A massive seaweed bloom in the Atlantic is the largest on record for March.

A massive seaweed bloom in the Atlantic is the largest on record for March. The map above shows Sargassum density in the central Atlantic Ocean (including the Caribbean Sea and Gulf of Mexico) for March 2023. Red and orange areas show where Sargassum densities were the highest, in terms of the percent of the pixel covered with the seaweed. The data for the map were developed by scientists at the University of South Florida using data from NASA’s Terra and Aqua satellites. They estimate that the Sargassum belt in March totaled about 13 million tons, a record amount for this time of year.