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Remote sensing reflectance [Rrs(λ)] and absorption coefficients of red tides were measured in Isahaya Bay, southwestern Japan, to investigate differences in the optical properties of red tide and non-red tide waters. We defined colored areas of the sea surface, visualized from shipboard, as “red tides”. Peaks of the Rrs(λ) spectra of non-red tide waters were at 565 nm, while those of red tides shifted...
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