Fig. 5

Satellite imagery derived Chl a maps and \({b}_{\mathrm{b}{\mathrm{p}\_}_{\mathrm{index}}}(green)\) maps (a, b) K. mikimotoi blooms from MODIS images and (c, d) P. donghaiense blooms from GOCI images, respectively. The highlighted regions (red rectangles and circles) indicate occurrences of K. mikimotoi and P. donghaiense bloom regions that were recorded by the State Ocean Administration (SOA) and the Bulletin of China Marine Disaster from the Zhejiang Ocean Forecast. The color bar represents the variation of satellite derived Chl a and \({b}_{\mathrm{b}{\mathrm{p}\_}_{\mathrm{index}}}(green)\), respectively. The black pixels indicate area of non-bloom area