Abstract
Red tide is a harmful algal bloom (HAB) caused by the dinoflagellate Karenia brevis, which occurs in the Gulf of Mexico (GOM) almost every year. We developed a red tide index (RTI) based on reflectance data from the new Landsat 8 satellite, which has two blue bands that can track the reflectance of carotenoid photopigments present in K. brevis. RTI has a range of 0–100, can be correlated with cell counts of K. brevis from field observations, and can be used to produce red tide maps at 30 m pixel resolution. This is a new method of detecting red tide that can be used in conjunction with the existing coarse spatial resolution MODIS-based daily products to monitor the movement of red tide along the coastlines. This can provide a powerful tool to the public health agencies and government for managing coastal resources and protecting human health.
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