In total, the bloom weighs a staggering 20 million tons, according to an international team of scientists.
Macroalgae is a term used to to refer to seaweeds and other large-celled marine algae which can usually be seen with the naked eye.
"We started this research because many coastal areas near the Caribbean Sea and West Africa have been experiencing severe Sargassum beaching events since 2011. Our knowledge on many important questions—such as where the Sargassum comes from, how much there is and can we predict the blooms—is extremely limited," Wang told."That's why we started this research to investigate the large-scale phenomenon with satellite imagery.
However, too much Sargassum can cause ecological and economic problems, particularly when large clumps wash ashore—as has been occurring with more frequency around Atlantic and Caribbean coastlines over the past decade or so. Until about 10 years ago, large Sargassum blooms—which grow and recede over the course of a year—were mostly restricted to the Gulf of Mexico and the Sargasso Sea, a region of the North Atlantic. But in 2011, the amount and geographic extent of the seaweed began to rapidly increase, puzzling scientists—who lacked the data needed to identify a cause for this trend.
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