EOS/MODIS 遥感资料探测海洋赤潮信息方法

近几年来, 我国沿海赤潮的发生越来越频繁, 已经成为一种常见海洋灾害。它的发生给沿海经济、居民生活和生态系统造成了很大影响。通过分析赤潮水体及其周边水体的光谱特性, 以及赤潮发生期间海水叶绿素a 浓度的变化特点, 提出了利用EOS/ MODIS 通道4 与通道3 的反射率比和通道11 与通道9 的离水辐射率比再结合相关的悬浮泥沙信息提取海水中赤潮信息的方法。利用此方法, 对2002 年6 月15 日和2004 年5 月31 日发生在我国渤海的赤潮进行了信息提取。结果表明此方法可以有效地提取海水中的赤潮信息。

A Method for Detecting Red Tide Information Using EOS/MODIS Data

In recent years,red tides appear to have increased in frequency,intensity and geographic distribution.It has been one of familiar ocean disasters in near shore area of China.It had serious impacts on ecosystem,economic and life of inhabitants of the coast.In this paper,based on comparing the spectrum of red tides and its around water,and analyzing the changing characters of chlorophyll-a concentration in the period of red tide occurring,we developed a method of extracting red tide information with EOS/MODIS data.The method considers the ratio of channel 4 and channel 3 reflectance and the ratio of channel 11 and channel 9 water-leaving radiance,combined with suspended sediments.In 15th June 2002 and 31st May 2004,red tides occurred in Bohai Sea of China.We analyzed the EOS/MODIS data of the Bohai Sea of China using the method during the red tides.Results indicate that the method is useful to retrieval red tides information from the surrounding waters.