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ENSO

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.

A shallow green-blue river with large brown-gray rocks.
Posted inResearch Spotlights

Droughts Sync Up as the Climate Changes

by Rebecca Owen 18 September 202518 September 2025

A new study reconstructs roughly 800 years of streamflow history in India’s major rivers, showing an increase in synchronous drought linked to anthropogenic climate change.

Bees congregate on a tropical tulip ginger flower.
Posted inNews

El Niño May Be Driving Insect Decline in the Tropics

by Roberto González 15 September 202515 September 2025

Stronger and more frequent El Niño events are contributing to a decline in arthropod diversity and population, as well as to a reduction in the ecological services the animals provide.

A map and graph from the study.
Posted inEditors' Highlights

Tree Rings Record History of Jet Stream-Related Climate Extremes

by Susan Trumbore 20 August 202520 August 2025

Persistent spatial patterns of summer weather extremes in the northern hemisphere recorded in tree ring growth records provide a thousand-year history of jet stream ‘wave5’ dynamics.

4 maps from the study.
Posted inEditors' Highlights

Decadal Forecasts with a SMYLE

by Kristopher B. Karnauskas 13 August 202511 August 2025

Scientists use a large suite of simulations with an established climate model to predict the Pacific Decadal Oscillation up to one year in advance, but El Niño can still get in the way.

Map of the ENSO in the pacific ocean with 2 equations overlain.
Posted inEditors' Vox

Two Equations that Unlock El Niño

by Jérôme Vialard 5 June 20254 June 2025

Despite the El Niño–Southern Oscillation’s global reach and complex ocean–atmosphere interactions across timescales, two simple, elegant equations capture its key dynamics and defining properties.

A satellite image shows a hurricane in the Caribbean Sea.
Posted inNews

Busy Hurricane Season Expected in 2025

by Grace van Deelen 22 May 202522 May 2025

A new NOAA report predicts an active Atlantic hurricane season, though global weather patterns could still shift predictions.

A colorized image of a virus as seen under a microscope, with purple and green in the background and long orange lines dotted with yellow specks.
Posted inResearch Spotlights

The Interplay of ENSO and Immunity in Infectious Disease Outbreaks

Sarah Derouin, Science Writer by Sarah Derouin 7 March 20257 March 2025

El Niño and La Niña events can affect the spread of infectious diseases including cholera and dengue fever. The effects of some diseases may persist over several years.

World map showing sea surface temperature with color.
Posted inEditors' Highlights

Three Studies Point to El Niño as Key to 2023 Record Global Heat

by Kristopher B. Karnauskas 28 January 202528 January 2025

Three recent studies reveal how the interplay between El Niño and long-term global warming drove the record-breaking global temperatures of 2023.

An aerial view of Seoul, South Korea, bathed in orange light at sunrise
Posted inNews

“Exceptional” Global Warming Spike Continued in 2024

Kimberly M. S. Cartier, News Writing and Production Intern for Eos.org by Kimberly M. S. Cartier 10 January 202510 January 2025

More than 3 billion people experienced their hottest year ever in 2024 because of anthropogenic climate change. The world is speeding toward its 1.5°C warming target.

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Features from AGU Publications

Research Spotlights

Understanding Flux, from the Wettest Ecosystems to the Driest

24 November 202524 November 2025
Editors' Highlights

Heatwaves Increase Home Births in India

2 December 20251 December 2025
Editors' Vox

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

19 November 202519 November 2025
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