote Sensing in Northwest Pacific Region; 20041011-12; Beijing(CN) >Remote Sensing of Red-Tide Phenomena in Eastern Asian Waters
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Remote Sensing of Red-Tide Phenomena in Eastern Asian Waters

机译：东亚水域红潮现象的遥感

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Recently, occurrence frequency of red-tide phenomena has been increasing in the eastern Asian Waters, which is considered as a sign of degraded marine environment. Since the red-tide phenomenon sometimes damages local fisheries, its early detection has become an urgent social requirement. Ocean Color satellite remote sensing has been considered as a tool for the red-tide detection. In the present study, we demonstrate its detection capabilities in the eastern Asian Waters. Quantitative evaluation of ocean-color red-tide detection is carried out for the areas of Seto Island Sea, Japan. The reason of aerial selection is well-organized existing red-tide observing systems in the regional seas, which consists of research vessels with public wet-laboratories, reporting systems of volunteer ships, and regular airplane observations by eye detections. Using SeaWiFS ocean-color measurements, daily quality controlled 0.01-degree grided images are produced for 1998-2002. For each grid in the study area, monthly mean nLw spectra are calculated for enhancement of the red-tide phenomena, which is known as visible discoloration of surface water. We define the red-tide phenomena as spectral deviations from the monthly mean nLws, which means that, in in situ sense, the red tide is seen as color changes from the surrounding and usual water color (long-term mean). In Osaka Bay, the red-tide phenomena were detected by comprehensive ship observations. Match-up data set were generated using the classified phenomena (Red-Tide: 19 points, non Red-Tide: 120 points) and SeaWiFS observations. Classification criteria of the satellite spectra are as follows; 1) Existence of spectral peak at 555nm, 2) the spectral gradient of 490-555nm is shaper than that of 443-490nm, and 3) nLws of 443-555nm are smaller than those of monthly mean. Sixteen of 19 red-tide cases are classified as red tide by these criteria (84.2%), and 103 of 120 non Red-Tides cases are properly detected (85.8%). The new satellite detection scheme using the ocean color images is tested against the air plane observations, which can be considered wider snapshots of visual Red-Tide detection. The satellite detection agreed quite well with the air plane one. New procedure using the spectral information of satellite ocean color can be used for eastern Asian waters, which will be discussed in the workshop presentation.
机译：近年来，在东亚水域，赤潮现象的发生频率一直在增加，这被认为是海洋环境恶化的迹象。由于赤潮现象有时会破坏当地的渔业，因此早发现它已成为迫切的社会需求。海洋彩色卫星遥感已被认为是赤潮探测的工具。在本研究中，我们证明了其在东亚水域的探测能力。对日本濑户岛海域进行了海洋红潮检测的定量评估。进行空中选择的原因是在区域海洋中组织良好的现有赤潮观测系统，该系统包括具有公共湿实验室的研究船，志愿船的报告系统以及通过肉眼检测进行的定期飞机观测。使用SeaWiFS海洋颜色测量结果，可以得出1998-2002年每日质量受控的0.01度网格图像。对于研究区域中的每个网格，计算月平均nLw光谱以增强赤潮现象，这被称为地表水的可见变色。我们将赤潮现象定义为与月平均nLws的光谱偏差，这意味着，就地而言，赤潮被视为是周围环境和通常的水彩的颜色变化（长期平均值）。在大阪湾，通过全面的船舶观测发现了赤潮现象。使用分类现象（赤潮：19点，非赤潮：120点）和SeaWiFS观测值生成匹配数据集。卫星频谱的分类标准如下： 1）在555nm处存在光谱峰值，2）490-555nm的光谱梯度比443-490nm的光谱梯度整形，并且3）443-555nm的nLws小于月平均值。根据这些标准，在19个赤潮病例中有16个被归为赤潮（84.2％），在120个非赤潮病例中有103个被正确检测出（85.8％）。使用海洋彩色图像的新卫星检测方案已针对飞机观测数据进行了测试，可以将其视为视觉赤潮检测的较宽快照。卫星探测与一架飞机非常吻合。使用卫星海洋颜色光谱信息的新程序可用于东亚水域，这将在研讨会介绍中进行讨论。

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