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beaches, coasts, & shorelines

A satellite view of a portion of Earth shows the planet’s curved horizon at the top of the image. Green and brown landmasses are cut by two large, blue, winding rivers that empty into the ocean in the foreground. Clouds are visible on the edges of the image.
Posted inResearch Spotlights

New River Chemistry Insights May Boost Coastal Ocean Modeling

Sarah Stanley, Science Writer by Sarah Stanley 9 January 20269 January 2026

By more realistically accounting for river inputs, researchers reduced overestimation of the amount of carbon dioxide absorbed by coastal waters.

A blue and white sign depicting large waves approaching a shoreline as a stick figure person runs away is affixed to fencing near the shoreline. Waves crash against rocks in the background.
Posted inOpinions

When Should a Tsunami Not Be Called a Tsunami?

by Diana J. M. Greenslade and Matthew C. Wheeler 8 December 20258 December 2025

It’s time to redefine the term so it more clearly conveys meaningful risks to coastal communities and prompts them to act when needed.

A red horse stands in a marsh, up to its knees, and looks back at the camera.
Posted inNews

What Salty Water Means for Wild Horses

by Rebecca Owen 21 November 202526 November 2025

New research monitors how saltwater intrusion is affecting the behaviors of Shackleford Banks’s wild horses.

Aerial photo of San Francisco Bay.
Posted inEditors' Vox

Echoes From the Past: How Land Reclamation Slowly Modifies Coastal Environments

by Bas van Maren 19 November 202519 November 2025

Reclamation of tide-influenced areas has a large impact on coastal environments through gradual modification of tidal dynamics, erosion, and siltation.

Two people stand atop a grassy oceanside cliff, looking at a chunk of land that’s broken off.
Posted inResearch Spotlights

Lab Setup Mimics Arctic Erosion

by Saima May Sidik 14 November 202514 November 2025

The new methodology gave researchers valuable insights into why Arctic shorelines are crumbling.

Close-up image of a turquoise breaking wave
Posted inNews

Scientists Tune In to the Ocean’s Sound Waves

by Andrew Chapman 16 October 202516 October 2025

A new technique detects inaudible acoustic signals from crashing waves, opening up possibilities for monitoring sea and atmospheric conditions from shore.

A man crouches on the deck of a ship. He is wearing latex gloves and collecting a water sample from a tank.
Posted inNews

Panama’s Coastal Waters Missed Their Annual Cooldown This Year

by Katherine Bourzac 15 October 202515 October 2025

The unprecedented failure of tropical upwelling will likely affect the country’s fisheries. Scientists aren’t certain whether it will happen again next year.

Research scientist Kelly Hondula gathers water samples from submarine groundwater discharge sites along the Hawaiian coast.
Posted inNews

Pinpointing Sewage Seeps in Hawaii

by Anna Napolitano 9 October 20259 October 2025

Cesspools and septic systems, as well as coastal development, put Hawaiian coastal waters at risk of contamination.

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 men in a Zodiac navigate icy waters.
Posted inNews

A Fiber-Optic Cable Eavesdrops on a Calving Glacier

by Carolyn Wilke 22 September 202522 September 2025

A glass thread strung along the bottom of a fjord captured the entire process of calving, from the cracking of ice to the breakup of bergs.

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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.

Features from AGU Publications

Research Spotlights

New River Chemistry Insights May Boost Coastal Ocean Modeling

9 January 20269 January 2026
Editors' Highlights

Central China Water Towers Provide Stable Water Resources Under Change

9 January 20269 January 2026
Editors' Vox

Hydrothermal Circulation and Its Impact on the Earth System

3 December 20253 December 2025
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