An unlimited belt of brown seaweed is stretching throughout the Atlantic Ocean, from the coast of West Africa to the Gulf of Mexico, making a phenomenon so in depth that it may be tracked from house. Often known as the Nice Atlantic Sargassum Belt (GASB), it has reached extraordinary proportions in 2026, about 5,000 miles in size.Satellite tv for pc measurements confirmed 37.5 million metric tons of sargassum throughout the Atlantic in Might, whereas researchers on the College of South Florida (USF) recorded 33.6 million metric tons throughout the monitored Atlantic basin in June. They now count on 2026 to be not less than the second-biggest 12 months on report.The transformation has been remarkably quick. The big belt was just about nonexistent earlier than 2010. Inside a 12 months, about 1 million metric tons have been recorded throughout the area in 2011, in contrast with roughly 40 million in 2025. Brian Barnes, a analysis assistant professor at USF’s Faculty of Marine Science, instructed Reuters that the development suggests the quantity might be doubling roughly each 5 years.
What’s sargassum and why is it spreading?
Sargassum is a brown seaweed that naturally kinds floating mats and has lengthy been related to the Sargasso Sea within the North Atlantic. Round 2010, extraordinarily sturdy winds carried it into tropical waters off West Africa, the place it was met with beneficial rising circumstances. Constant ocean currents then helped set up the recurring belt extending in direction of northern South America, the Caribbean and the Gulf of Mexico. Sargassum requires vitamins, significantly nitrogen and phosphorus. Scientists imagine its progress is being supported by a number of sources, together with materials carried into the Atlantic by the Amazon, Orinoco and Congo rivers, vitamins rising from deeper ocean waters and Saharan mud. Hotter ocean temperatures may be serving to create beneficial circumstances. Earlier analysis discovered that the nitrogen content material of sargassum elevated by 55% between the Nineteen Eighties and 2010s, whereas its nitrogen-to-phosphorus ratio rose by round 50%.Sargassum itself performs an essential ecological function. Floating mats present habitat for fish, turtles and quite a few different marine species. Issues come up when enormous portions attain the coast and start decomposing. The seaweed releases hydrogen sulfide, a poisonous fuel accountable for its distinctive rotten-egg odor. Giant accumulations can even scale back oxygen ranges in coastal waters, harm coral reefs and launch methane.
File quantities reaching the Caribbean
The results of this progress and unfold are more and more seen alongside the Caribbean coastlines. Round 1 million metric tons of sargassum have been already current within the western Caribbean in January, roughly 10 instances the standard quantity for that month. By June, USF researchers have been describing Caribbean ranges as report excessive.Mexico particularly has been having a troublesome season. By late July, authorities had collected roughly 100,000 metric tons of sargassum in 2026, already surpassing the roughly 92,783 metric tons eliminated throughout the entire of final 12 months.A round the clock defence is underway towards the invasion within the nation’s tourism hub, together with boats, boundaries and handbook seaside cleansing groups. An AFP workforce travelled by means of the Riviera Maya and Tulum aboard one of many 27 specialised ships the Mexican Navy has used since 2019 to comprise the proliferation of sargassum, a sort of algae with tiny berry-like sacs permitting it to drift, that began arriving in 2011. The boat strikes as if by means of a online game, trying to find concentrations of the weeds to suck up. A ramp constructed into the prow makes use of a mechanical belt to scoop the sargassum off the floor of the water, bringing it right into a chute contained in the boat.Efforts to scoop up sargassum are carried out on the excessive seas with a ship that may carry 300 tons of the seaweed, in addition to smaller boats and amphibious automobiles. The ultimate tactic entails gathering the brown algae by hand.
A loss for Mexican tourism
Whereas operations to weed out the seaweed are ongoing, sargassum has nonetheless managed to succeed in quite a few seashores of the Mexican Caribbean, the place vacationers do not need to sunbathe or swim whereas enveloped within the stench of rotting eggs.
Whereas operations to weed out the seaweed are ongoing, sargassum has nonetheless managed to succeed in quite a few seashores of the Mexican Caribbean, the place vacationers do not need to sunbathe or swim whereas enveloped within the stench of rotting eggs. Companies have lowered their employees to regulate to the drop in tourism. Azul Lucero, a 26-year-old Argentine waitress who works in Playa del Carmen, the place she makes the vast majority of her earnings off suggestions, mentioned her restaurant “would not have over 50” prospects a day, as per a report by Gulf At the moment. Usually, that quantity is nearer to 400 when the ocean is clear and clear.The federal government insists that overseas vacationers are arriving in report numbers, though President Claudia Sheinbaum acknowledged a slight drop when she unveiled an formidable joint technique between the federal government and lodge business to struggle the weedy invasion.“There have not been main losses,” she added, attributing the shift to the value of aircraft gasoline. Resort occupancy this summer time has floated between 55 per cent and 70 per cent relying on the vacation spot, whereas the high-season common reached as much as 90 per cent 15 years in the past, based on business statistics. Close to one mountain of sargassum is the Playa del Carmen lodge the place Tere Might, 47, works as a chef, however she complained that the “insufferable stench” was protecting all 24 rooms empty.“There may be nothing proper now,” she mentioned. The sargassum “has affected all the things.” Bianca Ibanez, 33, had come to spend a couple of days of trip along with her household however was shocked by the sheer amount of seaweed on the seaside. “You’ll be able to’t actually get pleasure from issues,” she mentioned.Chuanmin Hu, distinguished college professor of optical oceanography on the College of South Florida (USF), mentioned the warning indicators appeared unusually early. “The first motive [for the large amount of sargassum] is that this 12 months, the western Caribbean, together with the Mexican coast, began excessive: about 1 million metric tons of sargassum in January, about 10 instances the everyday quantity for that month.”As of now, scientists count on circumstances alongside Mexico’s Caribbean coast to enhance considerably by late October or early November. However a long-term resolution remains to be unclear.
