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sargassum

A person standing on a boat is overlooking blue water with yellow seaweed on its surface.
Posted inNews

The Northern Sargasso Sea Has Lost Much of Its Namesake Algae

Katherine Kornei, Science Writer by Katherine Kornei 8 January 202612 January 2026

There’s less than a tenth as much Sargassum as there was a few years ago, a shift that may be linked to increasing sea surface temperatures in the Gulf of Mexico.

A boat floats atop an inlet covered in brown Sargassum seaweed.
Posted inNews

Have We Finally Found the Source of the “Sargassum Surge”?

by Sarah Nelson 14 May 202514 May 2025

The complexity of modeling the tropical Atlantic makes identifying the source of the ongoing seaweed blooms difficult.

Posted inFeatures

هل يمكن لغمر الأعشاب البحرية أن يبرّد المناخ؟.

by Saima May Sidik 20 March 202420 March 2024

يمكن للأعشاب البحرية المغمورة أن تخزّن الكربون في قاع المحيط، ولكن يظل من غير الواضح مدى فاعلية هذه الاستراتيجية، وكيف ستؤثر على صحة المحيط.

Fish swim amid long strands of seaweed.
Posted inFeatures

Can Submerging Seaweed Cool the Climate?

by Saima May Sidik 16 January 202420 March 2024

Submerged seaweed can store carbon at the bottom of the ocean, but how effective the strategy will be—and how it will affect ocean health—remains unclear.

Aerial photo of brown seaweed lining an entire stretch of a beach in Barbados
Posted inNews

Saint Lucia Works to Release Itself from Sargassum’s Stranglehold

by Sarah Peter 25 September 20204 January 2024

Nearly 10 years ago, Caribbean beaches experienced a sudden onslaught of Sargassum. Today residents continue to explore ways to mitigate the seaweed’s damage to local health and livelihoods.

Close-up view of Sargassum natans, a seaweed commonly found in the Gulf of Mexico
Posted inResearch Spotlights

Sunlight Stimulates Brown Algae to Release Organic Carbon

Sarah Stanley, Science Writer by Sarah Stanley 2 December 20194 January 2024

Sargassum and other brown algae might be an underappreciated contributor of organic compounds called polyphenols to the open ocean.

Cleaning up Sargassum in the Dominican Republic
Posted inNews

Satellite Data Reveal Growth and Decline of Sargassum

Katherine Kornei, Science Writer by Katherine Kornei 29 July 20194 January 2024

High nutrient levels in 2018 resulted in a nearly 9,000-kilometer belt of Sargassum, a seaweed critical to many marine animals but also a nuisance when it washes up on shorelines, new results reveal.

Tobago 2015 Sargassum beaching
Posted inFeatures

Sargassum Watch Warns of Incoming Seaweed

by C. Hu, B. Murch, B. B. Barnes, M. Wang, J.-P. Maréchal, J. Franks, D. Johnson, B. Lapointe, D. S. Goodwin, J. M. Schell and A. N. S. Siuda 2 September 20164 January 2024

The Sargassum Watch System processes satellite data and feeds results to a Web portal, giving decision makers timely information on seaweed location and warnings for potential beaching events.

A view of a bridge, with the New Orleans skyline visible in the distance between the bridge and the water. A purple tint, a teal curved line representing a river, and the text “#AGU25 coverage from Eos” overlie the photo.

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