Abstract
The blue tide (so-called Aoshio") is one of the most serious problems in the environment of the semi-enclosed inner bay. The objective of this study is to classify the ocean color under the non-Aoshio and the Aoshio conditions. To grasp the spectral reflectance properties of the Aoshio area and to assess quantitatively the ocean color under the Aoshio condition using CIE (Commission Internationale de l'Eclairage) chromaticity coordinates for remote sensing were tried each to achieve the objective. The spectral reflectance measurement under the non-Aoshio and the Aoshio conditions in the inner side of Tokyo Bay from September, 2010 to October (non-Aoshio: September 1, October 6; Aoshio: September 25) was carried out. As a result, a basic spectral reflectance properties (high reflectance in the wavelength range of 450 - 600 nm, a peak shift of the maximum reflectance from 570 nm to 550 nm or less, and a chromaticity coordinate (x:0.23-0.33, y:0.32-0.38) under the Aoshio condition became clear respectively.
