Date：2026-03-24

The tropical Pacific Ocean and the frozen expanse of Antarctica sit more than 10,000 kilometers apart. Yet new research shows that when surface waters warm near the equator in northern winter, the Antarctic stratosphere responds months later—a delayed reaction that could improve predictions of Southern Hemisphere climate patterns.

Published in Atmospheric Chemistry and Physics, the study was led by a research team at the Institute of Atmospheric Physics, Chinese Academy of Sciences, in collaboration with the University of Science and Technology of China, Dalhousie University (Canada), and the Bedford Institute of Oceanography (Canada).

The Antarctic stratospheric polar vortex—a massive circulation of cold air swirling high above the continent—plays a crucial role in shaping Southern Hemisphere weather and influencing polar ozone levels. When the vortex weakens, it can disrupt weather patterns across the mid-latitudes and affect the Antarctic ozone hole. But predicting these changes months in advance has proven challenging.

The research team, analyzing climate data from 1980 to 2024, discovered a telling pattern: when sea surface temperatures in the tropical central Pacific (a region known as Niño4) warmed during December–February, the Antarctic stratosphere consistently showed warming and a weakened polar vortex the following July–September.

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