22 August 2005 New method for detecting red tide algal blooms in high scattering and absorbing waters using satellite ocean color imagery
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Abstract
Accurate detection of highly toxic red tide algal blooms in coastal turbid waters has been challenging with currently existing spectral and bio-optical methods applied to satellite ocean color imagery, mainly because of the eventual interference of absorbing and scattering properties of dissolved organic and particulate inorganic matters with these methods. In the present study, we have presented a new red tide index (RI) technique to effectively identify the highly toxic dinoflagellate Cochlodinium polykrikoides (p) blooms in the Korean South Sea and neighboring waters. The effectiveness of this technique was evaluated using in-situ bio-optical observations and SeaWiFS ocean color imagery acquired during two bloom episodes on 19 September 2000 and 28 September 2003. The findings revealed that chlorophyll-a estimated through the application of OC-4 bio-optical algorithm to the SeaWiFS imagery falsely identified Cochlodinium.p blooms in areas abundance in colored dissolved organic and particulate inorganic matter constituents around coastal areas and river mouths. In contrast, red tide index was found to provide more accurate and comparable spatial Cochlodinium.p patterns consistent with in-situ observations, proving to be the best method for providing improved capability of detecting, predicting and monitoring of Cochlodinium.p bloom dynamics in clear oceanic waters and high scattering and absorbing waters off the Korean coast.
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Yu-Hwan Ahn, Palanisamy Shanmugam, "New method for detecting red tide algal blooms in high scattering and absorbing waters using satellite ocean color imagery", Proc. SPIE 5885, Remote Sensing of the Coastal Oceanic Environment, 58850J (22 August 2005); doi: 10.1117/12.614303; https://doi.org/10.1117/12.614303
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