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harmful algal blooms

An orange river flows through a canyon. Colorful stratified mesas rise in the distance beneath a cloudy sky.
Posted inNews

U.S. River Sediment Transport Is Becoming “Burstier”

by Emily Gardner 30 October 20262 November 2026

The time frame in which U.S. rivers move most of their sediment has compressed significantly, which could have implications for water treatment, aquatic habitats, erosion, and harmful algal blooms.

Diatom chains within glass shells shaped like toothpicks
Posted inNews

Wastewater Can Take Harmful Algal Blooms from Bad to Worse

by Lisa S. Gardiner 8 September 20262 November 2026

By modeling toxic diatoms and coastal processes, scientists have discovered the degree to which nutrients from Southern California’s densely populated coast affect these blooms.

A gif of the Earth shows a pattern of red and blue swirling over the tropical Pacific Ocean.
Posted inResearch & Developments

6 Ways This Year’s “Super El Niño” Could Affect Climate, Humans, and Marine Creatures

by Emily Gardner 11 June 202612 June 2026

The key word here is “could.” Experts emphasize that no two El Niños are alike.

A beach in the Florida Keys
Posted inNews

Shallow Injection Imperfectly Filters Florida Wastewater

by Caroline Hasler 26 September 202526 September 2025

Injection of wastewater into shallow wells is meant to filter nutrients like nitrogen and phosphorus out of the wastewater. But a new study suggests that nutrients aren’t entirely eliminated—and may be polluting coastal waters.

Two people on the deck of a boat around sunset reach for an instrument—almost as tall as they are—being raised up over the side of the ship from underwater.
Posted inNews

Cruise to Measure Gulf Dead Zone Faces Stormy Funding Future

by Elise Plunk 5 September 20258 September 2025

Funding cuts are affecting The Pelican’s annual hypoxia cruise to investigate the environmental conditions off the coast of Louisiana.

A satellite image of a river becoming a fan-shaped delta and then draining into the ocean.
Posted inResearch Spotlights

Arctic Rivers Trade Inorganic Nitrogen for Organic

by Saima May Sidik 6 August 20256 August 2025

Climate change is shifting the makeup of a key nutrient in rivers across Russia, Alaska, and Canada, with the potential for ecosystem-wide impacts.

Satellite view of swirling blooms of green algae and cyanobacteria in the Baltic Sea near the Swedish island of Gotland
Posted inFeatures

Could Bubbling Oxygen Revitalize Dying Coastal Seas?

by Caroline P. Slomp and Andreas Oschlies 1 May 20257 May 2025

Reoxygenation approaches have shown some success in lakes, but their potential risks must be examined carefully before they’re implemented as solutions to improve the health of coastal waters.

A river flowing through a forest.
Posted inEditors' Highlights

As the River Flows the Colors Sparkle

by Marguerite A. Xenopoulos 6 August 20245 August 2024

Diving into the science behind river color and its relationship with flow.

A person with a mask on walking through a smog covered parking lot.
Posted inEditors' Vox

OneHealth, Climate Change, and Infectious Microbes

by Antarpreet Jutla, Gabriel Filippelli, Katherine D. McMahon, Susannah G. Tringe, Rita R. Colwell, Helen Nguyen and Michael J. Imperiale 31 January 20249 September 2024

AGU and ASM welcome submissions to a joint special collection focusing on the impacts of climate change and microbes on human well-being.

A red tide washes over a Florida beach.
Posted inFeatures

Florecimientos de algas nocivas: nada bueno, solo lo malo y lo feo

by James E. Silliman 20 July 202320 July 2023

Diversos factores humanos y naturales están generando florecimientos de algas nocivas cada vez más frecuentes y prolongados. Estudios recientes han comenzado a revelar la magnitud del problema y nos informan sobre soluciones potenciales.

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Over a dark blue-green square appear the words Special Report: The State of the Science 1 Year On.

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Airborne Imaging Explores a Mosaic of Thawing Permafrost

10 November 202610 November 2026
Editors' Highlights

Disappearing Moon Craters

9 November 2026
Editors' Vox

Announcing the New AGU Publications Editors-in-Chief Starting in 2027

6 November 20266 November 2026
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