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El Niño-Southern Oscillation (ENSO)

Two people stand in a recently flooded area of the Grand Canyon.
Posted inResearch & Developments

Why Did the Grand Canyon Flood?

by Emily Gardner 3 September 20263 September 2026

Last weekend, flash flooding in the Grand Canyon killed two, left one missing, and forced dozens to evacuate. On Monday, the National Park Service shared that approximately 40% of the Transcanyon Waterline—the national park’s only water pipeline—had been damaged or destroyed.

两张图表展示了ENSO的不对称性。左侧标有“日变化”的图表显示,海表温度白天高于夜间。右侧标有“ENSO不对称性”的图表包含两条线,横轴为时间,纵轴为温度。两条线在中间达到峰值,但标有“厄尔尼诺”的红色线条峰值高于标有“拉尼娜”的蓝色线条。
Posted inResearch Spotlights

厄尔尼诺的增温效应强于拉尼娜的降温效应。如何准确模拟这种不对称性?

by Nathaniel Scharping 26 August 202626 August 2026

一项新研究分析了海表温度的每日波动,以期获得新的见解。

A satellite view of the Mediterranean and Atlantic Oceans on 13 August 2026. Most of the Mediterranean and about half of the part of the Atlantic visible in the image are red or dark red, indicating hot sea surface temperature anomalies.
Posted inResearch Spotlights

Why Marine Heat Waves and Acidification Strike Together

by Rebecca Dzombak 24 August 202624 August 2026

A chemistry tug-of-war between ocean acidity and carbon in warming oceans determines when and where these damaging events strike.

Two charts show the way that ENSO is asymmetrical. On the left, a chart labeled “Diurnal variation” shows how sea surface temperature is higher during the day than at night. On the right, a chart labeled “ENSO asymmetry” shows two lines, with time on the x axis and temperature on the y axis. Both lines peak in the middle, but the red line labeled “El Niño” has a higher peak than the blue line labeled “La Niña.”
Posted inResearch Spotlights

El Niño Warming Is Stronger Than La Niña Cooling. What’s the Right Way to Model This Asymmetry?

by Nathaniel Scharping 7 July 202626 August 2026

A new study looks at daily swings in sea surface temperatures for new insights.

A capuchin monkey, which has a brown body and a white face, grips the trunk of a narrow tree and looks at the camera with big, sad eyes.
Posted inNews

Climate Extremes May Be Reshaping Monkeys’ Social Structures

by Roberto González 18 June 202618 June 2026

Large groups have their pros and cons. But a changing climate may push them off balance.

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 hurricane on Earth is seen from the International Space Station.
Posted inNews

NOAA Forecasts a Below-Average Hurricane Season

by Emily Gardner 21 May 202617 June 2026

A potentially record-breaking El Niño may reduce the likelihood of storms, but the agency still stressed the importance of preparedness.

A wildfire on a hillside burns at night.
Posted inResearch & Developments

2026 Has Already Broken Climate Records. El Niño Could Break More.

by Grace van Deelen 12 May 202611 May 2026

As the midpoint of the year approaches, several climate records have already been broken. Arctic winter sea ice extent reached a record low. Several countries saw record-breaking winter heat waves. And more than 150 million acres have already burned globally in wildfires.

A wildfire burns in a forest at night.
Posted inNews

Most of the U.S. West Will Face Above-Normal Wildfire Risk This Summer

by Grace van Deelen 11 May 202611 May 2026

The National Interagency Fire Center predicts elevated wildfire potential across much of the West and many Southeast states through August.

The Sun looms large in a red sky over the trees of the Amazon rainforest.
Posted inResearch Spotlights

Drought Drove the Amazon’s 2023 Switch to a Carbon Source

by Madeline Reinsel 25 February 202625 February 2026

The change was caused by thirsty vegetation taking up less carbon than normal, not by the year’s extended fire season, new research shows.

Posts pagination

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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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4 September 20264 September 2026
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Unveiling Atmospheric Circulation on Mars with Magnetic Field Data 

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AGU Launches New Special Collection at the Nexus of Science and Policy

3 September 20263 September 2026
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