Red Tide Detection and Chlorophyll-a Concentration Retrieval in Southeast Coast of Brazil
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We evaluated reflectance spectra and spectral features of a red tide event associated with high abundances of Mesodinium rubrum. The bloom was observed on the northern coast of the State of São Paulo between 12 and 25 January 2025, with hyperspectral ocean color satellite images. The diagnostic features of phytoplankton algae were observed near 610 nm and 705 nm, with a peak at 665 nm before decreasing. The Normalized Difference Red Tide (NDRT) was developed to map red tide occurrences. For the Bloom class, NDRT values are approximately 0.90, whereas for the No Bloom class, they range from 0.25 to 0.55. We also estimated chl-a concentration using different models: Normalized Difference Chlorophyll Index (NDCI) (0 – 60 mg/m3), a method based on Two Bands Algorithm (2BDA) (0 – 275 mg/m3), Algae Bloom Monitoring Application (AlgaeMAp) (0 - 1600 mg/m3) and Ocean Color 4 (OC4) (0.35 – 0.65 mg/m3).
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